Lablab purpureus (Linn.) sweet is an important multipurpose legume crop grown widely in the tropical and subtropical parts of the world. The crop is rich in dietary fiber and several nutritional values like proteins (dolichin, arcelin), vitamins (folate and niacin), and minerals (P, Fe, Zn, Cu, Mn, and Se). Due to the presence of flavonoids like genistein and kievitone, it also possesses antioxidant, antiviral, and anticancerous properties. Comparatively, the lower content of phytic acid over the other legumes provides an advantage in overcoming malnutrition-related disorders like anemia, which is prevalent among women and children, especially in developing countries. The crop is mostly grown as a rainfed crop, and due to its wider adaptability, it has been found resilient to varied climatic conditions. Based on quantitative traits and molecular markers, a wider diversity has been observed in Asia as well as the African continents. The results of haplotype network analysis of nuclear SSR markers affirmed two domestication routes: the ssp. uncinatus is domesticated from a two-seeded-pod wild lablab (wild spp. uncinatus) from East Africa (Ethiopia), while the ssp. purpureus and bengalensis are domesticated from a four-seeded-pod wild lablab from Central Africa (Rwanda). The wider variability has also been observed for the color of the pods, and the purple color of the pods is due to the copigments, that is, anthocyanins and flavonols. The yield and quality traits have shown high heritability and genetic advance; the diverse genetic resources could be utilized for the further hybridization and selection of the genotypes with desirable traits. SSR marker trait association analysis identified associations between KT Dolichos (KTD) 200 with days to flowering, KTD 273 for fresh pod yield/plant, and KTD 130 for number of fresh pods/plant and could be utilized in marker-assisted breeding. Locus PvTFLy1 governs the determinate growth habit of lablab beans associated with photoperiod-responsive flowering. The growth habit in lablab beans is controlled by two major genes, with determinacy being inherited by two recessive alleles. The high-yielding and determinate genotypes can be developed by hybridization and early selection of the segregates, preferably in F3 for the determinate growth habit and in advance generation for higher yield. Moreover, emerging challenges of climate change and the nutritional and livelihood security in the tropical and subtropical parts of the world can be solved by the conservation and utilization of the genetic resources in the lablab bean.

Lablab Bean Genetic Resources

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发表日期：

2025年

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Veerendra Kumar Verma,
Amit Kumar

摘要

Lablab purpureus (Linn.) sweet is an important multipurpose legume crop grown widely in the tropical and subtropical parts of the world. The crop is rich in dietary fiber and several nutritional values like proteins (dolichin, arcelin), vitamins (folate and niacin), and minerals (P, Fe, Zn, Cu, Mn, and Se). Due to the presence of flavonoids like genistein and kievitone, it also possesses antioxidant, antiviral, and anticancerous properties. Comparatively, the lower content of phytic acid over the other legumes provides an advantage in overcoming malnutrition-related disorders like anemia, which is prevalent among women and children, especially in developing countries. The crop is mostly grown as a rainfed crop, and due to its wider adaptability, it has been found resilient to varied climatic conditions. Based on quantitative traits and molecular markers, a wider diversity has been observed in Asia as well as the African continents. The results of haplotype network analysis of nuclear SSR markers affirmed two domestication routes: the ssp. uncinatus is domesticated from a two-seeded-pod wild lablab (wild spp. uncinatus) from East Africa (Ethiopia), while the ssp. purpureus and bengalensis are domesticated from a four-seeded-pod wild lablab from Central Africa (Rwanda). The wider variability has also been observed for the color of the pods, and the purple color of the pods is due to the copigments, that is, anthocyanins and flavonols. The yield and quality traits have shown high heritability and genetic advance; the diverse genetic resources could be utilized for the further hybridization and selection of the genotypes with desirable traits. SSR marker trait association analysis identified associations between KT Dolichos (KTD) 200 with days to flowering, KTD 273 for fresh pod yield/plant, and KTD 130 for number of fresh pods/plant and could be utilized in marker-assisted breeding. Locus PvTFLy1 governs the determinate growth habit of lablab beans associated with photoperiod-responsive flowering. The growth habit in lablab beans is controlled by two major genes, with determinacy being inherited by two recessive alleles. The high-yielding and determinate genotypes can be developed by hybridization and early selection of the segregates, preferably in F3 for the determinate growth habit and in advance generation for higher yield. Moreover, emerging challenges of climate change and the nutritional and livelihood security in the tropical and subtropical parts of the world can be solved by the conservation and utilization of the genetic resources in the lablab bean.