Nomura K, Saito M, Ito M, Yamane S, Iwao T, Tada I, Yamazaki T, Ono S, Yasutake D, Kitano M
IoP Collaborative Creation Center, Kochi University, 200 Otsu, Monobe, Nankoku City, 783-8502 Kochi, Japan.
Faculty of Agriculture and Marine Sciences, Kochi University, 200 Otsu, Monobe, Nankoku City, 783-8502 Kochi, Japan.
Photosynthetica. 2022 Aug 31;60(3):457-464. doi: 10.32615/ps.2022.040. eCollection 2022.
Parameters representing leaf photosynthetic capacity, namely, the maximal carboxylation rate ( ), maximal electron transport rate ( ), and triose phosphate-utilization rate ( ), can vary depending on various factors. The present study investigated diurnal variations in , , and of uppermost leaves of soil-grown, well-watered eggplant in a greenhouse based on the simultaneous measurements of leaf gas exchange and chlorophyll fluorescence. The values of net photosynthetic rates and electron transport rates plotted against intercellular CO concentrations were noticeably higher in the morning than in the afternoon. Significant differences were detected among the values of , , and obtained at different times of day (08:30, 11:00, 13:30, and 16:00 h). All three parameters tended to decline as the time of day advanced; compared to the values at 08:30 h, , , and declined by approximately 15% at 16:00 h. Among the three parameters, appeared to be the most sensitive to time.
代表叶片光合能力的参数，即最大羧化速率（ ）、最大电子传递速率（ ）和磷酸丙糖利用速率（ ），会因各种因素而有所不同。本研究基于对叶片气体交换和叶绿素荧光的同步测量，调查了温室中土培、水分充足的茄子最上部叶片的 、 和 的日变化。上午净光合速率和电子传递速率相对于胞间CO 浓度绘制的值明显高于下午。在一天中不同时间（08:30、11:00、13:30和16:00 h）获得的 、 和 的值之间检测到显著差异。随着一天时间的推进，所有这三个参数都趋于下降；与08:30 h的值相比， 、 和 在16:00 h时下降了约15%。在这三个参数中， 似乎对时间最敏感。
