Chen Chung-I, Lin Kuan-Hung, Huang Meng-Yuan, Yang Chih-Kai, Lin Yu-Hsiu, Hsueh Mei-Li, Lee Li-Hua, Lin Shiou-Ruei, Wang Ching-Wen
Department of Forestry, National Pingtung University of Science and Technology, Pingtung County, 91201, Taiwan.
Department of Horticulture and Biotechnology, Chinese Culture University, Taipei City, 11114, Taiwan.
Bot Stud. 2024 Mar 22;65(1):10. doi: 10.1186/s40529-024-00416-0.
Sod culture (SC) and conventional agriculture (CA) represent two distinct field management approaches utilized in the cultivation of tea plants in Taiwan. In this study, we employed gas exchange and chlorophyll fluorescence techniques to assess the impact of SC and CA methods on the photosynthetic machinery of Camellia sinensis cv. TTES No.12 (Jhinhsuan) in response to variable light intensities across different seasons. In spring, at photosynthetic photon flux densities (PPFD) ranging from 800 to 2,000 μmol photon m s, the net photosynthesis rate (Pn, 10.43 μmol CO m s), stomatal conductance (Gs, 126.11 mmol HO m s), electron transport rate (ETR, 137.94), and ΔF/Fm' and Fv/Fm (50.37) values for plants grown using SC were comparatively higher than those cultivated under CA. Conversely, the non-photochemical quenching (NPQ) values for SC-grown plants were relatively lower (3.11) compared to those grown under CA at 800 to 2,000 PPFD in spring. Additionally, when tea plants were exposed to PPFD levels below 1,500 μmol photon m s, there was a concurrent increase in Pn, Gs, ETR, and NPQ. These photosynthetic parameters are crucial for devising models that optimize cultivation practices across varying seasons and specific tillage requirements, and for predicting photosynthetic and respiratory responses of tea plants to seasonally or artificially altered light irradiances. The observed positive impacts of SC on maximum photosynthetic rate (Amax), Fv/Fm, Gs, water-use efficiency (WUE), and ETR suggest that SC is advantageous for enhancing the productivity of tea plants, thereby offering a more adaptable management model for tea gardens.
草生栽培（SC）和传统农业（CA）是台湾茶树种植中采用的两种不同田间管理方法。在本研究中，我们运用气体交换和叶绿素荧光技术，评估草生栽培和传统农业方法对茶树品种台茶12号（金萱）光合机制的影响，该影响是针对不同季节变化的光照强度而言。春季，在光合光子通量密度（PPFD）为800至2000 μmol光子·m⁻²·s⁻¹时，采用草生栽培种植的茶树的净光合速率（Pn，10.43 μmol CO₂·m⁻²·s⁻¹）、气孔导度（Gs，126.11 mmol H₂O·m⁻²·s⁻¹）、电子传递速率（ETR，137.94）以及ΔF/Fm'和Fv/Fm（50.37）值，相较于传统农业栽培的茶树相对更高。相反，春季在800至2000 PPFD条件下，草生栽培种植的茶树的非光化学猝灭（NPQ）值（3.11）相较于传统农业栽培的茶树相对更低。此外，当茶树暴露于低于1500 μmol光子·m⁻²·s⁻¹的PPFD水平时，Pn、Gs、ETR和NPQ会同时增加。这些光合参数对于设计优化不同季节栽培实践和特定耕作要求的模型，以及预测茶树对季节性或人工改变的光照辐照的光合和呼吸响应至关重要。观察到的草生栽培对最大光合速率（Amax）、Fv/Fm、Gs、水分利用效率（WUE）和ETR的积极影响表明，草生栽培有利于提高茶树的生产力，从而为茶园提供一种更具适应性的管理模式。
