Peanut Production Research Articles

Differential responses of root and leaf-associated microbiota to continuous monocultures

Continuous monocultures alter the composition and function of root-associated microbiota, and thus compromise crop health and productivity. In comparison, little is known about how leaf-associated microbiota respond to continuous monocultures. Here, we profiled root and leaf-associated microbiota of peanut plants under monocropping and rotation conditions. Additionally, their protective effects against root pathogen Fusarium oxysporum and leaf pathogen Alternaria alstroemeriae were evaluated. We found that monocropping increased root and leaf disease severity. Meanwhile, the peanut growth and productivity were inhibited by monocropping. Microbiota analysis revealed that monocropping reduced rhizosphere microbial population and diversity, while increased leaf epiphytic microbial population and did not influence leaf epiphytic microbial diversity. Cropping conditions had a greater impact on the microbiota composition of leaf epiphytes than that of the rhizosphere. Moreover, in vitro and in vivo experiments, combined with correlation analyses showed that monocropping weakened the antagonistic activity of rhizosphere microbiota against F. oxysporum and root rot disease. This effect may be associated with the depletion of Bacillus sp. and Sphingomonas sp.. By contrast, leaf epiphytic microbiota under monocropping exhibited greater inhibition of A. alstroemeriae growth and leaf spot control. Together, our results demonstrated a differential response pattern of root and leaf-associated microbiota to continuous monocultures.

Growth and yield of peanut on peat soil of different dolomite lime and shrimp waste Liquid Organic Fertilizer (LOF) levels

The application of dolomite lime and shrimp waste Liquid Organic Fertilizer (LOF) is expected to improve the quality of peat soil to support the growth and yield of peanuts. The study was aimed at the role of dolomite lime and shrimp waste LOF in the development and yield of peanuts on peat soil. The study was conducted in Kubu Raya Regency, West Kalimantan, from April to August 2024. The factorial, completely randomized design was used to arrange the field experiment. The treatment factors were the dosage of dolomite lime (3, 6, and 9 tons ha-1) and the concentration of shrimp waste LOF (200, 300, and 400 mL L-1). The results showed that using dolomite lime and shrimp waste LOF increased the growth and yield of peanuts on peat soil. The interaction of dolomite lime 6 tons ha-1 and shrimp waste LOF 400 mL L-1 effectively increased root volume. The best individual dolomite lime treatment level for peanut growth was 6 tons ha-1; for production, it was 9 tons ha-1. The best individual shrimp waste LOF treatment level for growth was 300 mL L-1; for production, it was 400 mL L-1. Keywords: amelioration; peanut production; soil fertility

Sensitivity determination and resistance mechanism of Sclerotium rolfsii to difenoconazole.

Peanut stem rot, caused by Sclerotium rolfsii, has become increasingly prevalent in China, leading to significant yield losses in peanut production. To effectively manage peanut stem rot, we assessed the potential application of difenoconazole against peanut stem rot. Difenoconazole has a good inhibitory effect on the mycelial growth of S. rolfsii, with half maximal effective concentration (EC50) values ranging from 0.10 to 1.58 μg/mL and an average of 0.33 ± 0.02 μg/mL. Nonetheless, a small percentage of wild-type isolates exhibiting low resistance to difenoconazole were identified in the field. The primary reason for S. rolfsii resistance to difenoconazole was found to be attributed to the overexpression of CYP51. In addition, a small number of resistant isolates also exhibited multidrug resistance through the overexpression of efflux pump genes atrB and atrD. Pot experiments revealed that difenoconazole demonstrated superior protective efficacy against peanut stem rot, with mist spray treatment exhibiting better control efficacy compared to root drench treatment. Specifically, at a concentration of 100 μg/mL, the protective efficacy of difenoconazole mist spray against peanut stem rot reached 65.24%, which was statistically similar to that of tebuconazole. Furthermore, no significant correlation was observed between sensitivity to difenoconazole and mefentrifluconazole, benzovindiflupyr, boscalid, thifluzamide, carboxin, or picoxystrobin. To delay the emergence of resistant populations, we recommend early-stage application of difenoconazole via spraying for peanut stem rot management, alongside the judicious use of fungicides with no cross-resistance like thifluzamide and boscalid for optimal control. © 2024 Society of Chemical Industry.

