Diurnal regulation of photosynthesis in Jatropha curcas under drought during summer in a semi-arid region

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	Diurnal regulation of photosynthesis in Jatropha curcas under drought during summer in a semi-arid region
	Torninaga, J.
刊名	Biomass & Bioenergy
	2014
卷号	67 页码:279-287
ISSN号	0961-9534
中文摘要	The diurnal photosynthetic responses to drought in Jatropha curcas have not been well assessed under field conditions in harsh semi-arid habitats. To illustrate this, diurnal changes in chlorophyll fluorescence and gas exchange rates were measured in field-grown Jatropha with or without a short (13 days) water recovery treatment under drought conditions during hot summer in a semi-arid. Sensitive stomatal closure coordinated with a drying atmosphere strictly limited a net CO2 assimilation rate with a predominant morning peak, eventually turning negative during the day. Even though the risk of excess excitation energy which potentially causes photodamage increased with the extremely low capacity for CO2 fixation, Jatropha preserved the integrity of PSII. Quantitative analysis of quenching partitioning revealed that regulated thermal energy dissipation accounted a large fraction of both instantaneous and daily absorbed energy by up to 80 and 72%, respectively, under the drought condition. Water recovery treatment more than doubled daily CO2 uptake via mitigating diurnal stomatal closure. The regulated thermal dissipation flexibly adjusted PSII quantum efficiency to capacity of CO2 fixation. In addition, downregulation of PSII quantum efficiency via sustained regulated thermal dissipation was observed and thought to be an additional photoprotective function. It is clear that Jatropha strongly rely upon the regulated thermal dissipation under drought condition, which must be critically important for this strict water conserving species, especially under a climate with high solar radiation loads as is seen in semi-arid regions. (C) 2014 Elsevier Ltd. All rights reserved.
公开日期	2015-01-28
内容类型	期刊论文
源URL	[http://ir.xtbg.org.cn/handle/353005/7412]
专题	西双版纳热带植物园_热带植物资源可持续利用重点实验室特色文献_小桐子相关文献
推荐引用方式 GB/T 7714	Torninaga, J.. Diurnal regulation of photosynthesis in Jatropha curcas under drought during summer in a semi-arid region[J]. Biomass & Bioenergy,2014,67:279-287.
APA	Torninaga, J..(2014).Diurnal regulation of photosynthesis in Jatropha curcas under drought during summer in a semi-arid region.Biomass & Bioenergy,67,279-287.
MLA	Torninaga, J.."Diurnal regulation of photosynthesis in Jatropha curcas under drought during summer in a semi-arid region".Biomass & Bioenergy 67(2014):279-287.