Plum Varieties Research Articles

Characterization of frost-tolerant plum genotypes (Prunus domestica L.) in Nishabur region, Iran: a morphological and phenological assessment following natural spring frost event

BackgroundThe Nishabur region in Iran is an ancient hub for plum production, home to numerous seedling orchards and indigenous plum varieties. In 2020, an evaluation was conducted in the primary plum-growing zones of Nishabur following a harsh spring frost. Forty-one plum genotypes and local varieties capable of bearing fruit after frost incidents were selected for further examination. These plum selections were evaluated based on 60 morphological, pomological, and phenological traits related to flowers, fruits, and trees, in accordance with the UPOV (2020) plum descriptor.ResultsAmong the 41 genotypes evaluated, 35 exhibited high yields, demonstrating their potential as viable options for cultivation in frost-prone areas. The highest coefficient of variation (39.45%) was observed in the fruit color. Several genotypes demonstrated acceptable pomological traits. The genotype ‘Kh.Da.cv.04‘ has the highest values in terms of fruit weight (56.2 g), fruit width (46 mm), and fruit length (61 mm). Significant positive correlations were found between fruit length and leaf length and fruit weight and leaf blade length. Factor analysis revealed that fruit weight, size, and leaf length are the most influential factors, accounting for 52% of the total variance. In the principal component analysis (PCA), genotypes were clustered into four main groups, with ‘Kh.Da.s.02’ and ‘Kh.Da.cv.04’ positioned at the positive end of the second axis, separate from the other genotypes. Cluster analysis indicated that these genotypes, along with ‘Ha.Bokh.cv.30’, formed distinct clusters, considerably distant from the other genotypes, which were grouped into four main clusters.ConclusionsThis research highlights the presence of frost-tolerant genotypes and varieties with suitable environmental adaptability in the Nishabur region, demonstrating relatively acceptable diversity. These genotypes hold potential for breeding and germplasm conservation purposes.

Study on Evaluation of Fruit Aroma of Plum Variety Resources Based on Headspace Solid-Phase Microextraction Combined with Gas Chromatography-Mass Spectrometry.

To explore the characteristics of and variations in aroma components across different plum varieties and maturity stages, this study employed headspace solid-phase microextraction combined with gas chromatography-mass spectrometry (HS-SPME-GC-MS). This method was used to systematically analyze the aroma components of 12 early-maturing, 15 medium-maturing, and 11 late-maturing plum varieties. The variations in volatile components among these three germplasm types were then compared using multivariate statistical methods. The examination revealed that 138 aromatic components were meticulously identified and quantified, such as 26 aldehydes, 63 esters, 13 ketones, 30 alcohols, and six other compounds. Thirteen main aroma compounds including acetic acid hexyl ester, (Z)-3-hexen-1-ol acetate, hexanal, 1-hexanol, 3-hexenal, butanoic acid butyl ester, (E)-2-hexen-1-ol, hexanoic acid butyl ester, propanoic acid butyl ester, (E)-2-hexenal, L-.alpha.-terpineol, (Z)-2-hexen-1-ol acetate, and 1-butanol were considered dominant. The orthogonal partial least squares discriminant analysis (OPLS-DA) combined with variable importance projection (VIP) results showed that 24 differential aroma compounds were screened out from 38 varieties of plum fruits based on their differences in aroma components, which can be used to distinguish plum fruits at different ripening times. Twenty-four aroma-contributing compounds were identified based on their odor activity values (OAVs). Among these, 14 key aroma components with OAVs ≥ 10 were highlighted. In summary, the aroma compounds of early- and late-maturing plum germplasm exhibited rich diversity, with significant differences in aroma components between plums of varying maturity and germplasm. These differences can serve as indicators for identifying different plum germplasm.

Evaluation of commercial and taste qualities of plum fruits in the foothills of Kabardino-Balkaria