Quantification of Viable Salmonella by Propidium Monoazide Real-Time PCR After Long-Term Storage of Peanut Products.

In this study, the performance of quantitative PCR, combined or not with propidium monoazide (PMA), to recover Salmonella from peanut products after different storage times was evaluated. The samples were inoculated with 5-6 log cfu g-1 of Salmonella Typhimurium ATCC 14028 and stored at 28 °C for up to 540 d. The correlation between the threshold cycle number (Ct) and the colony-forming units (cfu) was obtained by a standard curve, which showed a linear correlation (R2 = 0.97). The highest counts were recovered by qPCR (p < 0.05); however, it quantified both viable and non-viable cells. For roasted peanuts, a significant difference (p < 0.05) between qPCR-PMA and the culture method was verified only for samples stored for 30 d, i.e., 2.8 versus 4.0 log cfu g-1. Further, there was no VBNC status in the roasted peanuts, even after long-term exposure to desiccation stress. For peanut-based products, after 540 d, only paçoca showed a significant difference (p < 0.05) among the three methods evaluated. In peanut brittle, qPCR-PMA detected 1.5 log cfu g-1, while, in the culture method, Salmonella was recovered in 1 g. The pathogen was below the detection limit in pé-de-moça either by plate count or qPCR-PMA. Therefore, qPCR-PMA shows potential for use in quantifying Salmonella in peanut products.

The Application of Plant Growth Promoting Rhizobacteria Technology to Increase Peanut Production in Poor Farmers "Sumber Hidup" Farmer Group of Sigerongan Village

The Application of Plant Growth Promoting Rhizobacteria Technology to Increase Peanut Production in Poor Farmers "Sumber Hidup" Farmer Group of Sigerongan Village

How to incentivize peanut producers to adopt post-harvest aflatoxin control measures: A field experiment in Haiti

Aflatoxin contamination in peanuts represents a significant public health concern in many developing countries, including Haiti, a low-income country. Although simple post-harvest mitigation measures exist, their adoption by Haitian farmers remains limited. This study assesses the willingness to accept (WTA) of peanut producers in Haiti to implement post-harvest measures, using a reversed Becker-DeGroot-Marschak (BDM) auction. It also tests the effect on WTA of a conditional market access. For one group the research project commits to purchase peanuts at a predetermined price if aflatoxin levels meet a maximum of 10 parts per billion, while another group receives unconditional market access at the same predetermined price. Moreover, Haitian supermarket consumers’ willingness to pay (WTP) a premium for a local peanut butter (mamba) certified to meet aflatoxin standards is explored. Results indicate that conditional market access generates higher WTA. Haitian supermarket consumers show strong interest in certified peanut butter, with a declared premium of 21.1 % over the market price of a 16-ounce jar of non-certified peanut butter. If we consider intermediary margins as high as 86 % of the final consumer price—well above the current 68 % reported in previous studies—as well as for a potential hypothetical bias as high as two thirds of the stated WTP, this premium is sufficient to incentivize Haitian peanut producers, measured by their observed WTA. Thus, a market solution to the aflatoxin problem in Haiti seems plausible for supermarket consumers.

New fungicide options for managing Sclerotinia blight of peanut

Late leaf spot (LLS), caused by Nothopassalora personata, and Sclerotinia blight (SB), caused by Sclerotinia minor, are significant diseases affecting peanut production in Virginia. Field trials were conducted in 2020 - 2022 at two locations per year to identify fungicide programs that manage both diseases. In 2020, pydiflumetofen applied independently, as well as in combination with a premix of azoxystrobin + benzovindiflupyr, provided effective protection against both LLS and SB. This combination demonstrated potential as a cost-effective alternative to fluazinam. Years 2021 and 2022 focused on the most effective timing of pydiflumetofen and the premix of azoxystrobin + benzovindiflupyr. Results demonstrated that the combination of pydiflumetofen and the premix of azoxystrobin + benzovindiflupyr applied 60 and 90 days after planting was most consistent in providing the greatest efficacy against both diseases while improving yield. The tank-mix/premix combination of pydiflumetofen and azoxystrobin + benzovindiflupyr offers effective and economical management of both LLS and SB compared to fungicide programs where fluazinam is added for SB management only.

