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Morphological and physiological responses of Heteropogon contortus to drought stress in a dry-hot valley
Wang,Xue-mei1,2; Zhao,Li3; Yan,Bang-guo1,2; Shi,Liang-tao4; Liu,Gang-cai1; He,Yu-xiao5
AbstractAbstractBackgroundHeteropogon 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.ResultsWithin 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.ConclusionsOur 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.
KeywordHeteropogon contortus Drought stress Biomass allocation Leaf water potential Relative water content Chlorophyll fluorescence
Indexed BySCI
WOS IDBMC:10.1186/s40529-016-0131-0
PublisherSpringer Berlin Heidelberg
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Document Type期刊论文
Corresponding AuthorHe,Yu-xiao
Affiliation1.Chinese Academy of Sciences and Ministry of Water Resources; Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment
2.University of Chinese Academy of Sciences
3.Southwest University of Science and Technology; College of Environment and Resource Science
4.Yunnan Academy of Agricultural Sciences; Institute of Tropical Eco-agricultural Sciences
5.He’nan Polytechnic University; Institute of Resources and Environment
Recommended Citation
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(1).
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(1).
MLA Wang,Xue-mei,et al."Morphological and physiological responses of Heteropogon contortus to drought stress in a dry-hot valley".BOTANICAL STUDIES 57.1(2016).
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