Impact of salt-induced toxicity on growth and yield-potential of local wheat cultivars: oxidative stress and ion toxicity are among the major determinants of salt-tolerant capacity.

Autor: Siddiqui MN; Department of Biochemistry and Molecular Biology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, 1706, Bangladesh., Mostofa MG; Department of Biochemistry and Molecular Biology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, 1706, Bangladesh. Electronic address: mostofa@bsmrau.edu.bd., Akter MM; Director (Research) Office, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, 1706, Bangladesh., Srivastava AK; Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre, Mumbai, 400085, India., Sayed MA; Department of Biochemistry and Molecular Biology, Hajee Mohammad Danesh Science and Technology University, Dinajpur, 5200, Bangladesh., Hasan MS; Department of Plant Pathology, Hajee Mohammad Danesh Science and Technology University, Dinajpur, 5200, Bangladesh., Tran LP; Plant Stress Research Group & Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Viet Nam; Signaling Pathway Research Unit, RIKEN Center for Sustainable Resource Science, Yokohama, Japan. Electronic address: sontran@tdt.edu.vn.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2017 Nov; Vol. 187, pp. 385-394. Date of Electronic Publication: 2017 Aug 18.
DOI: 10.1016/j.chemosphere.2017.08.078
Abstrakt: High salinity is a major constraint for wheat productivity in many countries, including Bangladesh. Here, we examined the effects of salt-induced toxicity on growth and production of 10 local wheat cultivars by analyzing physiological, biochemical and agronomical responses to identify the salt-tolerant attributes among the contrasting genotypes. Results of cluster analyses based on salt tolerance indices of plant growth-related and yield-contributing parameters, ionic balance (Na + , K + and Na + /K + ratio), and stress indicators (SPAD values and proline) revealed Gourab and Shatabdi as salt-sensitive, BARI Gom 27 and 28 as salt-tolerant and the other six examined varieties as moderately salt-tolerant cultivars. Hierarchical clustering and principle component analyses also demonstrated BARI Gom 27 and 28 as the highest salt-tolerant cultivars, especially in terms of Na + /K + ratio and proline level. Additionally, lower accumulations of hydrogen peroxide and malondialdehyde, and higher activities of antioxidant enzymes catalase, peroxidase and ascorbate peroxidase in the salt-tolerant BARI Gom 28 than in the salt-sensitive Gourab indicated reduced oxidative damage in BARI Gom 28 relative to that in Gourab. Collectively, our findings suggest that the optimum growth and yield of salt-tolerant cultivars are associated with decreased Na + /K + ratio, increased proline level and reduced oxidative stress. Furthermore, BARI Gom 27 and 28 could be suggested as suitable cultivars for cultivation in salt-affected areas, and the contrasting salt-responsive genotypes can be used as valuable genetic resources in breeding and dissection of molecular mechanisms underlying wheat adaptation to high salinity.
(Copyright © 2017 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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