Ye Z P, Zhou S X, Yang X L, Kang H J, Duan S H, Wang F B
Maths & Physics College, Jinggangshan University, 343009 Ji'an, China.
The New Zealand Institute for Plant and Food Research Limited, 4130 Hawke's Bay, New Zealand.
Photosynthetica. 2024 Sep 30;62(3):305-313. doi: 10.32615/ps.2024.033. eCollection 2024.
This study aimed to assess variations in leaf gas-exchange characteristics, leaf pigment contents, and some intrinsic traits of photosynthetic pigment molecules in three rice cultivars (cv. JR3015, Wufengyou3015, and Jifengyou3015) using mechanistic models. The findings revealed that chlorophyll content varied significantly among the three cultivars, but not maximum electron transport rate. JR3015 had lower chlorophyll content but the highest eigen-absorption cross-section (σ) and the lowest minimum average life-time of photosynthetic pigment molecules in the excited state (τ). Our results suggested that the highest σ and the lowest τ in JR3015 facilitated its electron transport rate despite its lower leaf chlorophyll content. Furthermore, compared to Jifengyou3015 and Wufengyou3015, JR3015 had the lowest photosynthetic electron-use efficiency PSII, which contributed to its lowest maximum net photosynthetic rate. These findings are important in selecting rice cultivars based on their differences in photosynthetic capacity.
本研究旨在利用机理模型评估三个水稻品种（品种 JR3015、五丰优 3015 和吉丰优 3015）叶片气体交换特征、叶片色素含量以及光合色素分子一些内在特性的差异。研究结果表明，三个品种间叶绿素含量差异显著，但最大电子传递速率无显著差异。JR3015 的叶绿素含量较低，但具有最高的特征吸收截面（σ）和激发态光合色素分子的最低最小平均寿命（τ）。我们的结果表明，尽管 JR3015 的叶片叶绿素含量较低，但其最高的 σ 和最低的 τ 促进了其电子传递速率。此外，与吉丰优 3015 和五丰优 3015 相比，JR3015 的光合电子利用效率 PSII 最低，这导致其最大净光合速率最低。这些发现对于根据水稻品种光合能力的差异进行品种选择具有重要意义。
