Photosynthetic regulation under fluctuating light in young and mature leaves of the CAM plant Bryophyllum pinnatum

doi:10.1016/j.bbabio.2019.04.006

	Photosynthetic regulation under fluctuating light in young and mature leaves of the CAM plant Bryophyllum pinnatum
	Yang, Ying-Jie 1,2; Zhang, Shi-Bao1 ; Huang, Wei1
通讯作者	Zhang, Shi-Bao(sbzhang@mail.kib.ac.cn) ; Huang, Wei(huangwei@mail.kib.ac.cn)
	2019-06-01
发表期刊	BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
ISSN	0005-2728
卷号	1860 期号:6 页码:469-477
摘要	Photosystem I (PSI) is the potential target of photodamage under fluctuating light in angiosperms. However, the response of PSI to fluctuating light in young leaves has not yet been clarified. Furthermore, the photosynthetic regulation under fluctuating light in crassulacean acid metabolism (CAM) plants is little known. In this study, we measured PSI redox state and the electrochromic shift signal in the mature and young leaves of a CAM species Botophyllum pinnatum. The mature leaves showed stronger capacity for photo-reduction of O-2 mediated by the alternative electron flow (probably the water-water cycle) when compared with the young leaves. After an increase in light intensity, both the mature and young leaves showed insufficient proton gradient (Delta pH) across the thylakoid membranes within the first seconds. Meanwhile, PSI was highly oxidized in the mature leaves but was in a more reduced state in the young leaves. Furthermore, young leaves were more susceptible to PSI photoinhibition under fluctuating light. Therefore, in the mature leaves, the alternative electron flow significantly optimized the PSI redox state under fluctuating light at relatively low Delta pH. By comparison, in the young leaves, Delta pH redox state was largely determined by the buildup of Delta pH. Therefore, the major photo protective mechanism responsible for safeguarding PSI under fluctuating light can be influenced by leaf developmental stages.
关键词	Photoprotection Photosystem I Proton gradient Redox state of P700 Water-water cycle Leaf development
DOI	10.1016/j.bbabio.2019.04.006
收录类别	SCI
语种	英语
WOS记录号	WOS:000471082200004
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/67343
专题	资源植物与生物技术所级重点实验室
通讯作者	Zhang, Shi-Bao; Huang, Wei
作者单位	1.Chinese Acad Sci, Kunming Inst Bot, Kunming 650201, Yunnan, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Yang, Ying-Jie,Zhang, Shi-Bao,Huang, Wei. Photosynthetic regulation under fluctuating light in young and mature leaves of the CAM plant Bryophyllum pinnatum[J]. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS,2019,1860(6):469-477.
APA	Yang, Ying-Jie,Zhang, Shi-Bao,&Huang, Wei.(2019).Photosynthetic regulation under fluctuating light in young and mature leaves of the CAM plant Bryophyllum pinnatum.BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS,1860(6),469-477.
MLA	Yang, Ying-Jie,et al."Photosynthetic regulation under fluctuating light in young and mature leaves of the CAM plant Bryophyllum pinnatum".BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1860.6(2019):469-477.

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