Changes of early seedling growth and physiological and biochemical indexes of two wheat species under salt stress

doi:10.14088/j.cnki.issn0439-8114.2021.15.005

Abstract

Abstract: The changes of seedling growth and corresponding physiological and biochemical indexes of salt tolerant wheat variety Xindong 26 and salt sensitive wheat variety E'en 1 under salt stress were studied to provide basis for subsequent breeding of salt tolerant varieties. The results showed that under salt stress, the root length, bud length, dry weight and fresh weight of Xindong 26 and E'en 1 decreased with the increase of salt concentration, while the corresponding indexes of Xindong 26 decreased less than E'en 1; The activities of SOD, CAT and POD increased with the increase of salt concentration. The activity of Xindong 26 was higher than that of E'en 1. At the same concentration, the activity of SOD first increased and then decreased with the extension of stress time, but the activity of Xindong 26 was higher than that of E'en 1; The content of proline and MDA increased with the increase of salt concentration. The content of proline in Xindong 26 was higher than that in E'en 1, and the content of MDA was lower than that in E'en 1. At the same concentration, with the extension of stress time, the content of proline first increased and then decreased, while the content of MDA continued to rise. The content of proline in Xindong 26 was higher than that in E'en 1, and the content of MDA was lower than that in E'en 1, Xindong 26 could maintain cell homeostasis and cell membrane stability, and showed better salt tolerance. The salt tolerant varieties grew better than the sensitive varieties under salt stress, had higher antioxidant enzyme activities, accumulated more proline to maintain cell homeostasis, and the salt tolerant varieties had lower degree of cell membrane damage and stronger salt tolerance.

Key words: wheat, salt stress, antioxidant protective enzymes, proline, MDA

CLC Number:

S512.1⁺¹

XIAO Dong-yu, WU Duan-yang, WEN Xue, ZHOU Lan, HE Hong-chao, WANG Yan-yan. Changes of early seedling growth and physiological and biochemical indexes of two wheat species under salt stress[J]. HUBEI AGRICULTURAL SCIENCES, 2021, 60(15): 29-33.

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