Breeding varieties with high commercial and consumer qualities of fruits is one of the priority areas in the selection and variety study of domestic plum. Accordingly, the evaluation of some commercial and consumer qualities of fruits in plum varieties in the specific conditions of the mountains and foothills of the region is of great practical and scientific interest. Taking into account market requirements and the growth of consumer demand for fruit products, it is necessary to constantly update the range of plums. In this regard, varieties and hybrid forms of European plum for the subsequent selection of variety samples with high commercial characteristics have been studied (fruit weight, their uniformity and shape, cover color, aroma, pulp juiciness, taste, etc.). As a result of the studies, variety samples with the best commercial and taste properties of fruits have been selected. The following varieties have been distinguished by a high sugar content: Čačakska rannyaya - 18.8%, Grosso de Felicio - 16.5%, Big Heart - 14.7%, Milena - 13.8%, Velikiy Gertsog - 12.7%. The following varieties have been noted for the content of organic acids: Big Heart - 1.31%, Velikiy Gertsog - 1.1%, Milena - 0.92%, Čačakska rannyaya - 0.9%, Grossa de Felicio - 0.89%. Vitamin C is found in the highest amounts in the fruits of the following varieties: Big Heart – 7.85%, Grossa de Felicio – 6.34%, Angelina – 6.2%, Kyrgyzskaya Prevoskhodnaya – 5.34%. The size of the fruit is one of the characteristic varietal properties, despite the fact that it is largely determined by the cultivation conditions, the agricultural technology used, the age of the plant, its crop load, the variety-rootstock combination, as well as a number of other circumstances. The highest fruit weights are shown by the following varieties: Big Heart - 39.1 g, Kyrgyzskaya Prevoskhodnaya - 46.3 g, Zheltaya Afaska - 53.3 g, Zheltaya Large - 56.0 g, Kabardinskaya Rannyaya - 59.0 g, Fortuna - 65.1 g, Black Star - 78.7 g, Byron Gold - 84.2 g, Grossa de Felicio - 85.3 g, Angelina - 87.0 g, Ti Chi San - 97.1 g, Burbank Giant - 120.0 g.

Dependence of Photosynthetic Activity and Yield of Plum Varieties on the Use of Non-Root Fertilizing in the Arid Zone of the Northern Caspian Sea

In 2021–2023, the effect of non-root fertilizer application on photosynthetic activity and yield of plum varieties in the arid zone of the Northern Caspian Sea was studied. It was found that the leaf surface area on average during the growing season in the variant of the combined use of Aquarin + Ultramag boron + + Ultramag calcium exceeded the control by 50%. An increase in photosynthetic potential was noted when treated with Aquarin and Master fertilizers by 25.0 and 42%, respectively. The maximum increase in yield (12.8 t/ha) was obtained during leaf processing in the variant of the combined use of Aquarin + + Ultramag boron + Ultramag calcium preparations, which exceeded the control by 34.7%. It should be noted that the best responsiveness to non-root top dressing was distinguished by the Gigantic variety, whose yield was 13.2 t/ha, which was 39% more than the control.

Quality Parameters of Plum Orchard Subjected to Conventional and Ecological Management Systems in Temperate Production Area

Environmental protection, global food security, and nutritional quality are critical issues for worldwide sustainable development. Plums (Prunus domestica L.), well-known for their rich nutritional content and distinct phytochemical profile, have received increased attention due to their potential health benefits. The present study evaluates the ecological and conventional management systems of quality parameters in three plum varieties—Tuleu Gras, Record, and Centenar—and establishes suitable practices to improve fruit quality and yields. The fruit morphometric features (color, firmness, soluble solid content, titratable acidity, and total sugar) were analyzed during their raw fruit state, while different fruit-sample extracts were assessed for phytochemical compounds and heavy metal concentrations, specifically, zinc, copper, nickel, and cadmium. The results show a wide variability in the examined characteristics among management practices that differentially accumulated throughout the ripening phase and significantly influenced the nutritional value of the plum fruit. The application of an ecological management practice yielded small plum fruits (38 g) and maintained a more consistent and vigorous fruit color compared with the conventional system (83 g). Moreover, ecological plums have higher antioxidant activities, total polyphenols, and flavonoids (21.70–25.54 µM Trolox/g of dw, 3.89–7.76 mg GAE/ g of dw, and 1.45–3.65 mg CE/g of dw, respectively). Among the content of metals in the plum fruit, copper exhibited the highest concentrations (0.83–1.21 mg/kg), while cadmium was detected at the lowest levels (0.006–0.009 mg/kg). The potential health implications of heavy metals, by calculating their estimated daily intake (EDI), target hazard quotient (THQ), and hazard index (HI), for both adults and children were also analyzed. The EDI values of accumulated elements in the plum fruits followed the order of Cu > Zn > Ni > Cd with no concern for human health (THQ and HI < 1). According to this study’s findings, fruit quality parameters are significantly higher in ecological plums, providing a compelling argument for adopting sustainable agricultural practices. These results highlight the importance of selecting sustainable agricultural practices, not only to safeguard the environment but also to ensure high-quality products suitable for human consumption.

