Abstract
Mungbean (Vigna radiata L.) is an important food grain legume, but its production capacity is threatened by global warming, which can intensify plant stress and limit future production. Identifying new variation of key root traits in mungbean will provide the basis for breeding lines with effective root characteristics for improved water uptake to mitigate heat and drought stress. The AVRDC mungbean mini core collection consisting of 296 genotypes was screened under modified semi-hydroponic screening conditions to determine the variation for fourteen root-related traits. The AVRDC mungbean mini core collection displayed wide variations for the primary root length, total surface area, and total root length, and based on agglomerative hierarchical clustering eight homogeneous groups displaying different root traits could be identified. Germplasm with potentially favorable root traits has been identified for further studies to identify the donor genotypes for breeding cultivars with enhanced adaptation to water-deficit stress and other stress conditions.
Highlights
Worldwide, mungbean or green gram (Vigna radiata) is being cultivated on nearly 7 million hectares area [1]
Trait primary root length (PRL) ranged from 133.38 cm (EC 862594) to 1.96 cm (IC 616154) and Total root length (TRL) ranged from 60.35 cm (EC 862670) to 0.79 cm (EC 862662)
Minor differences were found for total surface area (TSA) (16.26 cm2 for IC 616276 to 1.04 cm2 for EC 862662), average root diameter (ARD) (1.74 cm for EC 862653 and 0.39 cm for IC616115) and total root volume (TRV) (0.19 cm3 for EC 862645 to 0.01 cm3 for IC 616114) (Tables 2 and S2)
Summary
Mungbean or green gram (Vigna radiata) is being cultivated on nearly 7 million hectares area [1]. Among six Asiatic Vigna species, Vigna radiata is the most widely distributed species [2]. It is a major grain legume and cash crop which is widely cultivated in South, East, and South East Asia and is increasingly grown in South America and sub-Saharan Africa. It fits in many intense cropping systems due to its photo-insensitivity and short duration nature.
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