Initial stomatal conductance increases photosynthetic induction of trees leaves more from sunlit than from shaded environments: A meta-analysis.

IF 3.5 2区 农林科学 Q1 FORESTRY
Huixing Kang, Yuan Yu, Xinran Ke, Hajime Tomimatsu, Dongliang Xiong, Louis Santiago, Qingmin Han, Reki Kardiman, Yanhong Tang
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Abstract

It has long been held that tree species/leaves from shaded environments show faster rate of photosynthetic induction than species/leaves from sunlit environments. But the evidence so far is conflicting and the underlying mechanisms are still under debate. To address the debate, we compiled a dataset for 87 tree species and compared the initial increasing slope during the first 2-minute induction (SA) and stomatal and biochemical characteristics between sun and shade species from the same study, and those between sun and shade leaves within the same species. In 77% of between-species comparisons, the species with high steady-state photosynthetic rate in the high light (Af) exhibited a larger SA than the species with low Af. In 67% within-species comparisons, the sun leaves exhibited a larger SA than the shade leaves. However, in only a few instances did the sun species/leaves more rapidly achieve 50% of full induction, with an even smaller SA, than the shade species/leaves. At both the species and leaf level, SA increased with increasing initial stomatal conductance before induction (gsi). Despite exhibiting reduced intrinsic water use efficiency in low light, a large SA proportionally enhances photosynthetic carbon gain during the first 2-minute induction in the sun species and leaves. Thus, in terms of the increase in absolute rate of photosynthesis, tree species/leaves from sunlit environments display faster photosynthetic induction responses than those from shaded environments. Our results call for re-consideration of contrasting photosynthetic strategies in photosynthetic adaption/acclimation to dynamic light environments across species.

初始气孔导度对树叶光合作用诱导的增加作用,来自阳光环境的大于来自阴影环境的:荟萃分析
长期以来,人们一直认为阴暗环境中的树种/叶片比阳光环境中的树种/叶片光合作用诱导速度更快。但迄今为止的证据并不一致,其基本机制也仍在争论之中。为了解决这一争论,我们汇编了 87 个树种的数据集,并比较了同一研究中阳光下和阴凉处树种之间以及同一树种中阳光下和阴凉处树叶之间在最初 2 分钟诱导过程中的初始上升斜率(SA)以及气孔和生化特征。在 77% 的物种间比较中,强光下稳态光合速率(Af)高的物种的 SA 值大于 Af 值低的物种。在 67% 的物种内比较中,向阳叶片的 SA 值大于背阴叶片。然而,只有在少数情况下,向阳物种/叶片比背阴物种/叶片更快地达到 50%的完全诱导,SA 甚至更小。在物种和叶片水平上,SA 随诱导前初始气孔导度(gsi)的增加而增加。尽管在弱光下内在水分利用效率降低,但在阳光下的物种和叶片中,大的 SA 会在最初 2 分钟的诱导过程中按比例提高光合增碳量。因此,就光合作用绝对速率的增加而言,来自阳光环境的树种/叶片比来自阴暗环境的树种/叶片显示出更快的光合诱导反应。我们的研究结果要求重新考虑不同物种在光合作用适应/适应动态光照环境方面的对比性光合作用策略。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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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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