Jinfeng Wang, Bader O Almutairi, Lin Wang, Peijian Shi, Weihao Yao, Ülo Niinemets
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The bootstrap percentile method was used to test the significance of the differences in the scaling exponents of <i>M</i> versus <i>A</i> between the two light environments. The scaling exponents of cotyledons at both two sites, as well as the primary leaves at the shade site, were greater than unity indicating 'diminishing returns', while the scaling exponent of primary leaves at the open site was smaller than unity indicating 'increasing returns'. The data collectively indicated light-dependent shifts in support investments and differences in the function of cotyledons and primary leaves. Average leaf structural traits displayed significant differences between the two light environments in accordance with the premium in enhancing photosynthetic capacity in high light and light interception in low light. Although the trait responses to light availability were similar for primary leaves and cotyledons, primary leaves were more responsive to light availability, indicating lower plasticity of cotyledons in response to light levels. 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引用次数: 0
摘要
子叶在早期育苗过程中发挥着重要作用。然而,与主叶相比,子叶往往具有不同的投资回报策略。为了检测子叶和主叶在不同光照环境下的质量(M)与面积(A)比例关系的潜在差异,我们在开阔地(n = 52;光照充足率:74 ± 5 %)和阴暗地(n = 23;光照充足率:4.2 ± 1.2 %)共取样 75 株槭树幼苗。还原主轴回归方案用于拟合主叶和子叶的 M 与 A 的比例关系。采用引导百分位数法检验两种光照环境下 M 与 A 的比例指数差异的显著性。两个地点的子叶以及阴凉地点的主叶的缩放指数均大于统一值,表明 "收益递减",而开阔地点的主叶的缩放指数小于统一值,表明 "收益递增"。这些数据共同表明,支持投资的变化以及子叶和主叶功能的差异与光有关。平均叶片结构特征在两种光照环境下显示出显著差异,这与在强光下提高光合能力和在弱光下提高光拦截能力有关。虽然主叶和子叶对光照的性状反应相似,但主叶对光照的反应更大,这表明子叶对光照水平的可塑性较低。这些结果加深了我们对子叶和主叶在不同森林光照环境下幼苗生活史中的作用的理解。
Scaling of cotyledon and primary leaf mass versus area in Acer platanoides seedlings under different light conditions.
Cotyledons play an important role in early seedling establishment. However, relative to primary leaves, cotyledons tend to have a different investment-on-return strategy. To detect the potential differences in the mass (M) versus area (A) scaling relationships between cotyledons and primary leaves in different light environments, a total of 75 Acer platanoides seedlings were sampled at an open site (n = 52; light availability: 74 ± 5 %) and a shaded site (n = 23; light availability: 4.2 ± 1.2 %). Reduced major axis regression protocols were used to fit the M versus A scaling relationships of primary leaves and cotyledons. The bootstrap percentile method was used to test the significance of the differences in the scaling exponents of M versus A between the two light environments. The scaling exponents of cotyledons at both two sites, as well as the primary leaves at the shade site, were greater than unity indicating 'diminishing returns', while the scaling exponent of primary leaves at the open site was smaller than unity indicating 'increasing returns'. The data collectively indicated light-dependent shifts in support investments and differences in the function of cotyledons and primary leaves. Average leaf structural traits displayed significant differences between the two light environments in accordance with the premium in enhancing photosynthetic capacity in high light and light interception in low light. Although the trait responses to light availability were similar for primary leaves and cotyledons, primary leaves were more responsive to light availability, indicating lower plasticity of cotyledons in response to light levels. These results advance our understanding of the roles of cotyledons and primary leaves in the life history of seedlings in different forest light environments.
期刊介绍:
AoB PLANTS is an open-access, online journal that has been publishing peer-reviewed articles since 2010, with an emphasis on all aspects of environmental and evolutionary plant biology. Published by Oxford University Press, this journal is dedicated to rapid publication of research articles, reviews, commentaries and short communications. The taxonomic scope of the journal spans the full gamut of vascular and non-vascular plants, as well as other taxa that impact these organisms. AoB PLANTS provides a fast-track pathway for publishing high-quality research in an open-access environment, where papers are available online to anyone, anywhere free of charge.