干旱区生态环境知识资源中心(Arid): Dynamic responses of Haloxylon ammodendron to various degrees of simulated drought stress

Arid

DOI	10.1016/j.plaphy.2019.03.019
	Dynamic responses of Haloxylon ammodendron to various degrees of simulated drought stress
	Lu, Xin-Pei ; Gao, Hui-Juan ; Zhang, Ling ; Wang, Yong-Ping ; Shao, Kun-Zhong ; Zhao, Qi ; Zhang, Jin-Lin 1
通讯作者	Zhang, Jin-Lin
来源期刊	PLANT PHYSIOLOGY AND BIOCHEMISTRY
ISSN	0981-9428
出版年	2019
卷号	139 页码:121-131
英文摘要	Haloxylon ammodendron, a C4 perennial, succulent and xero-halophytic shrub, is highly resistant to harsh environments, therefore, exploring the stress resistance mechanism will be beneficial for the use of xerophytes to prevent desertification. To determine osmotic adjustment (OA) and antioxidase functions under simulated drought stress, 8-week-old seedlings were treated with sorbitol solutions to maintain osmotic potentials (Psi s) at a control and -0.5 and -1.0 MPa. Under -0.5 MPa osmotic stress, H. ammodendron stably maintained the water content of assimilating branches, a result that was not significantly different from the result of the control group. Moreover, the Psi s decreased significantly, which helped plants absorb water efficiently from the environment, as H. ammodendron accumulated massive osmotic regulators in its assimilating branches to adjust shoot Psi s. Specifically, the contribution of Na+ to shoot Psi s was up to 45%, and Na+ became the main osmotic regulator of OA. During the treatments, the content and contribution of K+ remained stable. However, the total contribution of three organic osmotic regulators (free proline, betaine and soluble sugar) was only 20%, and betaine was the main organic osmotic regulator, accounting for approximately 15% of the 20% contribution. Moreover, H. ammodendron seedlings presented strong antioxidases, especially when there was a high activity level of superoxide dismutase, and with an increase in treatment time and degree of osmotic stress, the activity of peroxidase and catalase increased significantly. Substantial accumulation of osmotic adjustment substances was an important strategy for H. ammodendron to cope with simulated drought stress, in particular, H. ammodendron absorbed much Na+ and transported Na+ into the assimilating branch for OA. The scavenging of reactive oxygen species by antioxidases was another adaptation strategy for H. ammodendron to adapt to simulated drought stress.
英文关键词	Haloxylon ammodendron Simulated drought stress Osmotic regulators Na+ Antioxidase
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000469896200012
WOS关键词	WATER-DEFICIT TOLERANCE ; OSMOTIC ADJUSTMENT ; ABIOTIC STRESS ; SODIUM-CHLORIDE ; SALT-TOLERANCE ; PHYSIOLOGICAL ADJUSTMENT ; PROLINE ACCUMULATION ; POTASSIUM-TRANSPORT ; ANTIOXIDANT ENZYMES ; K+/NA+ HOMEOSTASIS
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218047
作者单位	1.Lanzhou Univ, State Key Lab Grassland Agroecosyst, Lanzhou 730000, Gansu, Peoples R China; 2.Lanzhou Univ, Minist Agr & Rural Affairs, Key Lab Grassland Livestock Ind Innovat, Lanzhou 730000, Gansu, Peoples R China; 3.Lanzhou Univ, Minist Educ, Engn Res Ctr Grassland Ind, Lanzhou 730000, Gansu, Peoples R China; 4.Lanzhou Univ, Coll Pastoral Agr Sci & Technol, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Lu, Xin-Pei,Gao, Hui-Juan,Zhang, Ling,et al. Dynamic responses of Haloxylon ammodendron to various degrees of simulated drought stress[J]. 兰州大学,2019,139:121-131.
APA	Lu, Xin-Pei.,Gao, Hui-Juan.,Zhang, Ling.,Wang, Yong-Ping.,Shao, Kun-Zhong.,...&Zhang, Jin-Lin.(2019).Dynamic responses of Haloxylon ammodendron to various degrees of simulated drought stress.PLANT PHYSIOLOGY AND BIOCHEMISTRY,139,121-131.
MLA	Lu, Xin-Pei,et al."Dynamic responses of Haloxylon ammodendron to various degrees of simulated drought stress".PLANT PHYSIOLOGY AND BIOCHEMISTRY 139(2019):121-131.