数字农科院2.0

Repressed Gene Expression Of Photosynthetic Antenna Proteins Associated With Yellow Leaf Variation As Revealed By Bulked Segregant Rna-Seq In Tea Plant Camellia Sinensis

文献类型： 外文期刊

作者： Wang, JY; Chen, JD; Wang, SL; Chen, L; Ma, CL; Yao, MZ

作者机构：

关键词： Bulked Segregant Rna-Sea; Camellia Sinensis; Chloroplast; Leaf Color

期刊名称： JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY

ISSN： 0021-8561

年卷期： 2020 年 68 卷 30 期

页码：

收录情况： JCR（2021版） ; EI（2021版）

摘要： The young leaves and shoots of albino tea cultivars are usually characterized as having a yellow or pale color, high amino acid, and low catechin. Increasing attention has been paid to albino tea cultivars in recent years because their tea generally shows high umami and reduced astringency. However, the genetic mechanism of yellow-leaf variation in albino tea cultivar has not been elucidated clearly. In this study, bulked segregant RNA-seq (BSR-seq) was performed on bulked yellow- and green-leaf hybrid progenies from a leaf color variation population. A total of 359 and 1134 differentially expressed genes (DEGs) were identified in the yellow and green hybrid bulked groups (Y-f vs G(f)) and parent plants (Y-p vs G(p)), respectively. The significantly smaller number of DEGs in Y-f versus G(f) than in Y-p versus G(p) indicated that individual differences could be reduced within the same hybrid progeny. Analysis of Gene Ontology and Kyoto Encyclopedia of Genes and Genomes revealed that the photosynthetic antenna protein was most significantly enriched in either the bulked groups or their parents. Interaction was found among light-harvesting chlorophyll a/b -binding proteins (LHC), heat shock proteins (HSPs), and enzymes involved in cuticle formation. Combined with the transcriptomic expression profile, results showed that the repressed genes encoding LHC were closely linked to aberrant chloroplast development in yellow-leaf tea plants. Furthermore, the photoprotection and light stress response possessed by genes involved in HSP protein interaction and cuticle formation were discussed. The expression profile of DEGs was verified via quantitative real-time PCR analysis of the bulked samples and other F-1 individuals. In summary, using BSR-seq on a hybrid population eliminated certain disturbing effects of genetic background and individual discrepancy, thereby helping this study to intensively focus on the key genes controlling leaf color variation in yellow-leaf tea plants.

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