The effect of salt stress on sugar and endogenous hormone content in oat varieties with contrasting salt tolerance

doi:10.11686/cyxb2025154

Abstract

Abstract:

Soil salinization affects crop growth and development through salt stress， and exploring the physiological mechanisms of oat （Avena sativa） salt tolerance is of great significance for managing salinization. The salt tolerant ‘Qingyongjiu 461’ and salt sensitive ‘Qingyin No. 2’ oat varieties were compared in this research， and changes in sugar substances and endogenous hormone content in leaves and roots of plants under salt stress were quantified to elucidate the response characteristics of the two materials in the sugar metabolism pathway and hormone regulation network. The results showed that under salt stress， the contents of starch and sucrose in the leaves of both oat varieties decreased， while glucose and fructose increased. Hence， under salt stress， the contents of glucose and fructose in the leaves of the salt-sensitive material ‘Qingyin No. 2’ were， respectively， 1.60 and 1.59 times those of ‘Qingyongjiu 461’. In addition， under salt stress， both oat varieties synthesized and accumulated abscisic acid （ABA） in their leaves and roots， which led to a decrease in the ratios of indole-3-acetic acid （IAA）∶ABA and zeatin （ZA）∶ABA. Meanwhile， salt stress regulated the upward transport of 12-oxo phytodienoic acid （OPDA） from the roots， resulting in the accumulation of OPDA in the leaves， thereby promoting stomatal closure in oats to adapt to salt stress. The salt-tolerant oat ‘Qingyongjiu 461’ was able to accumulate more IAA in its tissues and promote the biosynthesis of SA in leaves to resist salt stress under saline conditions. In contrast， the salt-sensitive oat ‘Qingyin No. 2’ responded to salt stress by accumulating higher levels of ZA in its leaves while regulating the conversion of jasmonic acid to jasmonic acid-isoleucine within the plant. This study identifies the similarities and differences in carbon allocation strategies and hormone interaction networks between two oat genotypes with contrasting salt tolerance levels， providing elucidation of the physiological basis of the salt tolerance mechanisms of oats.

Key words: oats, salt stress, sugar content, endogenous hormones, physiological response

Xiang MA, Zhong-xing LI, Rong-chen YANG, Ze-liang JU, Zhi-feng JIA, Pei-zhi YANG. The effect of salt stress on sugar and endogenous hormone content in oat varieties with contrasting salt tolerance[J]. Acta Prataculturae Sinica, 2026, 35(3): 235-244.

Figures/Tables 4

Fig.1 Effects of salt stress on starch and soluble sugar content in ‘Qingyongjiu 461’ and ‘Qingyin No.2’

Fig.2 Effects of salt stress on the contents of IAA， ZA， SA and ABA in ‘Qingyongjiu 461’ and ‘Qingyin No.2’

Fig.3 Effects of salt stress on the contents of JA， JA-Ile and OPDA in ‘Qingyongjiu 461’ and ‘Qingyin No.2’

Fig.4 Effects of salt stress on ZA/IAA， ZA/ABA和IAA/ABA in ‘Qingyongjiu 461’ and ‘Qingyin No.2’

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