茶树新品种桂绿1号光合特性初步研究

采用Li-6400便携式光合测定系统对茶树新品种桂绿1号的光合-光响应曲线和光合日变化进行了测定分析。结果表明,在夏季晴天条件下,桂绿1号净光合速率(Pn)日变化呈单峰曲线,峰值出现在11:00,约为9.36μmol·m-2·s-1;蒸腾速率(Tr)的日变化也为单峰曲线,但其最大值出现在15:00,约为4.06mmol·m-2·s-1。该品种的光饱和点与光补偿点分别为354.60μmol·m-2·s-1和7.13μmol·m-2·s-1,表观量子效率(Φ)为0.088 mol·mol-1。逐步多元回归分析表明,光合有效辐射和空气相对湿度是直接影响桂绿1号茶树净光合速率日变化的主要因子。该研究为桂绿1号的引种、速生丰产和制定栽培管理措施提供理论依据。

A Preliminary Study on Photosynthetic Characteristics for New Tea Cultivar Guilyu-I

The Pn-PAR response curve and diurnal variation of photosynthesis ofa new teacultivarGuilyu-Iwere measuredand analyzedwith the Li-6400 portable photosythesis measuring system.The results showed thatthe curve of diurnal variation of net photosynthetic rate (Pn) couldbe described as unimodal curve,and the peak value was 9.36μmol·m-2·s-1,which occurred at11:00AM. The curve ofdiurnal variation of transpiration rate was alsoshowed in asingle peak curve,but the peak value appeared at 15:00,which was4.06mmol·m-2·s-1.The stepwise multi-regression analysis showed that thephotosynthetically active radiation and air relative humidity were the main direct factors which affected the diurnal variation of Pn.The light compensation point and light saturation point in cultivarGuilyu-Iwere7.13and354.60μmol·m-2·s-1respectively.And the apparent quantum yieldwas0.088 mol·mol-1.Thisstudyprovidedatheoretical basis for fast-growingandhigh-yieldcultivation, andforthe establishment ofcultivationmanagementstrategyof the introduction ofGuilyu-Icultivar.