Variability in Populus leaf anatomy and morphology in relation to canopy position, biomass production, and varietal taxon
Variability in Populus leaf anatomy and morphology in relation to canopy position, biomass production, and varietal taxon
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DOI：
10.1051/forest:2007029
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发表时间：
2007-07-01
影响因子：
3
通讯作者：
Ceulemans, Reinhart
中科院分区：
文献类型：
--
作者：
Al Afas, Najwa;Marron, Nicolas;Ceulemans, Reinhart
在高密度矮林培养的第二次轮作的第三个生长季节，对属于不同类群以及 Aigeiros 和 Tacamahaca 部分的 12 种杨树 (Populus) 基因型进行了研究。为了强调叶子性状、生物量生产和分类群之间的关系以及冠层位置的影响，对所有基因型和两个冠层位置（上冠层和下冠层）的成熟叶片检查了叶片的解剖和形态特征（即表皮、栅栏和海绵薄壁组织层的厚度、气孔的密度和长度、叶面积、比叶面积（SLA）和氮浓度）。地上生物量产量、解剖性状、气孔和形态叶特征在基因型之间和冠层位置之间存在显着差异。对于所有基因型，无论冠层位置如何，海绵薄壁组织层都比栅栏薄壁组织层厚，除了属于 P. deltoides x P. nigra 分类单元（Aigeiros 部分）的基因型。冠层上部位置的叶子比冠层下部位置的叶子具有更高的气孔密度和更厚的解剖层。从冠层底部到顶部，叶面积和氮浓度逐渐增加，而SLA逐渐减少。发现生物量产量与远轴气孔密度之间以及生物量产量与氮浓度之间呈正相关。主成分分析（PCA）显示，属于同一分类单元的基因型具有相似的解剖特征，同一科的基因型也表现出共同的叶片特征。然而，Wolterson (P. nigra) 的叶子解剖特征与属于同一科（Aigeiros 科）的其他基因型不同。两个部分之间的杂交种（Aigeiros x Tacamahaca）表现出介于两个部分之间的叶片特征，但其生物量产量较低。
Twelve poplar (Populus) genotypes, belonging to different taxa and to the sections Aigeiros and Tacamahaca, were studied during the third growing season of the second rotation of a high density coppice culture. With the objective to highlight the relationships between leaf traits, biomass production and taxon as well as the influence of canopy position, anatomical and morphological leaf characteristics (i. e. thickness of epidermis, of palisade and spongy parenchyma layers, density and length of stomata, leaf area, specific leaf area (SLA) and nitrogen concentration) were examined for mature leaves from all genotypes and at two canopy positions (upper and lower canopy). Above ground biomass production, anatomical traits, stomatal and morphological leaf characteristics varied significantly among genotypes and between canopy positions. The spongy parenchyma layer was thicker than the palisade parenchyma layer for all genotypes and irrespective of canopy position, except for genotypes belonging to the P. deltoides x P. nigra taxon (section Aigeiros). Leaves at the upper canopy position had higher stomatal density and thicker anatomical layers than leaves at the lower canopy position. Leaf area and nitrogen concentration increased from the bottom to the top of the canopy, while SLA decreased. Positive correlations between biomass production and abaxial stomatal density, as well as between biomass production and nitrogen concentration were found. A principal component analysis (PCA) showed that genotypes belonging to the same taxon had similar anatomical characteristics, and genotypes of the same section also showed common leaf characteristics. However, Wolterson (P. nigra) differed in anatomical leaf characteristics from other genotypes belonging to the same section (section Aigeiros). Hybrids between the two sections (Aigeiros x Tacamahaca) expressed leaf characteristics intermediate between both sections, while their biomass production was low.