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Light Regulation to chlorophyll synthesis and Plastid Development of the chlorophyll-Less Golden-Leaf Privet

Journal of Integrative Plant Biology 2010年第9期52卷 809-816页

作者： Ming Yuan Mo-Yun Xui Shu Yuan Yang-Er Chen Jun-Bo Du Fei Xu Zhong-Wei Zhang Zi-Chan Guo Zhong-Yi Zhao Hong-Hui Lin Key Laboratory for Bio-Resource and Eco-Environment M~nistry of Education School of Life Sciences Sichuan University Chengdu 610064 China College of Biology and Science Sichuan Agricultural University Ya'an 625014 China Plant Physiology Laboratory School of Life Sciences Sichuan University Chengdu 610064 China

Ligustrum vicaryi L. is a hybrid of Ligustrum ovalifolium Hassk. var. aureo-marginatum and Ligustrum vulgale L., and displays a chlorophyll-less phenotype. Therefore it is widely used as a horticultural shrub because of its golden-color leaves. Its putative mechanism, light responses, chlorophyll synthesis and plastid development were studied. L. vicaryi has a higher level of *** acid （ALA）, but lower levels of chlorophylls compared with L. quihoui. The yellowish phenotype of L. vicaryi upper leaves could be attributed to their hampered conversion from chlorophyllide into chlorophyll a. Despite the enhanced ALA level and the decreased thylakoid stacking in plastids, L. vicaryi golden leaves contain normal levels of Lhcb transcripts and photosystem apoproteins. Furthermore, reactive oxygen species （ROS） accumulation is almost the same in L. vicaryi and L. quihoui. The golden leaves often turn green and the contents of chlorophylls increase with decreasing light intensity. Dynamic changes of chlorophyll- synthesis-system under the light transition were also analyzed.

关键词： chlorophyll synthesis PLASTIDS PRIVETS SHRUBS ACTIVE oxygen SPECIES

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PGL3 is required for chlorophyll synthesis and impacts leaf senescence in rice

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2018年第4期19卷 263-273页

作者： Jing YE Yao-long YANG Xing-hua WEI Xiao-jun NIU Shan WANG Qun XU Xiao-ping YUAN Han-yong YU Yi-ping WANG Yue FENG Shu WANG College of Agronomy Shenyang Agricultural University State Key Laboratory of Rice Biology China National Rice Research Institute

Rice leaf color mutants play a great role in research about the formation and development of chloroplasts and the genetic mechanism of the chlorophyll （Chl） metabolism pathway, pgl3 is a rice leaf color mutant derived from Xiushuil 1 （Oryza sativa L. spp. japonica）, treated with ethyl methane sulfonate （EMS）. The mutant exhibited a pale- green leaf （pg/） phenotype throughout the whole development as well as reduced grain quality. Map-based cloning of PGL3 revealed that it encodes the chloroplast signal recognition particle 43 kDa protein （cpSRP43）. PGL3 affected the Chl synthesis by regulating the expression levels of the Chl synthesis-associated genes. Considerable reactive oxygen species were accumulated in the leaves of pgl3, and the transcription levels of its scavenging genes were down- regulated, indicating that pgl3 can accelerate senescence. In addition, high temperatures could inhibit the plant＇s growth and facilitate the process of senescence in pgl3.

关键词： Pale-green leaf chlorophyll synthesis Reactive oxygen species Senescence Rice

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The rice Yellow-Green Leaf 18 locus is essential for chlorophyll synthesis, plant growth and retrograde plastid-nuclear signaling

The rice Yellow-Green Leaf 18 locus is essential for chlorop...

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2016年全国植物生物学大会

作者： Zhaohai Wang Xiao Hong Keke Hu Shiyun Du Yang Li Dandan Hu Kexin Cheng Yangsheng Li State Key Laboratory of Hybrid Rice College of Life SciencesWuhan University Rice research institute Anhui Academy of Agricultural Sciences State Key Laboratory of Hybrid Rice Key Laboratory for Research and Utilization of Heterosis in Indica RiceMinistry of AgricultureCollege of Life SciencesWuhan University

chlorophyll synthesis from glutamyl-t RNA to chlorophyll b needs 15 steps of enzymatic reaction,and all 27 genes encoding these 15 enzymes have been identified in higher plants represented by Arabidopsis(Arabidopsis thaliana). However,only nine genes encoding six enzymes in chlorophyll synthesis pathway have been identified in rice(Oryza sativa). In this study,a spontaneous mutant,yellow-green leaf 18(ygl18),was isolated in rice(Oryza sativa). This mutant showed yellow-green leaf,decreased chlorophyll level,and clime-dependent growth difference. Map-based cloning of this mutant identified the YGL18 gene,and this gene has not yet been studied in rice. YGL18 is expressed in green tissues,especially in leaf,and it functions in chloroplast. Bioinformatic analysis showed that YGL18 encodes one of the key enzymes of the chlorophyll synthesis pathway. Multiple sequence alignment revealed that the amino-acid substitution of leucine(Leu) to phenylalanine(Phe) in ygl18 is originally conserved in different photosynthesis organisms. In-vitro enzymatic assays identified the YGL18 enzymatic activity,but ygl18 almost lost the enzymatic function. YGL18 plays important roles in light-dependent and photoperiod-regulated chlorophyll synthesis. Plastid-related nuclear genes were regulated in ygl18 leaves,and the majority of genes in the tetrapyrrole synthesis pathway were up-regulated,implying that there is a new model on retrograde plastid-nuclear signaling. Based on these findings,it is suggested that YGL18 plays essential roles in chlorophyll synthesis,plant growth and regulating plastid-nuclear signaling.

关键词： chlorophyll synthesis yellow-green leaf 18 plant growth plastid-nuclear signaling

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A pair of transposase-derived transcription factors plays multifaceted roles in regulating Arabidopsis development

A pair of transposase-derived transcription factors plays mu...

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第十四届全国植物基因组学大会

作者： Rongcheng Lin Gang Li Xinhao Ouyang Xi Huang Xing Wang Deng Haiyang Wang Department of Molecular Cellular and Developmental BiologyYale University

Arabidopsis FAR-RED ELONGATED HYPOCOTYL3(FHY3) and FAR-RED-IMPAIRED RESPONSE1(FAR1) are a pair of transposase-derived transcription *** were initially identified as positive regulators of phytochrome A(phyA) signaling by modulating phyA nuclear accumulation and phyA responses through directly activating gene expression of a pair of downstream

关键词： Arabidopsis FHY3 FAR1 phyA signaling circadian clock chloroplast division chlorophyll synthesis UV-B response

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