Genotype Interaction Research Articles

Agroecological genetics of biomass allocation in wheat uncovers genotype interactions with canopy shade and plant size.

How plants distribute biomass among organs influences resource acquisition, reproduction and plant-plant interactions, and is essential in understanding plant ecology, evolution, and yield production in agriculture. However, the genetic mechanisms regulating allocation responses to the environment are largely unknown. We studied recombinant lines of wheat (Triticum spp.) grown as single plants under sunlight and simulated canopy shade to investigate genotype-by-environment interactions in biomass allocation to the leaves, stems, spikes, and grains. Size-corrected mass fractions and allometric slopes were employed to dissect allocation responses to light limitation and plant size. Size adjustments revealed light-responsive alleles associated with adaptation to the crop environment. Combined with an allometric approach, we demonstrated that polymorphism in the DELLA protein is associated with the response to shade and size. While a gibberellin-sensitive allelic effect on stem allocation was amplified when plants were shaded, size-dependent effects of this allele drive allocation to reproduction, suggesting that the ontogenetic trajectory of the plant affects the consequences of shade responses for allocation. Our approach provides a basis for exploring the genetic determinants underlying investment strategies in the face of different resource constraints and will be useful in predicting social behaviours of individuals in a crop community.

Predicting factors of survival rates among alpha- and beta-thalassemia patients: a retrospective 10-year data analysis

BackgroundThalassemia is a genetic hemoglobinopathy in which a defective globin chain can cause transfusion-dependent anemia and other complications. As genotype interactions lead to variations in the clinical course among patients with thalassemia, clinical factors may help predict survival in the types of thalassemia complicated by gene interactions.AimThis study aimed to determine the clinical factors associated with survival in patients with thalassemia. We retrospectively reviewed the medical records of patients with thalassemia older than 15 years between 2002 and 2020 that were available at the Rajavithi Hospital. Data on the clinical parameters, laboratory tests, treatments, and survival status were collected and analyzed.ResultsOf the 478 thalassemia patients included, 68.8% were women, and the mean age was 41 ± 17 years. The most common type of thalassemia was β-thalassemia (53.3%). Male sex, low body mass index, the thalassemia type, comorbidities, low hemoglobin level, high ferritin level, and regular blood transfusion were significantly associated with short-term survival. However, only the thalassemia type (β-thalassemia, p = 0.048) and the co-inheritance of the α- and β-thalassemia genotypes (p = 0.03) were independently associated with death. The overall survival rates among patients with α-thalassemia, β-thalassemia, and co-inheritance of the α- and β-thalassemia genotypes were 98.1%, 90.6%, and 75.0%, respectively. The death rate was 6.3%, and the most common cause of death was infection.ConclusionThe thalassemia genotype was a predictive factor of survival, and co-inheritance of the α- and β-thalassemia genotypes results in a shorter-term survival compared with other types, especially transfusion-dependent thalassemia. These results can be applied in clinical settings to predict and possibly extend the life expectancy of patients with thalassemia.

The role of oxytocin receptor gene variants in appetitive aggression: A study in a South African male sample

AbstractChronic exposure to trauma and violence can promote aggressive behavior. Oxytocin and variants in the oxytocin receptor (OXTR) gene may play a role in the etiology of proactive, that is, goal‐oriented instrumental aggression, or reactive aggression, which typically occurs in response to emotionally triggering situations. The current study builds on previous findings that experienced and witnessed trauma in childhood predicts higher levels of appetitive aggression, a form of proactive aggression characterized by the enjoyment of participating in violent behavior. The current study explores the role of OXTR rs2254298 and rs53576 variants in appetitive and reactive aggression. Adult males living in Cape Town, South Africa, and at risk for violent behavior completed the Appetitive Aggression Scale (AAS) and Buss–Perry Aggression Questionnaire (BPAQ). OXTR rs2254298 and rs53576 were successfully genotyped via restriction fragment length polymorphism (RFLP) analysis in 238 and 239 participants, respectively. Regression analysis showed that rs2254298 G/G and A/G genotypes and the rs53576 A/G genotype were significantly associated with lower AAS scores (p < .001) compared to the A/A genotype. Additionally, genotype interaction analyses conducted in 232 participants, found that the combination of rs2254298 A/G and rs53576 G/G genotypes produced opposite effects on appetitive and reactive aggression. Specifically, this combination was associated with a 0.29‐point increase in AAS scores (p = .032) and a 0.13‐point decrease in BPAQ scores (p = .037) when compared to A‐allele homozygosity for both variants. These results suggest that genetic variation in a signaling system involved in influencing environmental and social salience may contribute to appetitive aggression.

