干旱区生态环境知识资源中心(Arid): Mild water and salt stress improve water use efficiency by decreasing stomatal conductance via osmotic adjustment in field maize

Arid

DOI	10.1016/j.scitotenv.2021.150364
	Mild water and salt stress improve water use efficiency by decreasing stomatal conductance via osmotic adjustment in field maize
	Liao, Qi; Gu, Shujie; Kang, Shaozhong; Du, Taisheng; Tong, Ling; Wood, Jeffrey D.; Ding, Risheng
通讯作者	Ding, RS (corresponding author), China Agr Univ, Ctr Agr Water Res China, Beijing 100083, Peoples R China.
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2022
卷号	805
英文摘要	Water and salt stress often occur simultaneously in heavily irrigated arid agricultural areas, yet they are usually studied in isolation. To understand the physiological bases of water use efficiency (WUE) of field-grown maize (Zea mays) at multi-scales under combined water and salt stress, we investigated the joint effects of water and salt stress on physiology, growth, yield, and WUE of two genotypes (XY335 and ZD958). We measured leaf stomatal conductance (gs), net photosynthesis rate (A) and hydraulic traits, whole-plant growth and water use (ET), and final biomass and grain yield. Leaf osmotic adjustment was a key trait of the physiological differences between XY335 and ZD958 under water and salt stress. Although the responses of the two genotypes were different, mild water and salt stress improved intrinsic water use efficiency (iWUE = A/g(s)) by (i) decreasing gs via increasing osmotic adjustment and hydraulic resistance, and (ii) declining A via increasing stomatal limitations rather than reducing photosynthetic capacity. Joint water and salt stress had a synergistic effect on reproductive growth and grain formation of maize. Mild water and salt stress reduced ET, stabilized grain yield, and improved grain WUE via declining gs, maintaining photosynthetic capacity, and improving harvest index. Collectively, our study provides a novel insight into the physiological mechanisms of WUE and demonstrates an approach for the efficient management of water and salt by using a growth stage-based deficit irrigation strategy or/and selecting genotypes with strong osmotic adjustment capacity and high harvest index. (C) 2021 Elsevier B.V. All rights reserved.
英文关键词	Water and salt stress Water use efficiency Stomatal conductance Photosynthesis Osmotic adjustment Hydraulic conductance
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000704389300012
WOS关键词	ZEA-MAYS L. ; DROUGHT STRESS ; HYDRAULIC CONDUCTANCE ; DEFICIT IRRIGATION ; PLANT-RESPONSES ; GAS-EXCHANGE ; SALINE WATER ; ABIOTIC STRESS ; SOIL-SALINITY ; SPRING MAIZE
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
来源机构	中国农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/364623
作者单位	[Liao, Qi; Gu, Shujie; Kang, Shaozhong; Du, Taisheng; Tong, Ling; Ding, Risheng] China Agr Univ, Ctr Agr Water Res China, Beijing 100083, Peoples R China; [Liao, Qi; Gu, Shujie; Kang, Shaozhong; Du, Taisheng; Tong, Ling; Ding, Risheng] Minist Educ, Minist Agr & Rural Affairs, Shiyanghe Expt Stn Improving Water Use Efficiency, Wuwei 733009, Gansu, Peoples R China; [Liao, Qi; Gu, Shujie; Kang, Shaozhong; Du, Taisheng; Tong, Ling; Ding, Risheng] Gansu Govt, Wuwei 733009, Gansu, Peoples R China; [Wood, Jeffrey D.] Univ Missouri, Sch Nat Resources, Columbia, MO 65211 USA
推荐引用方式 GB/T 7714	Liao, Qi,Gu, Shujie,Kang, Shaozhong,et al. Mild water and salt stress improve water use efficiency by decreasing stomatal conductance via osmotic adjustment in field maize[J]. 中国农业大学,2022,805.
APA	Liao, Qi.,Gu, Shujie.,Kang, Shaozhong.,Du, Taisheng.,Tong, Ling.,...&Ding, Risheng.(2022).Mild water and salt stress improve water use efficiency by decreasing stomatal conductance via osmotic adjustment in field maize.SCIENCE OF THE TOTAL ENVIRONMENT,805.
MLA	Liao, Qi,et al."Mild water and salt stress improve water use efficiency by decreasing stomatal conductance via osmotic adjustment in field maize".SCIENCE OF THE TOTAL ENVIRONMENT 805(2022).