Bioactive properties of six dried Himalayan plum cultivars and the impact of their powders on lipid peroxidation in meat emulsions

Plum fruits are among the richest sources of bioactive compounds and thereby have several therapeutic effects, in addition to being effective replacers of synthetic antioxidants in foods such as meat sausages, which are more prone to lipid oxidation. Plums have a short shelf life and are therefore mostly processed into dry forms. The study included six plum varieties and the effects of drying on their antioxidant and antiproliferative characteristics were examined. Drying resulted in the almost complete degradation of the anthocyanins. During the six months, DPPH, FRAP and ascorbic acid decreased by 11.7 %, 5.9 % and 33 % respectively, in the Krassivica plum cultivar. Compared to fresh cultivars, dried plum cultivars showed greater antiproliferative potential against both cancer cell lines, with dried Krassivica exhibiting the greatest cell proliferation inhibition of 38.63 and 94.1 % against HCT-116 (a colon cancer cell line) and MCF-7 (an estrogen-positive breast cancer cell line), respectively. Evaluation on the effect of different concentrations (2 %, 4 % and 6 %) of plum on lipid oxidation in the meat emulsion showed that with the addition of plum powder there was a significant reduction in the TBARS. A non-significant difference was observed in the TBARS values at the 1st and 3rd months of storage between the emulsion samples containing 6 % Au Rosa plum pulp powder and the sample with BHA. Thus, it was concluded that although drying has a marked influence on the quality of plum fruits, dried plums represent a good source of antioxidants, thereby promoting their use as a functional food.

Оценка сортов сливы для специфических условий предгорий Кабардино-Балкарии

Abstract. The need for constant updating of the plum assortment in the foothills of Kabardino-Balkaria is caused by the imperfection of cultivated varieties. In this regard, we are conducting a variety study of varieties of homemade plum for the subsequent selection of the best of them. As a result, cultivars with the best in a number of valuable features and properties were identified. One of the important indicators for the comparative assessment of the studied plum varieties in the conditions of the region are the flowering time, yield and commercial qualities of fruits, as they characterize the resistance of the variety to adverse factors and its economic efficiency. Medium- and late-flowering varieties are considered more valuable, due to the fact that they escape the destructive effects of recurrent frosts and, as a rule, are characterized by regular fruiting. Milena, Early Hermenchik, Fortuna, October Sun, Top Hit, Byron Gold and the Grand Duke are among the studied cultivars with a late onset of flowering. In the middle term, they bloom – Big Prince, Kyrgyz excellent, Kuban comet, Kabardian early, Top Giant, Angelino, Black Star. All the studied varieties entered the period of full economic fruiting and began to yield high yields. In this regard, varieties with yields in terms of 1 ha are qualitatively distinguished: Kyrgyz excellent – 54 t/ha, Kabardian early – 35.3 t/ha, Top Giant – 34 t/ha, Byron Gold – 33.6 t/ha, Top Hit – 32.8 t/ha, Grand Duke – 32.1 t/ha, Chachak early – 31.9 t/ha, Big Hart – 31.5 t/ha, Ti chi san – 31.3 t/ha. A characteristic varietal feature is the size of the fruit, although to a large extent it depends on the growing conditions, the agricultural technology used, the age of the tree, the load of its harvest, rootstock and a number of other factors. Varieties have high fruit weight indicators: Ti chi san – 98,8 g, Angelina – 91,4 g, Top Giant – 90,1 g, Grosso de Felicio – 86,5 g, Byron Gold – 83,9 g, Oktouber San – 68,9 g, Kabardian early – 62,5 g, Yellow large – 56,4 g, Grand Duke – 52,6 g, Yellow Afaska – 42,3 g. Keywords: plum, varieties, adaptability, yield, commercial qualities of fruits

Economic and Technical Assessment of the Chinese Plum Varieties Using Multi-Criteria Analysis Methods

Economic and Technical Assessment of the Chinese Plum Varieties Using Multi-Criteria Analysis Methods

Sorbitol metabolism plays a key role in the differential accumulation of sugar in two plum cultivars.