Variance analysis and heritability estimation of growth and yield parameter of sweet cassava promising clones in two environments

Planting a good variety is important thing in increasing the productivity of cassava’s productivity. Selection and evaluation are needed for development of new variety. The evaluations were done in Malang (Entisol soil) and Probolinggo (Alfisol soil). The evaluation used an RCBD with three replications. Plants were planted on rows with distance 100 cm between rows and 80 cm within rows. Twelve clones (8 promising clones and four released variety) were used in this evaluation. Results can be seen that the variance of genotype was bigger than the variance of genotype x environment interaction for fresh tuber yield, starch content, long of tuber, diameter of tuber, tuber number/plant in eight months and plant height in 4 months, means genetic potency of clones tested more important compared to effect of genotype x environment interaction. This result indicated that clone tested have low chance to be a specific adaptation. The genotypic variance and the heritability for fresh tuber yield, diameter of tuber and tuber number/plant in eight months in Malang were higher than that in Probolinggo.

Understanding the Molecular Regulatory Networks of Seed Size in Soybean.

Soybean being a major cash crop provides half of the vegetable oil and a quarter of the plant proteins to the global population. Seed size traits are the most important agronomic traits determining the soybean yield. These are complex traits governed by polygenes with low heritability as well as are highly influenced by the environment as well as by genotype x environment interactions. Although, extensive efforts have been made to unravel the genetic basis and molecular mechanism of seed size in soybean. But most of these efforts were majorly limited to QTL identification, and only a few genes for seed size were isolated and their molecular mechanism was elucidated. Hence, elucidating the detailed molecular regulatory networks controlling seed size in soybeans has been an important area of research in soybeans from the past decades. This paper describes the current progress of genetic architecture, molecular mechanisms, and regulatory networks for seed sizes of soybeans. Additionally, the main problems and bottlenecks/challenges soybean researchers currently face in seed size research are also discussed. This review summarizes the comprehensive and systematic information to the soybean researchers regarding the molecular understanding of seed size in soybeans and will help future research work on seed size in soybeans.

Unravelling the dynamics of genotype and environment interactions on chilli (Capsicum annuum L.) yield-related attributes in soilless planting systems

Evaluation of genotypes to identify high-yielding and stable varieties is crucial for chilli production sustainability and food security. These analyses are essential, particularly when the breeding program aims to select lines with great adaptability and stability. Thirty chilli genotypes were evaluated for yield stability under four soilless planting systems viz; fertigation, HydroStock (commercial hydrogel), BioHydrogel (biodegradable hydrogel), and hydroponic to study the influence of genotype by environment interaction. The research used a split-plot randomized complete block design (RCBD) with two cropping cycles and five replications. The GGE biplot analysis was employed to assess the mean versus stability perspective in explaining the variation in genotypic and genotype-by-environment effects on the yield-related attributes for yield per plant, fruit number, fruit length, and width. Stability analysis denoted genotypes G26 and G30 as the most stable for yield per plant, while G16, G22, and G30 were stable for the number of fruits per plant. Among the four planting systems evaluated, HydroStock and BioHydrogel outperformed the others in yield per plant, demonstrating the highest level of informativeness or discrimination. These findings offer critical insights for future crop breeding programs and the optimization of agricultural practices.

