生长在日本北部不同海拔地区的两个种群的 Fagus crenata 幼苗在光合作用热适应性方面的种内差异。

IF 3.5 2区 农林科学 Q1 FORESTRY Tree physiology Pub Date : 2024-08-03 DOI:10.1093/treephys/tpae093
Yasuaki Akaji, Takeshi Torimaru, Shinji Akada
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引用次数: 0

摘要

植物的光合作用可以适应生长温度,但局部适应对光合作用热适应性种内差异的贡献还不完全清楚。在此,我们通过实验研究了生长在日本北部不同海拔高度和温度制度(低海拔和高海拔地点)的两个种群的Fagus crenata幼苗的光合作用热适应性。我们在 22 °C(对照)或 27 °C(温暖处理)的白天温度下对幼苗进行了 14-23 天的驯化,并获得了 19 至 32 °C 范围内的光合温度响应曲线。在 27 °C 下驯化的幼苗的光合作用最适温度(Topt)比在 22 °C 下驯化的幼苗高约 0.6 °C,而且气孔对叶片对空气蒸气压差(VPD)敏感性较高的幼苗的最适温度明显低于敏感性较低的幼苗。在双向方差分析中,温暖处理、种群和处理与种群交互作用对 Topt 的影响不显著,但当气孔对叶片对空气蒸气压差的敏感性作为协变量纳入模型时,处理的影响变得显著。结构方程模型(SEM)表明,根系生物量较低的幼苗由于气孔对叶片对空气VPD的敏感性较高,Topt较低。结构方程建模(SEM)还表明,两个种群改变 Topt 的方式不同:来自高海拔地区的幼苗依靠降低低温下的光合速率来增加 Topt,而来自低海拔地区的幼苗则不然。我们认为,两个种群之间光合作用热适应能力的差异可能反映了对不同气候制度的适应,在研究热适应能力时应考虑地下特征,尤其是幼苗的热适应能力。
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Intraspecific variation in photosynthetic thermal acclimation in Fagus crenata seedlings from two populations growing at different elevations in northern Japan.

Plants can acclimate their photosynthesis to growth temperature, but the contribution of local adaptation to intraspecific variation in thermal acclimation of photosynthesis is not fully understood. Here, we experimentally investigated the photosynthetic thermal acclimation in Fagus crenata Blume seedlings from two populations growing at different elevations and temperature regimes (low- and high-elevation sites) in northern Japan. We acclimated seedlings for 14 to 23 days at daytime temperatures of either 22 °C (control) or 27 °C (warm treatment) and obtained photosynthetic temperature-response curves in the range of 19 to 32 °C. The optimum temperature of photosynthesis (Topt) was ~0.6 °C higher in seedlings acclimated at 27 °C than in those acclimated at 22 °C, and it was significantly lower in seedlings with higher stomatal sensitivity to leaf-to-air vapor pressure deficit than in those with lower sensitivity. The effects of warm treatment, population and treatment-population interaction on Topt were not significant in the two-way analysis of variance, but the effect of treatment became significant when stomatal sensitivity to leaf-to-air vapor pressure deficit was included as a covariate in the model. Structural equation modeling indicated that seedlings with lower root biomass had lower Topt because of the high stomatal sensitivity to leaf-to-air vapor pressure deficit. Structural equation modelling also indicated that the way of shifting the Topt differed between the two populations: seedlings from a high-elevation site depended on decreasing photosynthetic rates at low temperatures for the increase in Topt but seedlings from a low-elevation site did not. We suggest that the difference in thermal acclimation of photosynthesis between the two populations may reflect adaptation to different climate regimes and that belowground traits should be considered when investigating thermal acclimation capacity, especially in seedlings.

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来源期刊
Tree physiology
Tree physiology 农林科学-林学
CiteScore
7.10
自引率
7.50%
发文量
133
审稿时长
1 months
期刊介绍: Tree Physiology promotes research in a framework of hierarchically organized systems, measuring insight by the ability to link adjacent layers: thus, investigated tree physiology phenomenon should seek mechanistic explanation in finer-scale phenomena as well as seek significance in larger scale phenomena (Passioura 1979). A phenomenon not linked downscale is merely descriptive; an observation not linked upscale, might be trivial. Physiologists often refer qualitatively to processes at finer or coarser scale than the scale of their observation, and studies formally directed at three, or even two adjacent scales are rare. To emphasize the importance of relating mechanisms to coarser scale function, Tree Physiology will highlight papers doing so particularly well as feature papers.
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