Drought tolerance in Triticum aestivum L. genotypes associated with enhanced antioxidative protection and declined lipid
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ORIGINAL ARTICLE
Drought tolerance in Triticum aestivum L. genotypes associated with enhanced antioxidative protection and declined lipid peroxidation Deepali Upadhyay1,2 · Neeraj Budhlakoti4 · Amit Kumar Singh1 · Ruchi Bansal1 · Jyoti Kumari1 · Nidhee Chaudhary2 · Jasdeep Chatrath Padaria3 · Sindhu Sareen5 · Sundeep Kumar1 Received: 4 January 2020 / Accepted: 18 May 2020 © King Abdulaziz City for Science and Technology 2020
Abstract Drought is one of the major constraints in wheat production and causes a huge loss at grain-filling stage. In this study we highlighted the response of different wheat genotypes under drought stress at the grain-filling stage. Field experiments were conducted to evaluate 72 wheat (Triticum aestivum L.) genotypes under two water regimes: irrigated and drought condition. Four wheat genotypes, two each of drought tolerant (IC36761A, IC128335) and drought-susceptible category (IC335732 and IC138852) were selected on the basis of agronomic traits and drought susceptibility index (DSI), to understand their morphological, biochemical and molecular basis of drought stress tolerance. Among agronomic traits, productive tillers followed by biomass had high percent reduction under drought stress, thus drought stress had a great impact. Antioxidant activity (AO), total phenolic and proline content were found to be significantly higher in IC128335 genotype. Differential expression pattern of transcription factors of ten genes revealed that transcription factor qTaWRKY2 followed by qTaDREB, qTaEXPB23 and qTaAPEX might be utilized for developing wheat varieties resistant to drought stress. Understanding the role of TFs would be helpful to decipher the molecular mechanism involved in drought stress. Identified genotypes (IC128335 and IC36761A) may be useful as parental material for future breeding program to generate new drought-tolerant varieties. Keywords Antioxidant activity · Drought · DSI · SOD · Triticum aestivum · Wheat
Introduction
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13205-020-02264-8) contains supplementary material, which is available to authorized users. * Deepali Upadhyay [email protected] 1
ICAR-National Bureau of Plant Genetic Resources, Pusa Campus, New Delhi 110 012, India
2
Amity University Uttar Pradesh, Noida 201 313, India
3
ICAR-National Institute of Plant Biotechnology, Pusa campus, New Delhi 110 012, India
4
ICAR-Indian Agricultural Statistics Research Institute, New Delhi 110 012, India
5
ICAR-Indian Institute of Wheat and Barley Research, Karnal, Haryana 132 001, India
Plants encounter various kinds of abiotic stresses namely salinity, cold stress, heat stress and drought. These are the major stresses causing reduction in crop yield worldwide and is one of the major threat to food security due to continuous change of climate and environment deterioration caused by human interference. Whenever surrounding environmental conditions deviate from the optimum conditions required for the
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