Variation in Photosynthetic Efficiency under Fluctuating Light between Rose Cultivars and its Potential for Improving Dynamic Photosynthesis

文献类型： 外文期刊

第一作者： Wang, Xiao-Qian

作者： Wang, Xiao-Qian;Wang, Xiao-Qian;Zeng, Zhi-Lan;Huang, Wei;Zeng, Zhi-Lan;Shi, Zi-Ming;Wang, Ji-Hua

作者机构：

关键词： chlorophyll fluorescence; CO2 assimilation; mesophyll conductance; photosynthetic limitation; stomatal conductance

期刊名称：PLANTS-BASEL （ 影响因子：4.5； 五年影响因子：4.8 ）

ISSN：

年卷期： 2023 年 12 卷 5 期

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收录情况： SCI

摘要： Photosynthetic efficiency under both steady-state and fluctuating light can significantly affect plant growth under naturally fluctuating light conditions. However, the difference in photosynthetic performance between different rose genotypes is little known. This study compared the photosynthetic performance under steady-state and fluctuating light in two modern rose cultivars (Rose hybrida), "Orange Reeva" and "Gelato", and an old Chinese rose plant Rosa chinensis cultivar, "Slater's crimson China". The light and CO2 response curves indicated that they showed similar photosynthetic capacity under steady state. The light-saturated steady-state photosynthesis in these three rose genotypes was mainly limited by biochemistry (60%) rather than diffusional conductance. Under fluctuating light conditions (alternated between 100 and 1500 mu mol photons m(-2) m(-1) every 5 min), stomatal conductance gradually decreased in these three rose genotypes, while mesophyll conductance (g(m)) was maintained stable in Orange Reeva and Gelato but decreased by 23% in R. chinensis, resulting in a stronger loss of CO2 assimilation under high-light phases in R. chinensis (25%) than in Orange Reeva and Gelato (13%). As a result, the variation in photosynthetic efficiency under fluctuating light among rose cultivars was tightly related to g(m). These results highlight the importance of g(m) in dynamic photosynthesis and provide new traits for improving photosynthetic efficiency in rose cultivars.

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