Occurrence of Total Aflatoxins (B1, B2, G1, G2) in Commercial Peanut and Peanut Butter from the Saudi Market in the Period From 2015 to 2020

Nut products are susceptible to contamination with mycotoxin, especially aflatoxins, which results of mold growth during harvest or storage. This study aimed to evaluate the occurrence of aflatoxins in peanut products from the Saudi market. A total of 472 samples of peanut and peanut butter imported from various countries were collected in the period from 2015 to 2020. All samples were analyzed by High-Performance Liquid Chromatography (HPLC). Total aflatoxins (B1, B2, G1, G2) were found to exceed the maximum level (ML) in 38 samples (8.1%) with a concentration range of 15.56-973.21µg/kg, while 434 samples were below ML (91.9%). Specifically, in Peanut butter samples, 27 out of 333 were contaminated with Aflatoxins (8.8%), and 11 out of 139 peanut samples were contaminated with aflatoxins (8.6%). The results show that the percentage of Aflatoxins contamination was reduced in the period (2019 – 2020) compared to (2015 – 2018), due to the control of mycotoxins in Saudi Arabia which played an important role in reducing the contamination of AFs in peanut products.

The Effective Sorting Technologies for Reducing Aflatoxins in Nuts and Dried Figs in Turkey

Background: RASFF notifications serve to determine the hazards responsible for food and feed. In case of determining risks to human health, the information provided to member countries via the rapid alarm system at the same time warned us to take the necessary measures. Objectives: In this research, the RASFF portal alerts over the last three years related to aflatoxins in hazelnut, fig, and peanut products were examined. The impact of image processing technologies on lowering the danger of aflatoxins in shelled hazelnuts and dried figs was also investigated, as well as Critical Control Points (CCPs) on aflatoxin hazard. Methods: The RASFF database was used in the RASFF Window portal and analyzed for aflatoxin alerts. ISO 22000:2018 was used for hazard and risk analysis for raw hazelnut, peanut, and fig products. Aflatoxin analyses were performed according to the AOAC 2000/991.31 method. Prior to and after hazelnut sorting methods, levels of aflatoxin were measured. Besides, aflatoxin contamination in peanuts harvesting in 2023 years from three local producers in Turkey was studied. Results: The number of RASFF notifications for hazelnuts, peanuts/groundnuts, dried figs, and their products for the period of 03/01/2020 to 01/06/2023 were 84, 283 and 173, respectively. As a result of HACCP implementation, especially for aflatoxin hazard management, optical-laser-manual sorting and aflatoxin detection using UV light stages are accepted as CCPs. When nuts were sorted using optical and laser systems were detected decreasing total aflatoxin levels. The mean value of Aflatoxin B1(AFB1) and total aflatoxins were reduced from 7.80±1.08 and 13.56±1.06 to 3.63±0.39 and 7.21±0.71, respectively. 79.16% of all sorted samples were found to comply with legal limits. Investigated peanut samples for aflatoxin B1 contents were found between 5.63 and 27.75 µg kg-1 in 19.5%. Conclusion: The alerts based on aflatoxin contamination above legal limits have been carried on for nuts and dried figs. The physical sorting methods using optical selection and high-resolution laser sensor systems aflatoxin-contaminated nuts from healthy nuts applied for in-shell Turkish nut sorting were able to assess the quality of the batch studied, and the systems were assigned significantly effective to reduce aflatoxin contents. Food business operators in Turkey, which is among the countries exporting agricultural and food products to the European Union (EU), have tended to prefer the most advanced technologies. Efficacies of reduction of aflatoxin by different physical and other (such as imaging, X-ray and acoustic, audio signals and hyperspectral images of moldy natural nuts etc.) methods will be developed in the near future.

