外源钙对低温胁迫下西藏野生垂穗披碱草生理及相关基因表达的影响

doi:10.11733/j.issn.1007-0435.2021.05.008

草地学报 ›› 2021, Vol. 29 ›› Issue (5): 919-928.DOI: 10.11733/j.issn.1007-0435.2021.05.008

外源钙对低温胁迫下西藏野生垂穗披碱草生理及相关基因表达的影响

其美拉姆¹, 普布卓玛², 崔彤彤¹, 张新飞¹, 姜惠娜¹, 付娟娟¹, 呼天明¹

1. 西北农林科技大学草业与草原学院, 陕西杨凌 712100;
2. 西藏自治区农科院草业科学研究所, 西藏拉萨 850000

收稿日期:2020-11-22 修回日期:2021-01-01 出版日期:2021-05-15 发布日期:2021-06-02
通讯作者: 付娟娟,E-mail:fujuanjuan1234@126.com;呼天明,E-mail:hutianming@126.com
作者简介:其美拉姆(1992-)，女，藏族，西藏昌都人，硕士研究生，主要从事植物逆境生物学研究，E-mail：1051927567@qq.com
基金资助:
国家自然科学面上项目（31872411）；国家自然科学基金项目（31901382）；西藏自治区科技计划项目（XZ202001ZY0016N）；陕西省重点研发计划（NO.2021NY-003）共同资助

Effects of Exogenous Calcium on Physiology and Related Gene Expression of Elymus nutans under Cold Stress

QIMEI La-mu¹, PUBU Zhuo-ma², CUI Tong-tong¹, ZHANG Xin-fei¹, JIANG Hui-na¹, FU Juan-juan¹, HU Tian-Ming¹

1. Department of Grassland Science, College of Animal Sinece and Technology, Northwest A&F University, Yang ling, Shaanxi Province 712100, China;
2. Tibet Academy of Agriculture and Animal Husbandry Scineces, Lhasa, Tibet 850000, China

Received:2020-11-22 Revised:2021-01-01 Online:2021-05-15 Published:2021-06-02

摘要/Abstract

摘要： 为探究Ca²⁺调控西藏野生垂穗披碱草（Elymus nutans）适应低温的生理和分子响应机制，本研究采用叶面喷施外源CaCl₂的方法，研究其对当雄野生垂穗披碱草表型，生物量，电解质渗透率、活性氧、丙二醛、渗透调节物质含量以及抗氧化酶活性的影响。结果表明，喷施15 mM CaCl₂有效地缓解低温对垂穗披碱草幼苗的生长抑制；CaCl₂处理显著提高低温胁迫下垂穗披碱草地上/地下生物量，降低丙二醛和活性氧的积累，提高可溶性糖和游离脯氨酸的含量及过氧化物酶、过氧化氢酶、超氧化物歧化酶、抗坏血酸过氧化氢酶等抗氧化酶活性。RT-qPCR结果表明，外源CaCl₂能上调EnAPX，EnCAT2，EnGPX，EnGST4，EnMDAR，EnPER1，EnCu/ZnSOD，EnFeSOD，EnMnSOD抗氧化酶基因的表达水平，同时上调胁迫相关基因EnCOR410，EnCS120，EnDHN5和EnMYB4的表达。综上，低温胁迫下适宜浓度的Ca²⁺能够激活抗氧化酶活性，及时清除过量积累的活性氧，缓解低温对西藏野生垂穗披碱草细胞膜系统造成的氧化伤害，提高细胞渗透调节能力，并且能够诱导胁迫相关基因的表达，从而提高垂穗披碱草的抗寒性。

关键词: 垂穗披碱草, 低温胁迫, 钙, 渗透调节物质, 基因表达

Abstract: In the present study,we used Damxung wild Elymus nutans as the material to investigate the physiological and molecular mechanism of exogenous CaCl₂ mediating cold tolerance. The effects of CaCl₂ on above and below-ground biomass,electrolyte permeability,reactive oxygen species,malondialdehyde,osmotic adjustment substances,and antioxidant protective enzyme activities in the leaves of the E. nutans plants were measured. The results showed that exogenous 15 mM CaCl₂ application increased the above and below-ground biomass,the content of soluble sugars and free proline,improved POD,CAT,SOD,APX activities,and decreased the accumulation of malondialdehyde content under cold stress. An RT-qPCR data displayed that exogenous CaCl₂ significantly induced the expression levels of nine antioxidant enzyme genes,including EnAPX,EnCAT2,EnGPX,EnGST4,EnMDAR,EnPER1,EnCu/ZnSOD,and EnFeSOD,EnMnSOD, and up-regulated the expression level of stress-related genes such as EnCOR410,EnCS120, EnDHN5,and EnMYB4. These results indicated that appropriate concentration of Ca²⁺ could alleviate the damage induced by cold stress in the leaves of E. nutans via improving the activities of antioxidant enzyme and the contents of osmoregulation substances,scavenging the excessive accumulation of reactive oxygen species,and up-regulating the expression of the genes involved in some antioxidant enzymes and cold stress-related response.

Key words: Elymus nutans, Cold stress, Calcium, Osmotic regulators, Gene expression

中图分类号:

其美拉姆, 普布卓玛, 崔彤彤, 张新飞, 姜惠娜, 付娟娟, 呼天明. 外源钙对低温胁迫下西藏野生垂穗披碱草生理及相关基因表达的影响[J]. 草地学报, 2021, 29(5): 919-928.

QIMEI La-mu, PUBU Zhuo-ma, CUI Tong-tong, ZHANG Xin-fei, JIANG Hui-na, FU Juan-juan, HU Tian-Ming. Effects of Exogenous Calcium on Physiology and Related Gene Expression of Elymus nutans under Cold Stress[J]. Acta Agrestia Sinica, 2021, 29(5): 919-928.

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外源钙对低温胁迫下西藏野生垂穗披碱草生理及相关基因表达的影响

Effects of Exogenous Calcium on Physiology and Related Gene Expression of Elymus nutans under Cold Stress

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