The HINT1 Gene rs2526303 Polymorphism and Its Association with Personality Traits in Cigarette Smokers.

The development of a substance use disorder (SUD) is a multifaceted process influenced by both genetic and environmental factors. Recent research has suggested the potential involvement of the HINT1 gene in various aspects of plasticity, mood regulation, anxiety-like behaviour, and stress-coping mechanisms. Moreover, personality traits are also recognised to be instrumental in developing substance dependency. Given these considerations, our study investigated the associations among cigarette smoking, personality traits, and the rs2526303 polymorphism. Additionally, we investigated the interactions between personality traits and rs2526303 in the HINT1 gene. The study group comprised 531 volunteers: 375 cigarette users (mean age = 29.42 ± 10.72; F = 49%, M = 51%) and 156 never-smokers (mean age = 26.93 ± 10.09; F = 79%, M = 21%). Genotyping was conducted using the real-time PCR method, and the NEO Five-Factor Personality Inventory and State-Trait Anxiety Inventory were administered. There were no statistically significant differences in the frequency of rs2526303 genotypes and alleles in the cigarette user group compared to the control group. Compared to the control group, the cigarette users obtained higher scores in the assessment of the NEO-FFI Extraversion scale and lower results for the NEO-FFI Openness, Agreeableness, and Conscientiousness scales. Additionally, there was a statistically significant effect of rs2526303 genotype interaction and cigarette-using status on the conscientiousness scale. These outcomes collectively suggest a notable association between cigarette smoking and specific dimensions of personality, particularly highlighting differences in extraversion, openness, agreeableness, and conscientiousness. Furthermore, the detected interaction effect involving rs2526303 concerning conscientiousness signifies a complex interplay between genetic factors and smoking behaviour.

Yield related traits in some Persian walnut cultivars: Analysis of genetic and genetic by environment interaction

The most important trait in tree species, including walnut, is the yield. In this study, the effect of genotype and their interaction with year on Nut weight, Kernel weight, Kernel percentage, Fruit set, Nuts number on Scaffold (Canopy) Cross Area (SCA), Nut weight on SCA and Kernel weight on SCA were evaluated on Caspian, Persia, Alvand, and Chaldoran walnut cultivars. The results showed that the effects of year, genotype, and year × genotype interaction on all traits were significant. The results showed that Alvand had the highest number of nuts (41.8 per m2) and nut weight (472.1 g/m2) on (SCA). Heritability (H2b) for kernel weight and kernel percentage, were estimated 0.75 and 0.80, respectively. The lowest value of H2b (0.36) was belong to fruit set. The analyses of genetic and phenotypic correlations between traits showed that, the nut weight had (rg = 0.31, rp = 0.27) a moderate correlation with SCA same as kernel weight (rg = 0.34, rp = 0.29). The GGE biplot analysis explained most of the existing variations (>90%). The genetic effect (PC1) for all traits were higher respect to the genetic × environment interaction (PC2), especially for the kernel percentage (94.4%) and number and weight of nut and kernel on SCA (>90%). The lowest value of the PC1 was related to the fruit set (65.6%), which indicates the trait was more affected by genetic × environment interactions (21.8%). So, this result showed that the yield-related traits in walnut is highly relevant to environment(year in this study) and evaluation of the new cultivars needs careful attention in this case.

Interpreting the Interaction of Genotype with Environmental Factors in Barley Using Partial Least Squares Regression Model

Genotype by environment interaction (GEI) is a complex problem that complicates the barley selection and breeding process. The knowledge of the relationship between cereal phenology and climatic data is important for understanding GEI and the physiological pathways responsible for the interaction effect. The grain yield of twenty winter barley genotypes in six environments was observed. Factors influencing the variability were analyzed using a linear mixed model. The partial least squares regression (PLSR) model was applied to determine the most relevant environmental variables in certain stages of development that explained GEI effects. Biplot with environmental variables explained 43.7% of the GEI. The barley was generally the most sensitive to the environmental conditions (relative humidity, maximum temperature and its variation, sun hours, and precipitation) during the anthesis and filling stage (May) which caused GEI. Temperature variables did not show significance only in the vegetative phase. Different genotypes responded differently to environmental factors. Genotypes NS-525, NS-589, and J-103 were highlighted as widely adaptable, and Zaječar was a suitable and reliable location for yield testing. The GEI information presented in this paper can be useful in traditional plant breeding and future breeding programs through molecular research of crop developmental genes and examination of physiological processes in two-row barley.

