Abstract
This investigation was done to assess the role of abscisic acid (ABA; 25 µM) and/or nitrogen (N; 10 mM) in the alleviation of salinity (NaCl; 100 mM)-induced reduction in photosynthetic activity and growth, N and sulfur (S) assimilation of mustard (Brassica juncea L.) cv. RH0-749. Salinity treatment caused oxidative stress and significantly elevated the content of both H2O2 and thiobarbituric acid reactive substances (TBARS), and impaired photosynthetic activity and growth, but increased the content of nitrogenous osmolyte proline and the activity of antioxidant enzymes involved in the metabolism of reactive oxygen species. The application of 25 µM ABA under a controlled condition negatively affected photosynthesis and growth. However, ABA, when combined with N, minimized oxidative stress and mitigated the salinity-inhibited effects by increasing the activity of antioxidant enzymes (superoxide dismutase, SOD; glutathione reductase, GR; ascorbate peroxidase, APX) and proline content. Overall, the supplementation of 10 mM N combined with 25 µM ABA provides an important strategy for enhancing the photosynthetic potential of B. juncea under saline conditions.
Highlights
IntroductionOilseed crops crops play play aa prominent prominent role role in in agricultural agricultural industries industries and and trade trade throughout throughoutOilseed the world [1].The edible oilseed crop, Indian mustard (Brassica junceaL.), stands second the world [1]
In the presence of NaCl (100 mM), photosynthetic and growth parameters were favorably influenced by exogenously supplied abscisic acid (ABA) when compared to the NaCl-stressed plants
The content of Na+ and Cl− in both the leaves and roots of plants was analyzed to determine the potential of 25 μM ABA along with 10 mM N in modulating the ion accumulation NaCl (100 mM)-exposed B. juncea plants
Summary
IntroductionOilseed crops crops play play aa prominent prominent role role in in agricultural agricultural industries industries and and trade trade throughout throughoutOilseed the world [1].The edible oilseed crop, Indian mustard (Brassica junceaL.), stands second the world [1]. The edible oilseed crop, Indian mustard (Brassica juncea L.), stands secto peanuts; accounts for of the country’s oilseed economy; and is cultivated ond to peanuts; accounts for 27.8% of the country’s oilseed economy; and is cultivated throughout the the northern northern Indian. Most most of of its its cultivation cultivation depends depends throughout on groundwater sources varying from medium to high salinity levels [3]. The exogenous supplementation of Oilseed crops play a prominent role in agricultural ind GSH improved salt Received: 28 Julystress. M on groundwater varying from medium to high sa Improvement in stays the Photosynthetic and Growthsources. Photosynthetic and growth parameters are among the major negatively parametersaffects at the whole claims in published maps and instiand semi-arid regions of the world
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