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Open AccessArticle

Physiological Basis of Combined Stress Tolerance to Low Phosphorus and Drought in a Diverse Set of Mungbean Germplasm

1
Division of Plant Physiology, ICAR-Indian Agricultural Research Institute, New Delhi 110012, India
2
Division of Germplasm Evaluation, ICAR-National Bureau of Plant Genetic Resources, New Delhi 110012, India
3
Division of Genetics, ICAR-Indian Agricultural Research Institute, New Delhi 110012, India
*
Author to whom correspondence should be addressed.
Present address: ICAR-Indian Institute of Pulse Research, Regional Research Station Bikaner, Rajasthan, India.
Agronomy 2021, 11(1), 99; https://doi.org/10.3390/agronomy11010099
Received: 30 November 2020 / Revised: 26 December 2020 / Accepted: 30 December 2020 / Published: 7 January 2021
(This article belongs to the Special Issue Improving Mineral Nutrition to Obtain Stress Tolerant Crops)
To understand the physiological basis of tolerance to combined stresses to low phosphorus (P) and drought in mungbean (Vignaradiata (L.) R. Wilczek), a diverse set of 100 accessions were evaluated in hydroponics at sufficient (250 μM) and low (3 μM) P and exposed to drought (dehydration) stress. The principal component analysis and ranking of accessions based on relative values revealed that IC280489, EC397142, IC76415, IC333090, IC507340, and IC121316 performed superior while IC119005, IC73401, IC488526, and IC325853 performed poorly in all treatments. Selected accessions were evaluated in soil under control (sufficient P, irrigated), low P (without P, irrigated), drought (sufficient P, withholding irrigation), and combined stress (low P, withholding irrigation). Under combined stress, a significant reduction in gas exchange traits (photosynthesis, stomatal conductance, transpiration, instantaneous water use efficiency) and P uptake in seed and shoot was observed under combined stress as compared to individual stresses. Among accessions, IC488526 was most sensitive while IC333090 and IC507340 exhibited tolerance to individual or combined stress. The water balance and low P adaptation traits like membrane stability index, relative water content, specific leaf weight, organic acid exudation, biomass, grain yield, and P uptake can be used as physiological markers to evaluate for agronomic performance. Accessions with considerable tolerance to low P and drought stress can be either used as ‘donors’ in Vigna breeding program or cultivated in areas with limited P and water availability or both. View Full-Text
Keywords: mungbean; low phosphorus; drought stress; organic acid exudation; photosynthetic rate; relative water content; membrane stability index; stress susceptibility index; principal component analysis ranking mungbean; low phosphorus; drought stress; organic acid exudation; photosynthetic rate; relative water content; membrane stability index; stress susceptibility index; principal component analysis ranking
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MDPI and ACS Style

Meena, S.K.; Pandey, R.; Sharma, S.; Gayacharan; Kumar, T.; Singh, M.P.; Dikshit, H.K. Physiological Basis of Combined Stress Tolerance to Low Phosphorus and Drought in a Diverse Set of Mungbean Germplasm. Agronomy 2021, 11, 99. https://doi.org/10.3390/agronomy11010099

AMA Style

Meena SK, Pandey R, Sharma S, Gayacharan, Kumar T, Singh MP, Dikshit HK. Physiological Basis of Combined Stress Tolerance to Low Phosphorus and Drought in a Diverse Set of Mungbean Germplasm. Agronomy. 2021; 11(1):99. https://doi.org/10.3390/agronomy11010099

Chicago/Turabian Style

Meena, Surendra K.; Pandey, Renu; Sharma, Sandeep; Gayacharan; Kumar, Tarun; Singh, Madan P.; Dikshit, Harsh K. 2021. "Physiological Basis of Combined Stress Tolerance to Low Phosphorus and Drought in a Diverse Set of Mungbean Germplasm" Agronomy 11, no. 1: 99. https://doi.org/10.3390/agronomy11010099

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