Dissecting the resilience of barley genotypes under multiple adverse environmental conditions

As climate change increases abiotic stresses like drought and heat, evaluating barley performance under such conditions is critical for maintaining productivity. To assess how barley performs under normal conditions, drought, and heat stress, 29 different varieties were examined, considering agronomic, physiological, and disease-related characteristics. The research was conducted in five environments: two normal environments in 2020/2021 and 2021/2022, two drought stress environments in 2020/2021 and 2021/2022, and one heat stress environment in 2021/2022. The results demonstrated that genotype and environment significantly influenced all traits (p < 0.05), except canopy temperature, while genotype x environment interaction significantly influenced most traits, except total chlorophyll content and canopy temperature. Heat and drought stress environments often resulted in reduced performance for traits like plant height, spike length, grains per spike, and 100-grain weight compared to normal conditions. Based on individual traits, genotypes 07UT-44, 06WA-77, 08AB-09, and 07N6-57 exhibited the highest grain yield (4.1, 3.6, 3.6, and 3.6 t/ha, respectively). Also, these genotypes demonstrated enhanced stability in diverse drought and heat stress conditions, as assessed by the mean performance vs. stability index (Weighted Average of Absolute Scores, WAASB). The multi-trait stability index (MTSI) identified 07UT-44, 07UT-55, 07UT-71, and 08AB-09 as the most stable genotypes in terms of the performance of all traits. The imported lines demonstrated superior performance and stability, highlighting their potential as valuable genetic resources for developing climate-resilient barley.

Evaluation of promising lines of spring barley in the conditions of the Northern Trans-Urals

This article presents data on the results of a long-term study of promising lines of spring barley in the Tyumen region. The experiment was conducted in 2019-2022 at the experimental field of SRIA (Russia) using generally accepted methods of analysis and standard techniques. 56 samples were evaluated, including 36 of them evaluated by two precursors (peas and spring grains). The analysis of the data showed a decrease in yield according to the predecessor – cereals, without fertilizers by 14.8%. The growing conditions significantly influenced the grain nature, hoodness, protein and fat content (the share of influence was 85.8, 60.9, 55.5 and 72.7%, respectively). The weight of 1000 grains largely depended on varietal characteristics (the share of influence was 63.1%). The formation of starch was significantly influenced by the interaction of genotype and environment (the share of influence was 71.6%, respectively). As a result of the breeding material evaluation, 17 promising samples of spring barley, including four huskless ones, were identified.

Association of 5-HTTLPR With Post-Traumatic Stress Disorder in US Service Members