The Development of Peanut Production in Turkey and Osmaniye

Peanuts are very important nutrition not only for human beings but also animals because of its rich content. Peanut plays a crucial role in the economy of Osmaniye province in Turkey. In 2012, peanuts were registered as a geographically indicated product of Osmaniye by the Turkish Patent and Trademark Office. This study examines current state of peanut production in Turkey and Osmaniye from 2004 to 2023. Over the past 20 years, peanut cultivation areas have expanded in Osmaniye, leading to increase in the share of peanut farming within cereals and other crops from about 7% in 2004 to approximately 12% in 2023. While Osmaniye held the largest share of peanut cultivation areas at 39% in 2004, this decreased to 25% by 2023. During this period, Adana emerged as a major peanut producing province, holding 45% of the cultivation share. The considerable expansion of peanut farming in Adana led to decline is Omaniye’s position in producing rankings. Additionally, the number of provinces involved in peanut farming has increased, indicating a broader geographical distribution and diversification of peanut agriculture across the country. There is a need for an organization that can support producers with affordable input supplies, market access, dissemination of innovation, and storage solutions, fostering unity and collaboration within the sector. Expanding the range of peanut based products beyond snacks could open new market opportunities for producers, stabilize market prices, and held reduce income disparities.

Effect of arbuscular mycorrhiza and rhizobium on physiology and yield of peanut under drought conditions.

Drought is the one primary issue limiting peanut growth and productivity. The study aimed to investigate the effects of arbuscular mycorrhizal fungi (AMF), rhizobium (Rhi), and their combinations on phenolic content, proline content, growth, and yield of peanut under different soil water regimes. The pot experiments were carried out for two growing seasons under greenhouse conditions and designed based on a 2×3 factorial in randomized complete block design (RCBD) with four replications. Factor A comprised two soil water regimes: field capacity (FC) and 1/3 available soil water (1/3 AW), whereas factor B included three different types of microorganisms: (i) uninoculated control, (ii) arbuscular mycorrhiza (AMF), and (iii) a combination of AMF and rhizobium (Rhi) inoculations. Data were collected for growth, proline content, phenolic content, yield, and yield components. Drought stress significantly reduced in relative water content, leaf area, biomass, yield, and yield components of peanut, whereas leaf phenolic content was increased under drought stress. Higher pod dry weight was achieved under FC conditions (28.87g plant-1), and it was reduced to 16.06g plant-1 under 1/3 FC. Interestingly, AMF+Rhi synergistically increased the leaf area compared with non-incubated peanut under 1/3 FC conditions. AMF-inoculated peanut tended to increase biomass, while the combination of AMF+Rhi tended to have higher yield components compared with uninoculated control, especially for the weight of 100 seeds.

Performance Analysis of a Multi Seed Smart Dryer Machine for Drying Peanuts (Arachis hypogaea L.)

Peanuts are the second largest legume crop in Indonesia, both cultivated on farms and wild. In 2019-2023, Indonesia experienced a decline in peanut production due to the declining in harvesting area. In addition, this is also due to the poor quality of seeds in the cultivation process. This study aims to observe the performance of the Multi Seed Smart Dryer (MSSD) machine for peanut seeding. This research was conducted by observing changes in moisture content, drying rate, drying temperature, and peanut germination test results using the Multi Seed Smart Dryer machine. The results showed that the left side of all shelves experienced an increase in temperature because it was close to the heat source and the level of temperature uniformity was still said to be uniform because it did not exceed the uniformity limit. The peak drying rate occurred at the 12th hour and decreased further. Based on the results of the germination test, the dried beans have a germination rate of 83%. This is in accordance with the passing standard of seed quality according to the Ministry of Agriculture of the Republic of Indonesia and International Seed Testing Association. Keywords: Drying, Multi Seed Smart Dryer, Peanut, Temperature.

Exogenous GABA-Ca Alleviates Growth Inhibition Induced by a Low-P Environment in Peanuts (Arachis hypogaea).

