Photosynthetic acclimation, leaf turnover and growth in tree seedlings suddenly exposed to gaps in Jamaican montane rainforest

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-03-21 DOI:10.1017/s0266467424000051

Tom Ball, Edmund Tanner

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Abstract

Mature leaves of tree seedlings were exposed to high light in four experimental gaps in the Jamaican upper montane rainforest (UMRF). Two of the six species studied were light-demanders: Alchornea latifolia and Clethra occidentalis. Two were gap-favoured: Pittosporum undulatum (an invasive) and Palicourea alpina (a subcanopy shrub). One was intermediate: Hedyosmum arborescens, and one was shade-tolerant: Guarea glabra. After five months, the following significant changes occurred in shade leaves that were exposed to gaps (‘shade-to-gap’ leaves; values as % of those in the pre-gap shade): maximum rate of photosynthesis + 40% (Alchornea), +35% (Clethra), −34% (Pittosporum), +72% (Palicourea); dark respiration +120% (Alchornea), +140% (Clethra), +60% (Pittosporum), +233% (Palicourea), +175% (Hedyosmum), +100% (Guarea); leaf thickness +18% (Alchornea), +18% (Clethra), +14% (Palicourea); leaf mass per unit area +18% (Alchornea), +15% (Pittosporum). Leaves produced in the gaps were (as a percentage of total live leaf number) 74% (Alchornea), 71% (Clethra), 50% (Pittosporum), 71% (Palicourea), 62% (Hedyosmum) and 50% (Guarea). Photosynthetic rates of leaves produced in the gaps were 53–120% higher than ‘shade-to-gap’ leaves. Overall, shade leaves on the three native, more light-demanding species (Alchornea, Clethra and Palicourea) showed photosynthetic acclimation, while the more shade-tolerant species (Hedyosmum and Guarea and Pittosporum undulatum) showed little acclimation in shade-to-gap leaves.

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牙买加山地雨林中突然暴露在间隙中的树苗的光合适应、叶片更替和生长情况

在牙买加上山地热带雨林（UMRF）的四个实验间隙中，树苗的成熟叶片暴露在强光下。所研究的六个物种中有两个是需光植物：Alchornea latifolia 和 Clethra occidentalis。两个物种喜间隙：Pittosporum undulatum（一种入侵植物）和 Palicourea alpina（一种亚冠层灌木）。一种处于中间位置：Hedyosmum arborescens，一种耐阴：Guarea glabra。五个月后，暴露在间隙中的遮荫叶片（"遮荫-间隙 "叶片；数值为间隙前遮荫叶片的百分比）发生了以下显著变化：光合作用最大速率 +40%（Alchornea）、+35%（Clethra）、-34%（Pittosporum）、+72%（Palicourea）；暗呼吸 +120%（Alchornea）、+140%（Clethra）、+60%（Pittosporum）、+233%（Palicourea）、+175%（Hedyosmum）、+100%（Guarea）；叶片厚度 +18%（Alchornea），+18%（Clethra），+14%（Palicourea）；单位面积叶片质量 +18%（Alchornea），+15%（Pittosporum）。间隙中长出的叶片（占总活叶片数的百分比）分别为 74%（Alchornea）、71%（Clethra）、50%（Pittosporum）、71%（Palicourea）、62%（Hedyosmum）和 50%（Guarea）。隙间叶片的光合率比 "荫间隙 "叶片高 53-120%。总体而言，三种对光照要求较高的本地物种（Alchornea、Clethra 和 Palicourea）的阴生叶显示出光合适应性，而较耐阴的物种（Hedyosmum、Guarea 和 Pittosporum undulatum）的阴生叶几乎没有显示出光合适应性。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.