Photosynthetic activity and metabolic profiling of bread wheat cultivars contrasting in drought tolerance

作者：Abdul Ghaffar, Nadeem Hussain, Rahaf Ajaj, Suzan Shahin, Hussan Bano, Muhammad Javed, Ayesha Khalid, Memoona Yasmin, Kausar Hussain Shah, Muhammad Saqlain Zaheer, Muhammad Iqbal, Zafar Ullah Zafar, Habib‐ur‐Rehman Athar · 发表于：Frontiers in Plant Science · 年份：2023 · DOI：10.3389/fpls.2023.1123080 · 被引用次数：35 · 研究领域：Plant Stress Responses and Tolerance、Plant responses to water stress、Plant Micronutrient Interactions and Effects

The rapid increase in population growth under changing climatic conditions causes drought stress, threatening world food security. The identification of physiological and biochemical traits acting as yield-limiting factors in diverse germplasm is pre-requisite for genetic improvement under water-deficit conditions. The major aim of the present study was the identification of drought-tolerant wheat cultivars with a novel source of drought tolerance from local wheat germplasm. The study was conducted to screen 40 local wheat cultivars against drought stress at different growth stages. Barani-83, Blue Silver, Pak-81, and Pasban-90 containing shoot and root fresh weight >60% of control and shoot and root dry weight >80% and 70% of control, respectively, P (% of control >80 in shoot and >88 in root), K + (>85% of control), and quantum yield of PSII > 90% of control under polyethylene glycol (PEG)-induced drought stress at seedling stage can be considered as tolerant, while more reduction in these parameters make FSD-08, Lasani-08, Punjab-96, and Sahar-06 as drought-sensitive cultivars. FSD-08 and Lasani-08 could not maintain growth and yield due to protoplasmic dehydration, decreased turgidity, cell enlargement, and cell division due to drought treatment at adult growth stage. Stability of leaf chlorophyll content (<20% decrease) reflects photosynthetic efficiency of tolerant cultivars, while ~30 µmol/g fwt concentration of proline,...