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Differential response of Indian mustard (Brassica juncea L., Czern and Coss) under salinity: photosynthetic traits and gene expression

Author:
Singh, Jogendra, Singh, Vijayata, Vineeth, T. V., Kumar, Parveen, Kumar, Neeraj, Sharma, Parbodh C.
Source:
Physiology and molecular biology of plants 2019 v.25 no.1 pp. 71-83
ISSN:
0971-5894
Subject:
Brassica juncea, antioxidants, antiporters, gene overexpression, genes, genotype, high-yielding varieties, irrigation water, mutants, photosynthesis, roots, salt stress, salt tolerance, shoots, sodium, water salinity
Abstract:
To explore the effect of salt stress on photosynthetic traits and gene expression in Indian mustard, four genotypes CS 54 (national check for salinity), CS 52-SPS-1-2012 (salt tolerant mutant), CS 614-4-1-4-100-13 (salt sensitive mutant) and Pusa bold (high yielding variety) were evaluated under irrigation water salinity (ECᵢw 12, and 15 dS m⁻¹). Results suggest genotype CS 52-SPS-1-2012 followed by CS 54 performed better under imposed salt stress due to differential regulation of Na⁺ accumulation in the roots and main stem, restriction of Na⁺ influx from root to shoot, maintaining higher net photosynthetic traits under saline stress compared to CS 614-4-1-4-100-13 and Pusa bold. Further, overexpression of antiporters (SOS1, SOS2, SOS3, ENH1 and NHX1) and antioxidant (APX1, APX4, DHAR1 and MDHAR) genes in salt tolerant genotypes CS 52-SPS-1-2012 and CS 54 demonstrated their significant role in imparting salt tolerance in Indian mustard.
Agid:
6280015