幼发幼虫杨树的异形叶片在发育阶段和冠状尺度上的形态，结构和生理差异。,Plant Biology

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幼发幼虫杨树的异形叶片在发育阶段和冠状尺度上的形态，结构和生理差异。
Plant Biology ( IF 4.2 ) Pub Date : 2020-01-05 , DOI: 10.1111/plb.13078
J T Zhai ₁ , Y L Li ₁ , Z J Han ₁ , Z J Li ₁

Affiliation

幼发幼虫杨（Populus euphratica Oliv。）在成熟的树冠中具有从基部到顶部的异形叶，包括带状，披针形，卵形和宽卵形的叶。为了阐明胸高（DBH）和树高的直径如何影响各种异形叶的功能特性，我们在2、4、6、8点测量了五种胡杨冠状异形叶的形态解剖结构和生理指标。，距同一站点10 m和12 m。我们还分析了异型叶片和DBH的形态结构与生理特性之间的关系以及异型叶片的高度。结果表明，与叶片宽度，叶片面积，叶片厚度，单位面积叶片质量，表皮层厚度，栅栏组织厚度有关的异常数量，栅栏组织/海绵组织的比例随大小顺序和采样高度梯度的增加而增加。净光合速率，蒸腾速率，气孔导度，瞬时水分利用效率，稳定的δ碳同位素比，脯氨酸和丙二醛（MDA）含量随DBH和采样高度的增加而增加。相比之下，叶片长度，叶片形状指数和细胞间CO2浓度随路径顺序和采样高度梯度的增加而降低。虽然MDA含量和叶片海绵厚度与DBH或采样高度无关，但其他形态结构和生理参数与这些变量显着相关。此外，还发现叶片形态，解剖结构，生理指标参数表明它们随路径顺序和树高梯度而变化。P异型叶片的形态，解剖结构和生理特性的差异。胡杨与成虫阶段和冠状位有关。

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Morphological, structural and physiological differences in heteromorphic leaves of Euphrates poplar during development stages and at crown scales.

Euphrates poplar (Populus euphratica Oliv.) has heteromorphic leaves including strip, lanceolate, ovate, and broad-ovate leaves from base to top in the mature canopy. To clarify how diameter at breast height (DBH) and tree height affect the functional characteristics of all kinds of heteromorphic leaves, we measured the morphological anatomical structure and physiological indices of five crown heteromorphic leaves of P. euphratica at 2, 4, 6, 8, 10, and 12 m from the same site. We also analysed the relationships between morphological structures and physiological characteristics of heteromorphic leaves and DBH and the height of heteromorphic leaves. The results showed that the number of abnormalities regarding blade width, leaf area, leaf thickness, leaf mass per area, cuticle layer thickness, palisade tissue thickness, and palisade tissue/sponge tissue ratio increased with size order and sampling height gradient. Net photosynthetic rate, transpiration rate, stomatal conductance, instantaneous water use efficiency, stable delta carbon isotope ratio, proline and malondialdehyde (MDA) content increased with DBH and sampling height. By contrast, blade length, leaf shape index, and intercellular CO2 concentration decreased with the increase in path order and sampling height gradient. Although MDA content and leaf sponge thickness were not correlated with DBH or sampling height, other morphological structure and physiological parameters were significantly correlated with these variables. In addition, correlations were found among leaf morphology, anatomical structure, and physiological index parameters indicating that they changed with path order and tree height gradient. The differences in the morphology, anatomic structure and physiological characteristics of the heteromorphic leaves ofP. euphratica are related to ontogenesis stage and coronal position.

更新日期：2020-01-05

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