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Pubmed ID :29507736
Publication Date : //

Cytological, physiological, and transcriptomic analyses of golden leaf coloration in L.


is grown worldwide as an ornamental plant for its golden leaf color. However, the regulatory mechanism of leaf coloration in remains unclear. Here, we compared gold-colored mutant leaves and normal green leaves in cytological, physiological and transcriptomic terms. We found that chloroplasts of the mutant were fewer and smaller, and exhibited ruptured thylakoid membranes, indistinct stromal lamellae and irregularly arranged vesicles. Physiological experiments also showed that the mutant had a lower chlorophyll, lower flavonoid and higher carotenoid contents (especially lutein). We further used transcriptomic sequencing to identify 116 differentially expressed genes (DEGs) and 46 transcription factors (TFs) involved in chloroplast development, chlorophyll metabolism, pigment biosynthesis and photosynthesis. Among these, the chlorophyll biosynthesis-related showed down-regulation, while chlorophyll degradation-related had up-regulated expression in mutant leaves. , , and , which are involved in carotenoid biosynthesis were up-regulated. Quantitative real-time PCR (RT-qPCR) further confirmed the altered expression levels of these genes at three stages. The alteration of and / gene expression might affect chlorophyll biosynthesis and promote degradation of chlorophyll to chlorophyll , while the up-regulated genes , and enhanced carotenoid accumulation. Consequently, changes in the ratio of carotenoids to chlorophylls were the main factors driving the golden leaf coloration in the mutant .

Authors : Li Wei-xing , Yang Shun-bo , Lu Zhaogeng , He Zhi-chong , Ye Yun-ling , Zhao Bei-bei , Wang Li , Jin Biao ,

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