Photosynthetic carbon and nitrogen metabolism of Camellia oleifera Abel during acclimation to low light conditions

文献类型： 外文期刊

第一作者： Wu, Yang

作者： Wu, Yang;Zhang, Lisha;Zhang, Yan;Zhou, Huiwen;Liu, Yanan;Ma, Lin;Wang, Yongjun

作者机构：

关键词： Leaf nitrogen; Photosynthesis; Photosynthetic nitrogen use efficiency; Storage nitrogen; Metabolome; Transcriptome

期刊名称：JOURNAL OF PLANT PHYSIOLOGY （ 影响因子：3.686； 五年影响因子：4.352 ）

ISSN： 0176-1617

年卷期： 2022 年 278 卷

页码：

收录情况： SCI

摘要： Tea-oil tree (Camellia oleifera Abel) is an important woody oil crop with high economic value. However, it has low photosynthetic production considering the low light intensity of its growth environment. To understand the acclimation mechanism of tea-oil trees to low light conditions, three light intensity treatments were conducted: high light (450-500 mu mol. m(-2). s(-1)), medium light (180-200 mu mol. m(-2). s(-1)), and low light (45-50 mu mol. m(-2). s(-1)). The carbon (C) and nitrogen (N) metabolism network were constructed by investigating the leaf anatomy, photosynthetic characteristics, N partitioning, transcriptome and metabolome. Results demonstrated that a larger proportion light energy was used for photochemical reactions in an environment with lower light intensity, which resulted in an increase in photosystem II photochemical efficiency and instantaneous light use efficiency (LUE) at the leaf level. As the light intensity increased, decreased electron transfer and carboxylation efficiencies, photorespiration and dark respiration rates, LUE at plant level, and N use efficiency (PNUE) were observed. Leaves trended to harvest more light using higher expression levels of light-harvesting protein genes, higher chlorophyll content, more granum and more tightly stacked granum lamella under lower light intensity. At transcriptional and metabolic levels, the TCA cycle, and the synthesis of starch and saccharides were weakened as light intensity decreased, while the Calvin cycle did not show the regularity between different treatments. Less N was distributed in Rubisco, respiration, and cell wall proteins as light decreased. Storage N was prominently accumulated in forms of amino acids (especially L-arginine) and amino acid derivatives as under medium and low light environments, to make up for C deficiency. Therefore, tea-oil trees actively improve lightharvesting capacity and enlarges the storage N pool to adapt to a low light environment, at the cost of a decrease of photosynthetic C assimilation and PNUE.

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