Objective Post-traumatic stress disorder (PTSD) is a mental disorder that manifests after exposure to a stressful traumatic event, such as combat experience. Accumulated evidence indicates an important genetic influence in the development of PTSD. The serotonin transporter (5-HTT) gene has been identified as a candidate for PTSD and a polymorphism of the serotonin transporter-linked promoter region (5-HTTLPR) is associated with the disorder in the general population. However, whether it is associated with PTSD in active military service members has not been investigated. This study aimed to investigate the relationship between 5-HTTLPR and PTSD in service members. Methods Leucocyte genomic DNA was extracted from service members, including those with PTSD (n = 134) or without PTSD (n = 639). The 5-HTTLPR polymorphism was detected by means of 2 stages of TaqMan fluorescent PCR assay. PTSD symptoms and symptom severity were assessed using the PTSD Checklist (PCL), a 17-item, DSM-based, self-report questionnaire with well-established validity and reliability. PTSD was determined based on endorsement of DSM-IV criteria and a PCL total score ≥ 44. Results Significant differences in biallele distribution were observed between PTSD and controls (χ2 = 7.497, P = .024). The frequency of SS, SL, and LL genotypes in the PTSD group was 0.17, 0.56, and 0.27 respectively, compared to the frequencies of 0.27, 0.43, and 0.29 in non-PTSD controls. Carriers of the L allele had higher scores for reexperiencing and arousal symptoms on the PCL, compared to SS homozygote carriers (P < .05). The triallele genotypes showed no significant differences in distribution between the PTSD and control groups (P > .05) and no relationship with PTSD symptom severity. The interaction of triallelic genotypes of 5-HTTLPR and traumatic life events was associated with re-experiencing, avoidance, and arousal (P < .05 for all). Multiple regression analysis revealed significant correlations between both biallelic and triallelic genotypes of 5-HTTLPR, the interaction of the number of stressful lifetime events, and 5-HTTLPR genotypes with PCL total score (P < .001). Conclusion Our findings suggested that 5-HTT might play a minor role in PTSD, and the interaction between 5-HTTLPR and the environment had effects on PCL score, complementing and emphasizing 5-HTT for PTSD, especially in the military population.

Wheat cultivars grain yield and quality traits variability under conditions of southern Pannonian plain

In order to meet milling industry and grain producers' requirements, wheat grain needs to possess good technological quality, and high and stable grain production. This study analyzed 30 varieties of winter wheat over four growing seasons (2015/16, 2016/17, 2017/18, and 2018/19) at the location Rimski Šančevi, Serbia. The studied traits were under the control of genotype, environment, and their interaction. The analysis of variance (ANOVA) revealed that the influence of the factors varied depending on the studied trait. Thousand grain weight showed the highest variability depending on genotype influence, protein content and sedimentation value that were mostly affected by environmental conditions, while the genotype and environment interaction had the greatest impact on hectoliter weight and grain yield. Using principal component analysis significant positive relationship was observed between protein content and sedimentation value, and between thousand grain weight and hectoliter weight. It was also shown that yield and thousand grain weight, sedimentation value and hectoliter weight are positively related. A strong negative association was noted between grain yield and protein content. The protein content and hectoliter weight did not show any dependency. All analyzed traits are significant for breeding programs, emphasizing the importance of developing high-quality varieties with high yield potential and tolerance to adverse environmental conditions.

Adaptabilidade e estabilidade de genótipos de aveia-preta com uso da análise GGE biplot

Abstract The objective of this work was to identify the most adapted and stable genotypes for dry mass and seed yield using the genotype plus environment interaction (GGE) biplot technique. The experiment was conducted in the municipality of Frederico Westphalen, in the state of Rio Grande do Sul, Brazil, in 2018, 2019, 2020, and 2021, using five lines and two cultivars of black oat, in a randomized complete block experimental design, with three replicates. The adaptability and stability of the genotypes, as well as their behavior in the environments, were evaluated using the GGE biplot. The seed yield of black oat genotypes is highly influenced by the environmental conditions over the four studied cultivation years. The UFSMFW 2-07 genotype stands out, but shows instability. The UFSMFW 2-07 and 'UPFA 21-Moreninha' genotypes show adaptability in specific years. Mega environments are formed for the dry mass trait in 2018 and 2021 and seed yield in 2018, 2020, and 2021, whereas, 2019 is considered the year for genotype discrimination.

