期刊
PLANT CELL AND ENVIRONMENT
卷 37, 期 7, 页码 1598-1613出版社
WILEY
DOI: 10.1111/pce.12260
关键词
carbohydrates; drought; elevated temperature; eucalyptus; hydraulic failure; rising [CO2]
资金
- Australian Research Council [LP0989881, DP110105102]
- University of Western Sydney
- CSIRO Ecosystem Science, Sustainable Agriculture National Research Flagship
- Australian Research Council [LP0989881] Funding Source: Australian Research Council
It has been reported that elevated temperature accelerates the time-to-mortality in plants exposed to prolonged drought, while elevated [CO2] acts as a mitigating factor because it can reduce stomatal conductance and thereby reduce water loss. We examined the interactive effects of elevated [CO2] and temperature on the inter-dependent carbon and hydraulic characteristics associated with drought-induced mortality in Eucalyptus radiata seedlings grown in two [CO2] (400 and 640 mu L L-1) and two temperature (ambient and ambient +4 degrees C) treatments. Seedlings were exposed to two controlled drying and rewatering cycles, and then water was withheld until plants died. The extent of xylem cavitation was assessed as loss of stem hydraulic conductivity. Elevated temperature triggered more rapid mortality than ambient temperature through hydraulic failure, and was associated with larger water use, increased drought sensitivities of gas exchange traits and earlier occurrence of xylem cavitation. Elevated [CO2] had a negligible effect on seedling response to drought, and did not ameliorate the negative effects of elevated temperature on drought. Our findings suggest that elevated temperature and consequent higher vapour pressure deficit, but not elevated [CO2], may be the primary contributors to drought-induced seedling mortality under future climates.
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