文献类型：期刊文献

英文题名：Coordinated Regulation of Photosynthesis, Stomatal Traits, and Hormonal Dynamics in Camellia oleifera During Drought and Rehydration

作者：Cao, Linqing[1,2] Yan, Chao[1,2] He, Tieding[1,2] Zhong, Qiuping[1,2] Yuan, Yaqi[1,2] Cao, Lixian[1,2]

第一作者：Cao, Linqing;曹林青

通信作者：Yan, C[1];Yan, C[2]

机构：[1]Chinese Acad Forestry, Expt Ctr Subtrop Forestry, Xinyu 338000, Peoples R China;[2]Key Lab Cultivat & Utilizat Oil Camellia Resources, Xinyu 338000, Peoples R China

年份：2025

卷号：14

期号：8

外文期刊名：BIOLOGY-BASEL

收录：;Scopus(收录号：2-s2.0-105014516688);WOS:【SCI-EXPANDED(收录号:WOS:001559790100001)】；

基金：This work was supported by the Fundamental Research Funds of CAF (CAFYBB2023ZA001-2), the Key R&D Program "Unveiling and Leading" Projects of Jiangxi Province (20223BBF61012), the Natural Science Foundation of Jiangxi Province (20242BAB20302), and the Oil-Camellia Special Research Project of the Jiangxi Provincial Department of Forestry (JXYCZX [2023]010201).

语种：英文

外文关键词：Camellia oleifera; drought-rehydration cycle; photosynthetic traits; stomatal traits; endogenous hormones; synergistic regulatory network

摘要：Camellia oleifera, a woody oilseed species endemic to China, often experiences growth constraints due to seasonal drought. This study investigates the coordinated regulation of photosynthetic traits, stomatal behavior, and hormone responses during drought-rehydration cycles in two cultivars with contrasting drought resistance: 'CL53' (tolerant) and 'CL40' (sensitive). Photosynthetic inhibition resulted from both stomatal and non-stomatal limitations, with cultivar-specific differences. After 28 days of drought, the net photosynthetic rate (P-n) declined by 26.6% in CL53 and 32.6% in CL40. A stable intercellular CO2 concentration (C-i) in CL53 indicated superior mesophyll integrity and antioxidant capacity. CL53 showed rapid P-n recovery and photosynthetic compensation post-rehydration, in contrast to CL40. Drought triggered extensive stomatal closure; >98% reopened upon rehydration, though the total stomatal pore area remained reduced. Abscisic acid (ABA) accumulation was greater in CL40, contributing to stomatal closure and P-n suppression. CL53 exhibited faster ABA degradation and gibberellin (GA(3)) recovery, promoting photosynthetic restoration. ABA negatively correlated with P-n, transpiration rate (T-r), stomatal conductance (G(s)), and C-i, but positively with stomatal limitation (L-s). Water use efficiency (WUE) displayed a parabolic response to ABA, differing by cultivar. This integrative analysis highlights a coordinated photosynthesis-stomata-hormone network underlying drought adaptation and informs selection strategies for drought-resilient cultivars and precision irrigation.