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Genotypic variability for tolerance to high temperature stress at reproductive phase in Mungbean [Vigna radiata (L.) Wilczek]

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Patriyawaty, N. R., Rachaputi, R. C. N., George, D. and Douglas, C. A. (2018) Genotypic variability for tolerance to high temperature stress at reproductive phase in Mungbean [Vigna radiata (L.) Wilczek]. Scientia Horticulturae, 227 (Supple). pp. 132-141. ISSN 0304-4238

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Article Link: https://doi.org/10.1016/j.scienta.2017.09.017

Publisher URL: http://www.sciencedirect.com/science/article/pii/S0304423817305599


This study investigated variation in 28 mungbean genotypes in their response to high temperature with 45/30°C (NAc-HT) imposed at the reproductive phase, and to prior-acclimation of plants to elevated temperatures at 35/28°C before subjecting them to high temperatures (Ac-HT). Environmentally controlled growth chambers (ECGC) were used to assess the impact of high temperatures on crop growth, reproductive development and yield. The mean shoot dry matter was reduced by 21% and 24%, with grain yield by 56% and 59% in Ac-HT and NAc-HT treatments, respectively, compared to control (CON). There was significant genotypic variation in dry matter and yield (P>0.001) for temperature treatments. The mean total pollen number was reduced from 88/mm2 in CON to less than 50 in Ac-HT and 40/mm2 in NAc-HT treatments, with significant genotypic variation. The mean ratio of viable pollen to total pollen was 83%, 74% and 40% in CON, Ac-HT and NAc-HT treatments, respectively, suggesting that acclimated plants (Ac-HT) were able to maintain higher pollen viability than non-acclimated plants (NAc-HT). The viable pollen number was linearly related to pod number (r2=0.55**) and grain yield (r2=0.62**) on a per plant basis. Based on shoot biomass, grain yield and other physiological parameters, genotypes were grouped as tolerant or susceptible, for further studies.

Item Type:Article
Business groups:Crop and Food Science
Keywords:Acclimation High temperature Reproductive phase Mungbean genotypes
Subjects:Science > Botany > Genetics
Agriculture > Agriculture (General) > Methods and systems of culture. Cropping systems
Plant culture > Seeds. Seed technology
Live Archive:17 Jan 2018 01:07
Last Modified:02 Nov 2022 00:13

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