摘要
以日本栗品种和板栗品种为试材,研究了2者的光合生理特性及日变化过程。日本栗表观量子效率、光补偿点、光饱和点及光饱和光合速率比板栗高。2者光合速率和蒸腾速率日变化曲线均呈“双峰”型,光合速率与胞间CO2浓度变化密切相关,而蒸腾速率与气孔导度的变化趋向基本同步。中午胞间CO2浓度的增高以及Rubisco羧化效率的降低表明,光合速率午间降低主要受非气孔限制因素的影响,而且日本栗受到的影响比板栗大,光合“午休”程度更严重。
The characteristics of photosynthesis in leaves of Japanese chestnut and Chinese chestnut cultivars were studied. The main results were as follows: the apparent quantum yield (AQY), and the light compensation and saturation point for Pn were higher in Japanese chestnuts than those in Chinese chestnuts; the diurnal variation of net photosynthetic rates (Pn) and transpiration rates (Tr) were 'twin-peaked' curves. The changes of Pn showed a close relationship with that of intercelluar CO2 concentration (Ci), whereas the variations of Tr and Gs tend to be synchronous. The increase of Ci and the decrease of carboxylation efficiency (CE) at midday indicated that the rapid reduction of Pn was chiefly due to non-stomatal restriction factors. Such reduction effect was more obvious in Japanese chestnuts than in Chinese chestnuts.
出处
《果树学报》
CAS
CSCD
北大核心
2005年第4期335-338,共4页
Journal of Fruit Science
基金
国家基础性工作项目
科技部作物资源保护项目"核桃板栗种质资源共享试点建设"(编号:NB04-9)。
关键词
栗
板栗
光合特性
日变化
Japanese chestnut(Castanea crenata)
Chinese chestnut(C. mollissima)
Photosynthetic characteristics
Diurnal variation
