广西道地药材战骨的光合特性研究

Study on Photosynthetic Characteristics of Premna fulva Craib

关键词:  战骨  光响应曲线  光合日变化  偏相关分析

Key words:  Premna fulva Craib  light response curve  diurnal variation of photosynthesis  partial correlation analysis

摘要:

[目的]针对广西道地药材战骨(Premna fulva Craib)丰产、高产栽培技术研究缺乏的现状,对战骨光合特点进行测定与分析,旨在了解战骨的光合作用特征,为其人工种植提供科学依据。[方法]采用Li-6400便携式光合测定系统对战骨的光合作用-光响应曲线和光合日变化各指标进行测定。[结果]战骨叶片的最大净光合速率17·07 μmol·m^-2·s^-1,表观量子效率0.047 μmol·ml-2·s^-1,暗呼吸速率0.620 μmol·m^-2· s^-1,光饱和点1364 μmol·m^-2·s^-1,光补偿点13.14 μmol·m^-2·s^-1。战骨的净光合速率(P_n)日进程呈"双峰型"曲线,偏相关分析表明,P_n与光合有效辐射、气孔导度、蒸腾速率和叶温呈极显著正相关,光合"午休"的主要原因是强光引起的非气孔因素。[结论]战骨具阳生植物的光合特性,适宜种植在阳光充足的生境。

Abstract:

[Objective] To investigate the photosynthetic characteristics of Premna fulva Craib, and provide a theoretical basis for the high yield cultivation management.[Methods] The net photosynthetic rate to light intensity response curves and diurnal variation of photosynthesis in the leaves of P.fulva were measured by Li-6400 portable photosynthesis measuring system.[Results] The maximal net photosynthesis rate of P.fulva was 17.07 μmol·m^-2 ·s^-1. The apparent quantum yield was 0.0471 μmol · m^-2 · s^-1. The dark respiration rate was 0.620 μmol· m^-2 · s^-1. The light saturation point was 1364 μmol · m^-2 · s^-1. The light compensation point of photosynthesis was 13.14 μmol·m^-2 ·s^-1. Diurnal variation in net photosynthetic rate (P_n) of P.fulva was two-peak pattern, and the main cause for the decline of photosynthetic rate was the non stomatal limitation. Partial correlation analysis showed that,the P_n of P.fulva were significantly related to photosynthetically active radiation, stomatal conductance,transpiration rate and leaf temperature.[Conclusion] P.fulva was a shrub shared similar photosynthetic characteristics with sun plants, which is suitable to plant in sunny habitats.