Sugar is vital for plant growth and determines fruit quality via its content and composition. This study explores the differential sugar accumulation in two plum varieties, 'Fengtangli (FTL)' and 'Siyueli (SYL)'. The result showed that 'FTL' fruit displayed higher soluble solids and sugar content at various development stages. Metabolomic analysis indicated increased sorbitol in 'FTL', linked to elevated sorbitol-6-phosphate-dehydrogenase (S6PDH) activity. Transcriptome analysis identified a key gene for sorbitol synthesis, PsS6PDH4, which was significantly higher expressed in 'FTL' than in 'SYL'. The function of the PsS6PDH4 gene was verified in strawberry, apple, and plum fruits using transient overexpression and virus-induced gene silencing techniques. The results showed that overexpression of the PsS6PDH4 gene in strawberry, apple, and plum fruits promoted the accumulation of soluble solids content and sorbitol, while inhibition of the gene reduced soluble solids content and sorbitol content. Meanwhile, analysis of the relationship between PsS6PDH4 gene expression, sorbitol, and soluble solids content in four different plum varieties revealed a significant correlation between PsS6PDH4 gene expression and soluble solids content as well as sorbitol content. This research discovered PsS6PDH4 as a crucial regulator of sugar metabolism in plum, with potential applications in improving fruit sweetness and nutritional value in various fruit species. Understanding these molecular pathways can lead to innovative approaches for enhancing fruit quality, benefiting sustainable agriculture and consumer preferences in the global fruit industry.

The influence of the Reglalg biostimulator and micro elements on the photosynthetic productivity of native and foreign plum varieties

The research carried out with plum plants under controlled conditions (lysimeters, Institute of Genetics, Physiology and Plant Protection) with varieties of local and foreign selection in 2023 revealed the stimulatory effect as a result of treatments with solutions containing Reglalg and a mixture of trace elements - B, Zn, Mn, Mo regarding the formation and activity of the photosynthetic apparatus that contributed to the realization of the production potential of plants. The work in this direction with plum plants for six years aims to highlight the most informative indicators of the pigment background and photosynthetic activity of different plum varieties under the exogenous influence of biologically active substances and microelements.

The Tomato Variety Affects the Survival of Shigella flexneri 2a in Fruit Pericarp.

The presence of enteric pathogens in produce can serve as a significant means of transmitting infections to consumers. Notably, tomatoes, as a type of produce, have been implicated in outbreaks caused by various human pathogens, such as Salmonella enterica and pathogenic Escherichia coli. However, the survival characteristics of Shigella spp. in tomatoes have not been thoroughly investigated. In this study, we assess the survival of S. flexneri 2a in two distinct varieties of post-harvested tomatoes. S. flexneri 2a was used to inoculate both regular-sized Vine tomatoes and cherry-type Mini Plum tomatoes. Our findings reveal no significant difference in Shigella survival in the pericarp of both varieties on day 2 post-inoculation. However, a significant disparity emerges on day 6, where all recovered Shigella colonies exclusively belong to the Mini Plum variety, with none associated with the Vine type. When Shigella was inoculated into the locular cavity (deep inoculation), no significant difference between varieties was observed. Additionally, we investigate the potential role of the SRL pathogenicity island (SRL PAI) in the survival and fitness of S. flexneri 2a in post-harvested tomatoes. Our results indicate that while the SRL PAI is not linked to the survival of the strains in tomato, it does impact their fitness. These findings underscore the variability in Shigella strains' survival capabilities depending on the tomato variety, highlighting the importance of understanding Shigella ecology beyond the human host and identifying molecular determinants influencing bacterial survival to mitigate the risk of future outbreaks. The significance of this data on Shigella persistence in fresh vegetables should not be underestimated, as even a small number of Shigella cells can pose a threat to the health of individuals.

Differences in Volatile Profiles and Sensory Characteristics in Plum Spirits on a Production Scale

The specific sensory properties attributed to distillates from different plum varieties are intricately linked to aromatic substances, fruit quality, and technology employed during production. This study compares four plum brandies, each made from a renowned plum variety: Presenta, Valjevka, Čačanská lepotica, and Čačanská rodná on a production scale. Analytical and sensory profiles were assessed using GC-FID, an available analytical method advantageous for monitoring industrial fruit distillate production. Between 71 and 85 analytes were detected in the distillates, with the Presenta plum distillate containing the highest number of substances. Statistically significant differences in analyte concentration between plum varieties (p < 0.05) were observed for 11 analytes. The comparison of analytical profiles and sensory evaluation revealed that a high concentration of 1-propanol, despite its negative sensory perception, significantly impacts the overall perception of a distillate, contrasting with substances like acetaldehyde and propyl acetate, which have positive sensory evaluations but lesser significance in content. Our work identified key compounds and procedures that can be used as benchmarks for production of plum brandy with positive sensory evaluation. These findings demonstrate the broad application potential of GC-FID in fruit distillate production as an independent tool for aromatic profile assessment and quality control.