Avaliação precoce da interação genótipo x safras na cultura da mandioca sob déficit hídrico

ABSTRACT The aim of this study was to evaluate the effect of genotype x harvest interactions on different agronomic traits, the genetic correlation between traits in early selection under water stress, and early selection in cassava. 25 cassava genotypes were evaluated in a randomized block experimental design with four replications. The variables root weight (RW), root number per plant (RN), root diameter (RD), root length (RL), root dry matter content (DMC), stem number per plant (SN), plant height (PH), stem diameter (SD), mite severity (MS), and harvest index (HI) were evaluated under water stress conditions in two harvests. Broad-sense heritability (h²), realized heritability ( ( h R 2 )), and the index of coincidence (IC) were estimated. Accuracy estimates ranged from 0.62 for RL to 0.86 for DMC. A significant genotype effect was identified on all traits, except for RW, RL and SD. Significant genotype x harvest interactions occurred for the variables SN, PH, SD, and HI. (h²) estimates ranged from 0.27 for RL to 0.79 for SN. The estimates of the index of coincidence ranged from 100% to 25%. A positive correlation was observed between all variables under study, except for MS, RN and SN, and the other traits. The genotypes showed similar performance in the two harvests for most variables, except for SN, PH, SD, and HI.

Genotype X Traits Analysis of Gerbera (Gerbera jamensoii) Varieties for Vegetative Traits by Biplots

Recent ten genotypes of gerbera were evaluated for vegetative traits during the year 2022-23 to determine genetic variability, heritability and genetic advance for 15 quantitative traits. Analysis of variance showed significant differences among genotypes for all the characters studied. Results revealed that magnitude of the Phenotypic Coefficient of Variation (PCV) was higher than Genotypic Coefficient of Variation (GCV) for all the traits, indicating greater genotype and environment interaction. High PCV and GCV were observed for number of leaves/plant and leaf width. In the present study bud initiation, plant spread after 100 days of panting, plant height after 45 days of planning showed the high heritability along with maximum genetic gain. Number of leaves (45 days) had maintained only positive correlation with the considered vegetative traits. Leaf length (45 days) exhibited showed direct relationship with plant height (45 days) and leaf length(100 days) while negative relation of plant spread (45 days) with leaf length (100 days) and days to bud initiation. Path coefficient analysis showed, plant spread (0.976) had highest positive effect on fresh weight of flowers followed by leaf length (0.824), number of leaves per plant (0.20) while negative effect of plant height (45 and 100 days), days to bud initiation, leaf length (100 days). Performance of Intense, Stanza, Brillance would be unstable type as compared to Golian and Dana Ellen as placed near to the origin of biplot analysis in the present study based on vegetative traits in biplot analysis. Next cluster in same quadrant was comprised of leaf length, leaf width, plant height at 45 days of planting. First cluster of other quadrant comprised of leaf length, leaf width, plant spread at 100 days of planting and last cluster of days to bud initiation with fresh weight of flowers formed across the quadrants.

Linking alcohol use to Alzheimer's disease: Interactions with aging and APOE along immune pathways.

Although it is known that APOE genotype is the strongest genetic risk factor for late-onset Alzheimer's disease, development is a multifactorial process. Alcohol use is a contributor to the epidemic of Alzheimer's disease and related dementias in the US and globally, yet mechanisms are not fully understood. Carriers of the APOE ε4 allele show elevated risk of dementia in relation to several lifestyle factors, including alcohol use. In this review, we describe how alcohol interacts with APOE genotype and aging with potential implications for Alzheimer's disease promotion. Age-related immune senescence and "inflammaging" (i.e., low-grade inflammation associated with aging) are increasingly recognized as contributors to age-related disease. We focus on three immune pathways that are likely contributors to Alzheimer's disease development, centering on alcohol and APOE genotype interactions, specifically: 1) microbial translocation and immune activation, 2) the senescence associated secretory phenotype, and 3) neuroinflammation. First, microbial translocation, the unphysiological movement of gut products into systemic circulation, elicits a proinflammatory response and increases with aging, with proposed links to Alzheimer's disease. Second, the senescence associated secretory phenotype is a set of intercellular signaling factors, e.g., proinflammatory cytokines and chemokines, growth regulators, and proteases, that drives cellular aging when senescent cells remain metabolically active. The senescence associated secretory phenotype can drive development of aging-diseases such as Alzheimer's disease. Third, neuroinflammation occurs via numerous mechanisms such as microglial activation and is gaining recognition as an etiological factor in the development of Alzheimer's disease. This review focuses on interactions of alcohol with APOE genotype and aging along these three pathways that may promote Alzheimer's disease. Further research on these processes may inform development of strategies to prevent onset and progression of Alzheimer's disease and to delay associated cognitive decline.

