Pigment comparison and expression of chlorophyll metabolism genes in yellow and green Acer palmatum Thunb. ex Murray leaves

文献类型： 外文期刊

第一作者： Li, S-S.

作者： Li, S-S.;Li, Q-Z.;Tang, L.;Wen, J.

作者机构：

关键词： leaf color variation;pigment;gene expression;Acer palmatum

期刊名称：CANADIAN JOURNAL OF PLANT SCIENCE （ 影响因子：1.018； 五年影响因子：1.242 ）

ISSN： 0008-4220

年卷期： 2017 年 97 卷 5 期

页码：

收录情况： SCI

摘要： Exterior leaf color is an important trait for ornamental foliage plants but the molecular mechanism underlying the variation in color between yellow-and green-leaf Acer palmatum Thunb. ex Murray is poorly understood. Indeed, chlorophyll (Chl) contents and gene transcriptions were very different between the yellow mutant (YM) and green wild-type (GW) leaves of this species. Here, annual variations of leaf color and pigment contents in two varieties were investigated. Then, transcript levels of six genes involved in Chl metabolism were quantitatively measured using real-time polymerase chain reaction in YM and GW leaves. Compared with GW, the color changes of YM leaves were classified into four typical periods. During the yellow leaf stage, YM showed greatly reduced Chl synthesis and a higher ratio of carotenoid (Car) to Chl than GW. These phenomena may be the main cause of yellow leaves in YM. In addition, expression levels of Chl synthesis genes (ApPORA, ApPORB, ApCAO, and ApCHLG) in YM were very low during this period. Concomitantly, the amount of transcripts of genes for Chl degradation (ApCLH1 and ApCLH2) rose significantly compared with GW. Once YM leaves turned red, the above differences between the two genotypes lessened. Overall, our results indicated that changes in Chl synthesis and degradation may play important roles leading to the yellow leaves of YM A. palmatum.

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