Optimization of clonal micropropagation of stone fruit crops

The aim of the research was to optimize the clonal micropropagation of stone crops through the use of improved techniques. The objects of the research at the stage of introduction into culture in vitro were meristematic apexes, at the stage of micro-propagation itself – micro-shoots, at the rooting stage – rooted micro-shoots, at the adaptation stage – micro-plants. All experiments were carried out according to generally accepted methods using the example of the steppe cherry variety Shchedraya, the domestic plum variety Kazanskaya and the hybrid sweet cherry Fatezh. As a result of the research, it was found that the use of a 10 % chlorhexidine solution for sterilization of the initial plant material of stone crops increased the survival rate of apexes on average by 2.4 %; the combined use of growth regulators 6-benzylaminopurine 0.5 mg/l, gibberellic acid 0.2 mg/l, indo-lil-3-butyric acid (IBA) 0.2 mg/l in a nutrient medium and an experimental diode pulsed phytoirradiator in the last proliferation passage activated the proliferation of micro-shoots, increasing the reproduction coefficient of stone crops in 6 passages by an average of 0.9 pcs/explant; the addition of 1.0 mg/l (IBA ) to the nutrient medium provided an increase in the rooting capacity of micro-shoots of stone crops by an average of 9.6 %. The treatment of micro-plants of stone crops at the stage of adaptation by spraying with an 8 % solution of the extract of the products of the larvae of the large wax moth and the use of an experimental LED pulsed phytoirradiator with a mixed spectrum contributed to an increase in their survival rate by an average of 12.4 %. Compliance with the proposed improved methods of clonal micropropagation of stone crops using growth regulators and an experimental LED pulse phytoirradiator with a mixed spectrum made it possible to increase the yield of standard adapted micro-plants by 2 times. At the same time, the cost of one adapted micro-plant decreased by an average of 11.4 rubles, and the profitability of obtaining improved stone crop material increased by 33.7 % and amounted to 160.7 %.

The effect of non-root fertilizing on the yield and quality of plum fruits of the Velikaya sinyaya variety in arid conditions of the Northern Precaspian Sea

The research was carried out in order to study the effect of non-root fertilizing using complex fertilizers on the yield and quality of plum fruits of the Velikaya sinyaya variety in the Astrakhan region. The following treatment variants with complex fertilizers were used in the experiment: Master; Aquarin; Ultramag Boron + Ultramag Calcium; Aquarin + Ultramag Boron + Ultramag Calcium. Non-root fertilizing of plum plants was carried out before flowering, after flowering and during fruit development. On average for 2021-2023 non-root treatments contributed to an increase in the number of plum ovaries compared with the control (water treatment) by 3.3...26.7 %, the best result was obtained in the variant Ultramag Boron + Ultramag Calcium. In all variants of the experiment, foliar fertilization increased the yield of plum of the Velikaya sinyaya variety by 3.1...4.2 t/ha (LSD05 = 0.1 t/ha). The highest yield of plum fruits was formed in the variant Aquarin + Ultramag Boron + Ultramag Calcium – 12.9 t/ha (in the control – 8.7 t/ha). The maximum values of the average fruit weight were obtained in the variants Ultramag Boron + Ultramag Calcium and Aquarin + Ultramag Boron + Ultramag Calcium – 45.1 and 45.6 g, respectively (in the control – 43.3 g, LSD05 = 1.2 g). Foliar fertilizing with Ultramag Boron fertilizers together with Ultramag Calcium provided a higher sugar content (14.2 %) and the value of the sugar acid index (17.7) in the fruits of the Velikaya sinyaya plum variety (at the control – 13.2 % and 16.5 respectively).