Genotype and environment interactions of yield contributing characters of field mustard (Brassica rapa L.)

Genotype-environment interaction is the norm of reciprocal action that determines the relationship between gene and environmental factors. Gene and environment interaction takes place when different environments affect the genotypes and vice versa. The investigation portrays the interaction between genes and environments of yield contributing characteristics of eleven genotypes of field mustard. Three seeding-time environments, viz., early, late, and very late of eleven mustard genotypes were laid out with three replications in a randomized complete block design. Among the three environments, which one was favorable and which was not was determined by their significant differences through a combined analysis of variance. The IPCA 1 (first interaction principal component axis) score of genotypes in the AMMI (additive main effects and multiplicative interaction analysis) of G×E interactions was estimated as an indication of the ability to respond to the environments and the performance with changing environments of the genotypes. Considering all the scores, Sonali Sharisha (SS-75), and BINA Sharisha-10 were found to be highly stable genotypes, while among the three environments, the environment-1 (early sowing) was found the best sowing time for raising and harvesting a good mustard crop. Bangladesh J. Bot. 52(4): 1055-1065, 2023 (December)

Stability analysis in rice landraces grown under dry Direct seeded condition

In the present study the genotype x environment interaction and stability performances of 15 rice landraces in Rabi season during 2017-18 to 2021-22 at Agricultural Research Station, Tamil Nadu Agricultural University, Tamil Nadu, India were evaluated. Eberhart - Russel model was used for stability analysis in rice. In this model, genotype mean across environments, regression of genotype on environmental index and function of the squared deviation from the regression were determined. Mean sum of squares against environment source of variation as well as linear component of environment were significant for all the studied characters suggesting a presence of variation among the environments tested. The linear component of genotype x environment interaction was also found significant for all the traits studied which indicated presence of significant differences between the genotypes. The landraces Kallurundaikar and Kattanur responded favourably to better environments but gave poor yield in an unfavourable environment. Hence, they are suitable for favourable environments. Sivappuchithiraikar and Mysore malli recorded the highest grain yield with bi value closer to unity and non-significant deviation from regression. They were reported as stable genotypes and recommended for cultivation in southern districts of Tamil Nadu. Bangladesh J. Bot. 52(4): 941-948, 2023 (December)

The effect of different layer genotypes raised in the Free-range system on egg quality storage at different temperatures

The aim of this study was to investigate the effect of stored eggs obtained from different layer genotypes raised in a Free-range system on egg quality at different storage temperatures. Lohmann Brown, Lohmann Sandy, and ATAK-S were used as layer genotypes in the study. The study was performed in a 3x2 factorial design with three genotypes and two storage temperatures. A total of 300 table eggs were used in the study. Egg quality analysis was carried out on 100 eggs from each genotype. Eggs were stored in refrigerator (4±2°C) and at room temperature (22±2°C) for 28 days. Egg quality was determined in 10 eggs from each group after 0, 7, 14, 21, and 28 days of storage, and the effects of temperature, genotype, and temperature x genotype interaction were determined. In the study, the effects of genotype and storage temperature on egg weight loss, Haugh unit, yolk index, and albumen pH were determined to be significant (P&amp;lt;0.05). However, the interaction effects of storage temperature x genotype were not statistically significant for any period of storage on egg quality characteristics such as Haugh unit and albumen pH. As a result, it was determined that eggs stored at refrigerator temperature during the research, depending on the storage conditions, preserved their quality characteristics better than those stored at room temperature. The study concluded that the eggs of the ATAK-S genotype had a lower shelf life compared to those of the Lohmann Sandy and Lohmann Brown genotypes.