期刊
AGRICULTURAL WATER MANAGEMENT
卷 188, 期 -, 页码 29-35出版社
ELSEVIER
DOI: 10.1016/j.agwat.2017.04.001
关键词
Gas exchange; SCMR; Water stress; Helianthus tuberosus L.
资金
- Higher Education Research Promotion and National Research University Project of Thailand
- Office of the Higher Education Commission, through the Food and Functional Food Research Cluster of Khon Kaen University, Thailand
- Thailand Research Fund [RTA 5880003, IRG 5780003]
- Khon Kaen University and Faculty of Agriculture, KKU
The impact of water stress on plant growth, tuber yield and inulin content has been widely studied but there is limited information on the effect of drought on photosynthetic characteristics. Therefore, this study was to investigate the effect of water stress on photosynthetic characteristics in Jerusalem artichoke genotypes with different levels of drought tolerance. Two experiments were conducted in rhizobox under greenhouse conditions during August to October in 2015 and 2016. A factorial experiment in randomized complete block design with three replications was used. Factor A were two water regimes (irrigated = field capacity; (FC) and water stress) and factor B were three Jerusalem artichoke genotypes. Data were recorded for relative water content, SPAD chlorophyll meter reading (SCMR), photosynthetic characteristics and water use efficiency (WUE) at 7 and 30 days after imposing drought. Leaf area and dry matter was recorded at 30 days after imposing drought. Our results revealed that drought caused a greater reduction in stomatal conductance (g(s)), net photosynthetic rate (P-n), leaf area and biomass production than in other traits measured. In contrast, WUE and SCMR were increased under drought conditions. However, g(s) and P-n decreases were less in resistant Jerusalem artichoke genotypes than in susceptible genotypes. Also, resistant genotypes had higher WUE increases than susceptible genotypes. Improved P-n combined with high WUE could contribute to higher biomass production. Interestingly, SCMR was associated with P-n and this trait could be used as surrogate trait for improved P-n under drought conditions. (C) 2017 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据