Morphological and physiological responses of Heteropogon contortus to drought stress in a dry-hot valley

doi:10.1186/s40529-016-0131-0

	Morphological and physiological responses of Heteropogon contortus to drought stress in a dry-hot valley
	Wang, Xue-mei 1,2; Zhao, Li 3; Yan, Bang-guo 1,2; Shi, Liang-tao 4; Liu, Gang-cai 1; He, Yu-xiao 5
刊名	BOTANICAL STUDIES
	2016-08-08
卷号	57 页码:12
关键词	Heteropogon contortus Drought stress Biomass allocation Leaf water potential Relative water content Chlorophyll fluorescence
ISSN号	1999-3110
DOI	10.1186/s40529-016-0131-0
通讯作者	He, Yu-xiao(heyuxiao@hpu.edu.cn)
英文摘要	Background: Heteropogon contortus is a valuable pasture species that is widely used for vegetation restoration in dry-hot valleys of China. However, to date, its morphological and physiological responses to drought, and the underlying mechanisms are not well understood. This study was aimed to investigate the morphological and physiological changes of H. contortus under drought stress during the dry-hot season. Heteropogon contortus was planted in pots and subjected to four levels of soil water treatments: above 85 % (control), 70-75 % (light stress), 55-60 % (moderate stress) or 35-40 % (severe stress) of field capacity. Results: Within the total stress period (0-29 days), H. contortus grew rapidly in the light stress, whereas severe stress had a negative impact on growth. Aboveground biomass decreased together with increasing drought stress, whereas root biomass increased. Consequently, the root/shoot ratio of the severe stress treatment increased by 80 % compared to that of the control treatment. The ratio of bound water/free water (BW/FW) was the most sensitive parameter to drought and showed a value under severe stress that was 152.83 % more than that in the control treatment. Although leaf water potential (LWP) and leaf relative water content (RWC) decreased with progressive water stress, H. contortus managed to maintain a relatively high RWC (nearly 70 %) in the severe stress condition. We also detected a significant reduction (below 0.6) in the ratio of variable fluorescence/maximum fluorescence (Fv/Fm) in the severe stress treatment. Conclusions: Our results show that H. contortus adapts to drought mainly by avoidance mechanisms, and its morphological and physiological characteristics are inhibited under severe stress, but can recover at a certain time after re-watering. These findings might help limited water resources to be fully used for vegetation management in the studied region.
WOS关键词	WATER RELATIONS ; CHLOROPHYLL FLUORESCENCE ; GAS-EXCHANGE ; BIOCHEMICAL RESPONSES ; PENNISETUM-SETACEUM ; HAWAIIAN GRASS ; PLANT-GROWTH ; SEEDLINGS ; RESISTANCE ; RECOVERY
WOS研究方向	Plant Sciences
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000382388200001
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/66199]
专题	中国科学院地理科学与资源研究所
通讯作者	He, Yu-xiao
作者单位	1.Chinese Acad Sci & Minist Water Resources, Key Lab Mt Surface Proc & Ecol Regulat, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Southwest Univ Sci & Technol, Coll Environm & Resource Sci, Mianyang 621010, Peoples R China 4.Yunnan Acad Agr Sci, Inst Trop Ecoagr Sci, Yuanmou 651300, Yunnan Province, Peoples R China 5.Henan Polytech Univ, Inst Resources & Environm, Jiaozuo 454000, Henan, Peoples R China
推荐引用方式 GB/T 7714	Wang, Xue-mei,Zhao, Li,Yan, Bang-guo,et al. Morphological and physiological responses of Heteropogon contortus to drought stress in a dry-hot valley[J]. BOTANICAL STUDIES,2016,57:12.
APA	Wang, Xue-mei,Zhao, Li,Yan, Bang-guo,Shi, Liang-tao,Liu, Gang-cai,&He, Yu-xiao.(2016).Morphological and physiological responses of Heteropogon contortus to drought stress in a dry-hot valley.BOTANICAL STUDIES,57,12.
MLA	Wang, Xue-mei,et al."Morphological and physiological responses of Heteropogon contortus to drought stress in a dry-hot valley".BOTANICAL STUDIES 57(2016):12.