Phosphorus (P) deficiency is a major global factor constraining peanut production. Exogenous γ-aminobutyric acid (GABA) and Ca2+ are essential to improve stress resilience in peanuts growing under low-P conditions. This study therefore examined the detailed physiological effects of GABA-Ca on restoring peanut growth under low-P conditions. These included the root-shoot ratio, leaf nutrients, photochemical activity, reactive oxygen species (ROS), cyclic electron flow (CEF), ATP synthase activity, and the proton gradient (∆pH), all of which were measured under low-P (LP, 0.5 mM) and optimized-P (1 mM) conditions. Specifically, supplying GABA-Ca under LP conditions regulated the ∆pH by causing adjustments in CEF and ATP synthase activities, buffering the photosystems' activities, restoring the antioxidant enzyme system, and lowering ROS production. Interestingly, exogenous GABA-Ca restored peanut growth under low-P conditions, possibly by the putative signaling crosstalk between GABA and Ca2+. The plausible signal amplification between GABA and Ca2+ suggested that the combination of GABA and Ca, may offer an effective strategy for enhancing peanut adaptation to low-P conditions. Moving forward, the strategic supplementation of GABA-Ca, either during cultivation or through the formulation of novel fertilizers, opens up many possibilities for better and more resilient plant production in soils with low P.

Pengaruh Dosis Pupuk Kandang Kambing terhadap Pertumbuhan dan Hasil pada Dua Varietas Kacang Panjang (Vigna unguiculata L.)

Poor choice of varieties and the decrease in soil fertility are among the few variables that can affect long peanut productivity. The aim of this research is to study how the dose of goat fertilizer and long bean varieties affects the growth and yield of long beans. The research was a factorial experiment with two factors and three replications using the Randomized Blok Design (RBD) method. The first factor, the dose of goat manure 0 ton ha-1(k0), 10 ton ha-1(k1), 20 ton ha-1(k2), 30 ton ha-1(k3), and 40 ton ha-1(k4). The second factor was long bean varieties Kanton Tavi (v1) and Katrina (v2). Data were analyzed using analysis of variance (ANOVA) at the 5% level. The results of the experiment showed an interaction in the parameters of plant height 7 DAP and 14 DAP, number of leaves 14 DAP, 21 DAP, 28 DAP, number of pods per plant, and pod weight per plot. A dose of 30-ton ha-1 (k3) goat pen fertilizer produced a healthy amount of beans on the cantonese Kanton Tavi variety (v1) with X optimum (v1) = 29,08 ton ha-1 and Y maximum (v1) = 21,86 ton ha-1 and on Katrina variety (v2) X optimum (v2) = 25,15 ton ha-1 and maximum y (v2) = 20,56 ton ha-1.

Exogenous melatonin improves peanut field productivity and quality at reduced nitrogen application

ContextNitrogen (N) plays integral roles in plant growth and yield. Finding ways to increase plant yield with reduced N usage will promote both agricultural and environmental sustainability. Melatonin acts as a multifunctional regulatory molecule in numerous metabolic processes crucial for plant growth and development as well as response to environmental stresses. The effects of melatonin on the material accumulation and transport, source-sink dynamics, as well as its association with yield and quality formation of peanut (Arachis hypogaea L.) remain unclear, especially at different N levels. ObjectivesWe aim to investigate the response mechanism of melatonin in peanut plants subjected to reduced N application, in order to confirm the hypothesis that melatonin regulates carbon and N accumulation and transport, and coordinates source-sink relationships to increase production and improve quality. MethodsThis study examined the effects of two seed dressing treatments (with or without 0.5 μM MT) and three N fertilizer levels (90, 135, and 180 kg/ha) using a randomized complete block design with split plots and three biological replications over 2021 and 2022. The evaluation focused on photosynthetic physiology, enzyme activities related to carbon and N metabolism, accumulation and transport of dry matter and N, yield, and quality, while exploring the relationships among these variables. ResultsMelatonin-treated plants had more stable carbon and N metabolism than the untreated ones. This stability was linked to improved photosynthesis, sucrose production, and N assimilation, especially at the reduced N levels (90 and 135 kg/ha). Across three N levels and two years of field tests, MT increased peanut dry matter by 23.49 % from 455.63 g/m2 to 562.66 g/m2, enhanced the accumulation and mobilization of dry matter and N to grains by increasing peanut grain mass by 22.41–29.07 % at different N levels. This process appears to subsequently elevate the effective pod rate, leading to an average increase in pod yield, fat and protein content by 12.63 %, 7.95 %, and 10.33 %, respectively, over a two-year period and across three N application levels. ConclusionsPlants subjected to melatonin treatment exhibited a coordinated source-sink relationship, which is manifested in high photosynthetic capacity and a high proportion of assimilates transported to pods, thus promoting effective proportions and pod fullness to improve peanut yield and quality under reduced N application. SignificanceOur research provided insights into the response mechanism of melatonin on peanut carbon and N metabolism across various N treatments, contributing to a deeper understanding of how melatonin enhances crop yield and quality.

