Morphological and physiological responses of Heteropogon contortus to drought stress in a dry-hot valley
文献类型：期刊论文
| 作者 | Wang, Xue-mei1,2; Zhao, Li3; Yan, Bang-guo1,2; Shi, Liang-tao4; Liu, Gang-cai1; He, Yu-xiao5 |
| 刊名 | BOTANICAL STUDIES
 |
| 出版日期 | 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 |
| WOS记录号 | WOS:000382388200001 |
| 出版者 | SPRINGER |
| 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. |
入库方式： OAI收割
来源：地理科学与资源研究所
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