Integrated multi-omics and physiological profiling uncover the molecular basis of leaf color transition in an albino mutant of Camellia sinensis cv. Huangshanbaicha 1 during its albinotic stage

文献类型： 外文期刊

第一作者： Xie, Yinghua

作者： Xie, Yinghua;Shi, Qing;Cheng, Letian;Wang, Zi;Shen, Zhougao;Yang, Tianyuan;Liu, Yaqin

作者机构：

关键词： Camellia sinensis; Leaf color transition; Developmental stage; Endogenous plant hormone; Albinism

期刊名称：INDUSTRIAL CROPS AND PRODUCTS （ 影响因子：6.2； 五年影响因子：6.2 ）

ISSN： 0926-6690

年卷期： 2025 年 232 卷

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收录情况： SCI

摘要： Albino tea cultivars have gained considerable attention in the tea industry because of their distinctive flavor profiles, characterized by enhanced freshness and reduced astringency compared with those of conventional green tea cultivars. Nevertheless, the molecular mechanisms underlying dynamic color transitions in tea leaves during different developmental stages remain poorly understood. In this study, we employed a multi-omics approach to investigate leaf color variation by analyzing the same leaf positions from the albino cultivar 'Huangshanbaicha 1' (HSBC1) and the green-leaved cultivar 'Huangshanzhong' (HSZ) across four developmental stages. Through integrated histological, transcriptomic, proteomic, and metabolomic analyses, we observed that chloroplasts in the albino HSBC1 leaves exhibited developmental anomalies, manifesting as the absence of typical thylakoid vesicles and disorganized lamellar structures. The chlorophyll deficiency observed in albino leaves correlated with impaired chloroplast biogenesis and the downregulation of critical structural genes involved in both photosynthetic pathways and chlorophyll biosynthesis. Furthermore, our findings suggest a coordinated regulation of leaf color plasticity in HSBC1 through plant endogenous hormones and transcription factor networks, including MYB, bZIP, and bHLH families. Proteomic profiling revealed a diminished abundance of photosystem components in HSBC1 compared with that in HSZ, consistent with ultrastructural defects in chloroplast organization. Additionally, although partial recovery of enzymatic activities associated with photosystem II and light-harvesting complexes occurred during leaf re-greening, these levels remained suboptimal relative to those in HSZ, indicating persistent functional impairments. Our results delineate an intricate regulatory network involving core photosynthetic genes, transcriptional regulators, and phytohormonal signals that collectively govern chlorophyll metabolism and chloroplast development in the HSBC1 and HSZ cultivars of the tea plant (Camellia sinensis). Together, these findings advance our understanding of the mechanisms underlying albinism in tea plants and provide valuable genetic resources for optimizing tea germplasm through molecular breeding strategies.

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