<br>不同发育阶段白杨叶片功能性状的差异,Plants

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不同发育阶段白杨叶片功能性状的差异
Plants ( IF 4.0 ) Pub Date : 2023-06-09 , DOI: 10.3390/plants12122262
Juntuan Zhai ₁ , Xiao Zhang ₁ , Zhijun Li ₁ , Xiaoli Han ₁ , Shanhe Zhang ₁

Affiliation

白杨具有异型叶的生物学特性，是防风固沙的先锋树种。灰树不同发育阶段异形叶的功能和冠层高度尚不清楚。为了阐明发育阶段和冠层高度如何影响叶片的功能特征，本研究评估了2、4、6、8、10和12 m叶片的形态解剖结构和生理指标。还分析了功能性状与叶片发育阶段和冠层高度的关系。结果表明：叶片长度（BL）、叶片宽度（BW）、叶面积（LA）、叶片干重（LDW）、叶片厚度（LT）、栅栏组织厚度（PT）、净光合速率（Pn）、气孔电导（Gs）、脯氨酸（Pro）和丙二醛（MDA）含量随着发育阶段的进展而增加。 BL、BW、LA、叶片干重、LT、PT、Pn、Gs、Pro以及MDA、吲哚乙酸、玉米素核苷含量与叶片冠层高度及发育阶段呈显着正相关。随着冠层高度的增加和发育阶段的进行，白杨叶片的形态结构和生理特征表现出更明显的耐旱结构特征和更高的光合能力。通过各功能性状的相互调节，提高资源利用效率和抵御环境胁迫的能力。

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Differences in the Functional Traits of Populus pruinosa Leaves in Different Developmental Stages

Populus pruinosa Schrenk has the biological characteristics of heteromorphic leaves and is a pioneer species for wind prevention and sand fixation. The functions of heteromorphic leaves at different developmental stages and canopy heights of P. pruinosa are unclear. To clarify how developmental stages and canopy height affect the functional characteristics of leaves, this study evaluated the morphological anatomical structures and the physiological indicators of leaves at 2, 4, 6, 8, 10, and 12 m. The relationships of functional traits to the developmental stages and canopy heights of leaves were also analyzed. The results showed that blade length (BL), blade width (BW), leaf area (LA), leaf dry weight (LDW), leaf thickness (LT), palisade tissue thickness (PT), net photosynthetic rate (Pn), stomatal conductance (Gs), proline (Pro), and malondialdehyde (MDA) content increased with progressing developmental stages. BL, BW, LA, leaf dry weight, LT, PT, Pn, Gs, Pro, and the contents of MDA, indoleacetic acid, and zeatin riboside had significant positive correlations with canopy heights of leaves and their developmental stages. The morphological structures and physiological characteristics of P. pruinosa leaves showed more evident xeric structural characteristics and higher photosynthetic capacity with increasing canopy height and progressive developmental stages. Resource utilization efficiency and the defense ability against environmental stresses were improved through mutual regulation of each functional trait.

更新日期：2023-06-10

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