Speed versus endurance tradeoff in plants: Leaves with higher photosynthetic rates show stronger seasonal declines.
Speed versus endurance tradeoff in plants: Leaves with higher photosynthetic rates show stronger seasonal declines.
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植物速度与耐力的权衡：光合速率较高的叶子表现出更强的季节性衰退
DOI：
10.1038/srep42085
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发表时间：
2017-02-10
影响因子：
4.6
通讯作者：
Li N
中科院分区：
文献类型：
--
作者：
Zhang YJ;Sack L;Cao KF;Wei XM;Li N
我们测试了植物最大光合速率和在不利季节的不利条件下维持光合作用的能力之间的权衡。这种权衡与观察到的运动员和一些动物的最大速度和耐力之间的权衡是一致的，这已经被成本效益理论解释了。这一趋势将具有重要意义的叶设计的一般理解，并将简化模型的年度叶碳关系。我们测试了这样的权衡使用跨维管植物的数据库分析，并使用实验方法为29苏铁种，代表一个古老的植物谱系多样化的万年青叶。在这两个测试中，较高的光合速率单位质量或单位面积在有利的季节与较强的绝对或百分比下降在不利的季节。我们解决了一个可能的机制的基础上的生物力学和氮分配;苏铁叶片韧性高（单位面积的叶质量）和更高的投资在叶片结构比生理功能（C/N比）往往有较低的暖季光合作用，但在凉爽的季节抑郁症少。我们建议，这种权衡，符合成本效益理论，代表了一个显着的生理物候限制光合速率的多样性和季节动态。
We tested for a tradeoff across species between plant maximum photosynthetic rate and the ability to maintain photosynthesis under adverse conditions in the unfavorable season. Such a trade-off would be consistent with the observed trade-off between maximum speed and endurance in athletes and some animals that has been explained by cost-benefit theory. This trend would have importance for the general understanding of leaf design, and would simplify models of annual leaf carbon relations. We tested for such a trade-off using a database analysis across vascular plants and using an experimental approach for 29 cycad species, representing an ancient plant lineage with diversified evergreen leaves. In both tests, a higher photosynthetic rate per mass or per area in the favorable season was associated with a stronger absolute or percent decline in the unfavorable season. We resolved a possible mechanism based on biomechanics and nitrogen allocation; cycads with high leaf toughness (leaf mass per area) and higher investment in leaf construction than in physiological function (C/N ratio) tended to have lower warm season photosynthesis but less depression in the cool season. We propose that this trade-off, consistent with cost-benefit theory, represents a significant physio-phenological constraint on the diversity and seasonal dynamics of photosynthetic rate.