Differential responses of photosystems I and II to seasonal drought in two Ficus species

CORC > 西双版纳热带植物园 > 中国科学院西双版纳热带植物园 > 植物生理生态研究组

	Differential responses of photosystems I and II to seasonal drought in two Ficus species
	Zhang, Jiaolin
刊名	ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY
	2016
卷号	73 期号:x 页码:53-60
关键词	Non-photochemical quenching Cyclic electron flow Osmotic potential at turgor loss point Predawn leaf water potential Seasonal drought
中文摘要	Hemiepiphytic Ficus species exhibit more conservative water use strategy and are more drought-tolerant compared with their non-hemiepiphytic congeners, but a difference in the response of photosystem I (PSI) and photosystem II (PSII) to drought stress has not been documented to date. The enhancement of non-photochemical quenching (NPQ) and cyclic electron flow (CEF) have been identified as important mechanisms that protect the photosystems under drought conditions. Using the hemiepiphytic Ficus tinctoria and the non-hemiepiphytic Ficus racemosa, we studied the water status and the electron fluxes through PSI and PSII under seasonal water stress. Our results clearly indicated that the decline in the leaf predawn water potential (psi(pd)), the maximum photosynthetic rate (A(max)) and the predawn maximum quantum yield of PSII (F-v/F-m) were more pronounced in F. racemosa than in F. tinctoria at peak drought. The F-v/F-m of F. racemosa was reduced to 0.69, indicating net photoinhibition of PSII. Concomitantly, the maximal photo-oxidizable P700 (P-m) decreased significantly in F. racemosa but remained stable in F. tinctoria. The fraction of non-photochemical quenching [Y(NPQ)] and the ratio of effective quantum yield of PSI to PSII [Y(I)/Y(II)] increased for both Ficus species at peak drought, with a stronger increase in F. racemosa. These results indicated that the enhancement of NPQ and the activation of CEF contributed to the photoprotection of PSI and PSII for both Ficus species under seasonal drought, particularly for F. racemosa.
公开日期	2016-07-06
内容类型	期刊论文
源URL	[http://ir.xtbg.org.cn/handle/353005/9902]
专题	西双版纳热带植物园_植物生理生态研究组
推荐引用方式 GB/T 7714	Zhang, Jiaolin. Differential responses of photosystems I and II to seasonal drought in two Ficus species[J]. ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY,2016,73(x):53-60.
APA	Zhang, Jiaolin.(2016).Differential responses of photosystems I and II to seasonal drought in two Ficus species.ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY,73(x),53-60.
MLA	Zhang, Jiaolin."Differential responses of photosystems I and II to seasonal drought in two Ficus species".ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY 73.x(2016):53-60.