The importance of foliar feeding in increasing the productivity of plum varieties in acute adrid conditions of the lower Volga region

The importance of foliar feeding in increasing the productivity of plum varieties in acute adrid conditions of the lower Volga region

Research on the influence of the Reglalg biostimulator in combination with micro elements on the activity of peroxidase and catalase in the leaves of some plum varieties

Research on the influence of the Reglalg biostimulator in combination with micro elements on the activity of peroxidase and catalase in the leaves of some plum varieties

Irrigation and Fertilization: A Comprehensive Analysis of Their Influences on Qualitative Indices in Two Plum Varieties

The chief aim of this study is to provide information regarding the value and effectiveness of localized irrigation applied to plum trees grown in nurseries; this study also emphasizes how irrigation impacts various qualitative indices in the context of different fertilization treatments. By increasing production in the nursery, the application of differentiated rules for fertilization and irrigation is expected to yield vigorous, healthy fruit tree planting material. As in the case of all cultivated plants, fruit trees in nurseries are primarily dependent on soil and climatic conditions. This research was carried out in a private fruit tree nursery in the northwestern part of Romania. The soil taxonomic unit identified on the research field was arable, weakly glaciated loamy clay on fluvial deposits. The two plum cultivars that were studied were Stanley and Cacanska Lepotica, both of which are valued for the high caliber of their fruit. This research was conducted using a 4 × 2 × 4 trifactorial experiment, with irrigation acting as the primary factor, cultivar as the secondary factor, and fertilization as the tertiary factor. During this research, the fertilization treatments proved to have the most significant impact (34.50%) on stem diameter compared with irrigation (20.67%) and cultivar (5.63%), given that the cultivar had no discernible influence on the increase in the diameters of the grafted trees.

Determination of Plum Varieties Suitable for Fruit Juice Industry and Their Suitability for Drying

Determination of Plum Varieties Suitable for Fruit Juice Industry and Their Suitability for Drying

К НАУЧНЫМ ОСНОВАМ СОЗДАНИЯ ЦИТРУСОВЫХ «ДЕРЕВЬЕВ САДОВ»

The main breeding techniques used in the 50s of the 19th century by breeder F.M. Zorin – creator of the Friendship Tree, candidate of agricultural sciences (1944), are considered. Fyodor Mikhailovich developed valuable varieties of mandarin oranges, grapefruits, lemons, plums, figs, and hazelnuts. Author of more than 40 scientific papers. He was awarded the State Prize for the creation of new varieties of fruit plants. This article shows theoretical research and practically used methods for breeding new varieties of citrus fruits. The basis of his research was vegetative hybridization (from Greek “hybris” – inbreeding) – the production of hybrids by grafting. Zorin F.M. paid a special role in the breeding work to “tree gardens”, which were of both scientific and industrial importance. Fruits from such a tree could change shape, size, color and ripening time. At the same time, he paid attention not only to the selection of the scion, but also the rootstock. As a result, such a tree had many trunks, and the crown consisted of numerous varieties and species of three genera – Citrus, Fortunella, Poncirus of the Rutaceae family. Almost the entire Pomeranian subfamily (Aurantioideae) grafts onto each other and is highly compatible. It is important to take into account varietal characteristics: timing of flowering and ripening, as well as their biology. The main advantages of citrus «tree-gardens» are the saving of garden space, the aesthetic appearance of the trees and originality, as well as the ability to obtain more varieties per unit area.

Detection of variety and wax bloom of Shaanxi plum during post-harvest handling

The detection of plum variety and wax bloom has extensive applications in the fields of fruit classification and fruit quality assessment. By automating the detection and identification of plum varieties and wax bloom, it is possible to enhance the efficiency and accuracy of variety identification and quality assessment, and reduce manual intervention and misjudgment, thereby improving the market competitiveness of fruits. Currently, many works focus on improving the detection performance of single attribute detection of plum varieties or wax bloom, and it is often necessary to use two models to detect the same plum variety and quality information separately, which leads to inefficient and resource-consuming problems in practical applications. To solve this problem and improve the efficiency of detection, a Multi-Label detection model based on YOLOv7 is proposed. Firstly, the double detection head structure is introduced to improve the prediction ability for two types of attribute features. Then, the loss function suitable for multi-attribute labels is improved, and two classification loss functions are used to optimize the prediction results of the two types of attribute labels, respectively. Finally, a multi-label non-maximum suppression algorithm is proposed to solve the problem of filtering redundant bounding boxes of multi-attribute labels. Experimental results on the plum image dataset show that the proposed Multi-Label YOLOv7 model achieves a mAP@0.5 of 96.2 %, a precision of 94.6 %, and a recall of 89.5 %. The experimental results show that the Multi-Label YOLOv7 model can effectively detect variety and wax bloom attributes and improve the efficiency of multi-attribute label detection. The code and dataset for this experiment can be found at https://github.com/hejinrong/Muti-Label-YOLOv7.