Progress in genetic engineering and genome editing of peanuts: revealing the future of crop improvement.

Peanut (Arachis hypogaea L.), also known as groundnut, is cultivated globally and is a widely consumed oilseed crop. Its nutritional composition and abundance in lipids, proteins, vitamins, and essential mineral elements position it as a nutritious food in various forms across the globe, ranging from nuts and confections to peanut butter. Cultivating peanuts provides significant challenges due to abiotic and biotic stress factors and health concerns linked to their consumption, including aflatoxins and allergens. These factors pose risks not only to human health but also to the long-term sustainability of peanut production. Conventional methods, such as traditional and mutation breeding, are time-consuming and do not provide desired genetic variations for peanut improvement. Fortunately, recent advancements in next-generation sequencing and genome editing technologies, coupled with the availability of the complete genome sequence of peanuts, offer promising opportunities to discover novel traits and enhance peanut productivity through innovative biotechnological approaches. In addition, these advancements create opportunities for developing peanut varieties with improved traits, such as increased resistance to pests and diseases, enhanced nutritional content, reduced levels of toxins, anti-nutritional factors and allergens, and increased overall productivity. To achieve these goals, it is crucial to focus on optimizing peanut transformation techniques, genome editing methodologies, stress tolerance mechanisms, functional validation of key genes, and exploring potential applications for peanut improvement. This review aims to illuminate the progress in peanut genetic engineering and genome editing. By closely examining these advancements, we can better understand the developments achieved in these areas.

Improving Peanut (Arachis hyphogaea L.) Productivity by Optimizing Nitrogen and Potassium Fertilization

Due to their high nutritious, peanuts (Arachis hyphogaea L.) are a popular kind among consumers. For growth and productivity, peanut plants need vital nutrients including N, P, K, Ca, Mg and K. P is especially necessary for the development of blooms, pods, and seeds. A 2 × 4 factorial design was employed in the study, and it was repeated three times. Factor II consists of P fertilizers (SP36: 36 % P2O5), specifically 0, 50, 100, and 150 kg P2O5/ha. Factor I sources of N are NO3- (potassium nitrate) and NH4+ (ammonium sulfate). The criteria that were observed were the amount of chlorophyll in the fifth leaf from the tip of the plant, NR activity, yield of the peanut pod, height of the peanut plant, and biomass of the peanut. The nitrogen source treatment has a major impact on ANR levels, yield, plant height, and chlorophyll. There is a greater interaction when using nitrate as a N fertilizer. Higher P2O5 NR yields, P up to 150 kg, Chlorophyll, height of peanut plants, peanut biomass, and yield of peanut pods are observed. Similarly, increased application of N fertilizer (ammonium, P up to 150 kg P2O5) results in higher NR yields. Height of the peanut plants, biomass, yield of the peanut pods, and chlorophyll.

