Differential photosynthetic plasticity of Amazonian tree species in response to light environments

IF 4.2 3区生物学 Q1 PLANT SCIENCES

Plant Biology Pub Date : 2024-03-15 DOI:10.1111/plb.13632

A. d. R. Nina Junior, J. M. F. Maia, S. V. C. Martins, N. V. dos Santos Nina, K. C. P. da Costa, J. C. de Carvalho, M. Schramm Mielke, A. Nunes-Nesi, W. L. Araújo, J. F. de Carvalho Gonçalves

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Abstract

To investigate how and to what extent there are differences in the photosynthetic plasticity of trees in response to different light environments, six species from three successional groups (late successional, mid-successional, and pioneers) were exposed to three different light environments [deep shade – DS (5% full sunlight – FS), moderate shade – MS (35% FS) and full sunlight – FS].
Maximum net photosynthesis (A_max), leaf N partitioning, stomatal, mesophile, and biochemical limitations (SL, ML, and BL, respectively), carboxylation velocity (V_cmax), and electron transport (J_max) rates, and the state of photosynthetic induction (IS) were evaluated.
Higher values of A_max, V_cmax, and J_max in FS were observed for pioneer species, which invested the largest amount of leaf N in Rubisco. The lower IS for pioneer species reveals its reduced ability to take advantage of sunflecks. In general, the main photosynthetic limitations are diffusive, with SL and ML having equal importance under FS, and ML decreasing along with irradiance. The leaf traits, which are more determinant of the photosynthetic process, respond independently in relation to the successional group, especially with low light availability.
An effective partitioning of leaf N between photosynthetic and structural components played a crucial role in the acclimation process and determined the increase or decrease of photosynthesis in response to the light conditions.

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亚马逊树种对光环境的光合作用可塑性差异。

为了研究不同光照环境下树木光合作用可塑性的差异及其程度，我们将三个演替组（晚演替组、中演替组和先锋组）的六个物种暴露在三种不同的光照环境中[深遮荫--DS（5%全日照--FS）、中度遮荫--MS（35%全日照--FS）和全日照--FS]。对最大净光合作用（Amax）、叶片氮分配、气孔、中间嗜碱性和生化限制（分别为 SL、ML 和 BL）、羧化速度（Vcmax）和电子传输速率（Jmax）以及光合诱导状态（IS）进行了评估。先驱物种在 FS 中的 Amax、Vcmax 和 Jmax 值较高，因为它们在 Rubisco 中投入的叶片 N 量最大。先驱物种的 IS 值较低，表明其利用日照裂隙的能力较弱。总的来说，主要的光合作用限制是扩散性的，在 FS 条件下，SL 和 ML 具有同等重要性，ML 随辐照度的降低而降低。对光合作用过程起决定作用的叶片性状与演替组别有关，尤其是在低光照条件下，叶片性状的反应是独立的。叶片氮在光合作用和结构成分之间的有效分配在适应过程中发挥了关键作用，并决定了光合作用在光照条件下的增减。

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来源期刊

Plant Biology 生物-植物科学

CiteScore

8.20

自引率

2.60%

发文量

109

审稿时长

3 months

期刊介绍： Plant Biology is an international journal of broad scope bringing together the different subdisciplines, such as physiology, molecular biology, cell biology, development, genetics, systematics, ecology, evolution, ecophysiology, plant-microbe interactions, and mycology. Plant Biology publishes original problem-oriented full-length research papers, short research papers, and review articles. Discussion of hot topics and provocative opinion articles are published under the heading Acute Views. From a multidisciplinary perspective, Plant Biology will provide a platform for publication, information and debate, encompassing all areas which fall within the scope of plant science.