期刊
ENVIRONMENTAL TECHNOLOGY & INNOVATION
卷 24, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.eti.2021.101808
关键词
Abscisic acid; Gas exchange attributes; Photosynthetic pigments; Oxidative injury; Antioxidant metabolism; Ion uptake
资金
- Department of Soil Science, The Islamia University of Bahawalpur, Pakistan
The study demonstrated that root-zone application of ABA improved salt tolerance in wheat seedlings by reducing salt-induced damage, promoting growth and development, and regulating antioxidant responses.
Salinity, one of the catastrophic abiotic stresses that uces wheat production around the globe. Abscisic acid (ABA) is a stress phytohormone as a signaling molecule that led us to investigate its potential to improve morpho-physiological characteristics, antioxidant metabolism, and ion homeostasis in wheat (Triticum aestivum L.) seedlings grown under salinity stress (0, 50, and 100 mM NaCl). The findings suggested that salt-induced toxicity significantly (P < 0.05) damaged root morphological characteristics, plant growth, photosynthetic pigments, and water contents, while trigger the oxidative injury, Na+ ion accumulation and uptake in wheat leaf and root tissues with the increasing NaCl concentration in the nutrient media. However, root-zone supply of ABA (0, 5, and 10 mu M) prominently alleviated salt induced phytotoxicity. The 10 mu M concentration of ABA promoted shoot (81.7%) and root (102.1%) dry weight, root length (38.2%), Chl. a (65.3%), Chl. b (149.0%), carotenoids (95.7%) and membrane damage (36.7%) when NaCl was added at 100 mM, relative to the corresponding treatment without ABA. Moreover, ABA (10 mu M) supply decreased Na+ ion uptake (root to leaf) due to reduced transpiration rate (81.1%), and thereby ameliorated oxidative injury by ucing leaf malondialdehyde (MDA) and H2O2 contents by 36.8% and 29.9%, respectively, at 100 mM NaCl stress, relative to the similar treatment without ABA. In addition, the activities of catalase (CAT), superoxide dismutase (SOD), and ascorbate peroxidase (APX) were upregulated by 143.9%, 20.2%, and 19.5% in leaves and by 144.9%, 23.4% and 41.1% in roots respectively, with 10 mu M ABA application under 100 mM salinity stress, compa to the 100 mM NaCl treatment without ABA. Conclusively, this study proposed that root-zone ABA application promoted salinity tolerance in wheat seedlings and could be a practical approach for wheat production in salt-affected regions to ensure food security. (C) 2021 Elsevier B.V. All rights reserved.
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