Advanced Predictive Modeling for Peanut Production Estimation in Mozambique: Addressing Food Security Challenges through ARIMA and LSTM Approaches Aligned with SDG 2

Advanced Predictive Modeling for Peanut Production Estimation in Mozambique: Addressing Food Security Challenges through ARIMA and LSTM Approaches Aligned with SDG 2

Peanut production in saline-alkali land of Yellow River Delta: influence of spatiotemporal changes of meteorological conditions and soil properties

BackgroundThis study clarified the synergistic relationship among annual changes to specify the changes in agro-meteorological factors, soil characteristics and peanut growth in saline-alkali land near the estuary of the Yellow River Delta. We aimed to find the key factors affecting peanut production to optimize and regulate peanut planting mode in saline alkali soil.ResultsThe daily average temperature from early May to late September in Lijin and Kenli was above 24 °C, with 470–600 mm of precipitation. The sunshine duration was 7.9 h/day and 7.3 h/day and the accumulated temperature was 3742 °C and 3809 °C, in Lijin and Kenli, respectively. Agro-meteorological conditions were suitable for peanut growth and development with the consistent main developmental period in the two experiment regions. The best sowing period was when the soil temperature stabilized above 18 °C in early May, and the best harvest was in mid-September. The soil volumetric water content in Lijin concentrated among 25–40%. Salt was mainly distributed in the 40–60 cm soil layers, and increased rapidly to 2.5 g kg− 1 in 0–20 cm cultivation layer in mid-May due to lack of precipitation. In Kenli experiment region, the soil volumetric water content ranged from 10 to 35%. Soil salinity was mainly distributed in the 20 cm soil layer, and the changes in salinity was little affected by precipitation. From mid-July to mid-August, the effective accumulated temperature of 5 cm soil layer was above 520 °C in both regions, which could ensure the normal pod development. The slow dynamic growth of kernel, high unfilled pod rate (26.99%) and low shelling rate (66.0%) might be the main reasons for low peanut yield in Lijin.ConclusionSoil salinity was the main factor affecting pod development and yield. It was also a key point in optimizing the peanut planting mode in the saline alkali land of the Yellow River Delta.

Evaluation of ALS-Resistant Yellow Nutsedge (Cyperus esculentus) in Georgia Peanut

Abstract Accounting for 53% of United States peanuts (Arachis hypogaea L.), Georgia is the top peanut-producing state with approximately 1.42 billion kg produced in 2023. Peanut producers often use the ALS imidazolinone herbicide imazapic but reduced yellow nutsedge (Cyperus esculentus L.) control was reported in Georgia peanuts after four-years of continuous imazapic use. This study aimed to determine the level of resistance (LD50, I50, and GR50), potential cross-resistance for the suspected resistant population, and identify the associated genetic mutations conferring resistance. A susceptible biotype was treated with 0, 0.0088, 0.0175, 0.035, 0.07, 0.14, 0.28, and 0.56 kg ai ha-1, and a resistant biotype was sprayed with 0, 0.07, 0.14, 0.28, 0.56, 1.13, 2.26, and 4.5 kg ai ha-1 of imazapic. To determine if the suspected resistant biotype was cross-resistant to halosulfuron-methyl, an ALS herbicide used to control nutsedge spp., both biotypes were treated with 0, 0.0117, 0.0233, 0.0466, 0.0933, 0.187, 0.373, and 0.746 g ai ha-1 of halosulfuron-methyl. Plants were rated for injury 7, 14, and 28 days after treatment (DAT), and above-ground biomass harvested at 28 DAT. For imazapic, LD50 was 0.041 and 1.503 kg ai ha-1 and the GR50 was estimated to be 0.0128 and 1.853 kg ai ha-1 for Sus and Res biotypes, respectively, indicating 36 and 145-fold increase in resistance of the Res biotype for I50 and GR50, respectively. Both biotypes responded similarly to applications of halosulfuron-methyl, with biomass reductionat rates greater than 0.023 kg ai ha-1. Transcriptome profiles revealed a mutation in the target-site gene of the resistant biotype, causing an amino acid substitution from Alanine to Valine at position 205 (Ala205Val). Growers should continue to rotate chemistries and implement integrated weed management approaches for control of C. esculentus as the use of imazapic over consecutive years has led to resistance in C. esculentus.