Pesquisa Agropecuária Brasileira | |
Salt tolerance and regulation of gas exchange and hormonal homeostasis by auxin-priming in wheat | |
Muhammad Iqbal2  Muhammad Ashraf1  | |
[1] ,College University Faisalabad Department of Botany Faisalabad,Pakistan | |
关键词: Triticum aestivum; hormonal balance; plant growth regulators; salinity; seed priming; stomatal regulation; Triticum aestivum; balanço hormonal; reguladores de crescimento; salinidade; condicionamento de sementes; regulação estomatal; | |
DOI : 10.1590/S0100-204X2013000900004 | |
来源: SciELO | |
【 摘 要 】
The objective of this work was to assess the regulatory effects of auxin-priming on gas exchange and hormonal homeostasis in spring wheat subjected to saline conditions. Seeds of MH-97 (salt-intolerant) and Inqlab-91 (salt-tolerant) cultivars were subjected to 11 priming treatments (three hormones x three concentrations + two controls) and evaluated under saline (15 dS m-1) and nonsaline (2.84 dS m-1) conditions. The priming treatments consisted of: 5.71, 8.56, and 11.42 × 10-4 mol L-1 indoleacetic acid; 4.92, 7.38, and 9.84 × 10-4 mol L-1 indolebutyric acid; 4.89, 7.34, and 9.79 × 10-4 mol L-1 tryptophan; and a control with hydroprimed seeds. A negative control with nonprimed seeds was also evaluated. All priming agents diminished the effects of salinity on endogenous abscisic acid concentration in the salt-intolerant cultivar. Grain yield was positively correlated with net CO2 assimilation rate and endogenous indoleacetic acid concentration, and it was negatively correlated with abscisic acid and free polyamine concentrations. In general, the priming treatment with tryptophan at 4.89 × 10-4 mol L-1 was the most effective in minimizing yield losses and reductions in net CO2 assimilation rate, under salt stress conditions. Hormonal homeostasis increases net CO2 assimilation rate and confers tolerance to salinity on spring wheat.
【 授权许可】
CC BY
All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License
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