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Exogenous 24-epibrassinolide promoted growth and nitrogen absorption and assimilation efficiency of apple seedlings under salt stress

文献类型： 外文期刊

作者： Yu, Bo 1 ; Wang, Laiping 1 ; Guan, Qiuzhu 1 ; Xue, Xiaomin 1 ; Gao, Wensheng 3 ; Nie, Peixian 1 ;

作者机构： 1.Shandong Inst Pomol, Shandong Key Lab Fruit Biotechnol Breeding, Tai An, Peoples R China

2.Shenyang Agr Univ, Coll Hort, Shenyang, Peoples R China

3.Shandong Agr Technol Extens Ctr, Shandong Prov Dept Agr & Rural Affairs, Jinan, Peoples R China

关键词： 24-epibrassinolide; NaCl stress; C and N assimilation; NUE

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.6； 五年影响因子：6.8 ）

ISSN： 1664-462X

年卷期： 2023 年 14 卷

页码：

收录情况： SCI

摘要： Introduction: High salinity significantly hampers global agricultural productivity. Plants typically undergo lower nitrogen utilization efficiency (NUE) under salt stress. As an active byproduct from brassinolide biosynthesis, 24-epibrassinolide (EBR) is involved in regulating the stress-treated plant N absorption and assimilation. However, the exogenous EBR application effects' on N absorption and assimilation in apple exposed to the salt-stressed condition remains unclear.Methods: We sprayed exogenous EBR (0.2 mg L-1) on apple dwarf rootstock (M9T337) seedlings (growing hydroponically) under salt (NaCl) stress in a growth chamber. We analyzed the seedling development, photosynthesis and its-mediated C fixation, N ( NO 3 - ) absorption and assimilation in reponse to exogenous EBR application under salt stress.Results: The findings demonstrated that NaCl stress greatly hampered seedlings' root growth and that exogenous EBR application obviously alleviated this growth suppression. Exogenous EBR-treated plants under NaCl stress displayed the more ideal root morphology and root activity, stronger salt stress tolerance and photosynthetic capacity as well as higher C- and N-assimilation enzyme activities, NO 3 - ion flow rate and nitrate transporter gene expression level than did untreated plants. Furthermore, the results of isotope labeling noted that exogenous EBR application also enhanced C-13-photoassimilate transport from leaves to roots and (15) NO 3 - transport from roots to leaves under NaCl stress.Conclusion: Our findings imply that exogenous EBR application, through strengthening photosynthesis, C- and N-assimilation enzyme activities, nitrate absorption and transport as well as synchronized optimizing the distribution of seedlings' C and N, has a fundamental role in improving NUE in apple rootstock seedlings under salt stress.

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