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首页> 外文期刊>Journal of Botany >A Comparative Analysis of the Mechanical Role of Leaf Sheaths of Poaceae, Juncaceae, and Cyperaceae
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A Comparative Analysis of the Mechanical Role of Leaf Sheaths of Poaceae, Juncaceae, and Cyperaceae

机译：禾本科，Jun科和莎草科的叶鞘力学作用的比较分析

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Similarities in structural organization of the culm in Poaceae, Juncaceae, and Cyperaceae such as leaf sheaths and the presence of intercalary meristems at every node suggest the same mechanical properties and, accordingly, the same functionality. Meristems are zones of tissue formation, which constitute areas of weakness along the entire culm and provide the basis for rapid shoot elongation. Leaf sheaths clasp the culm preventing the shoot from breaking, ensuring the rigidity to grow erectly and to avoid damage of the meristematic tissue. The mechanical influence of leaf sheaths was investigated in members of Poaceae, Juncaceae, and Cyperaceae in the flowering stage. Mechanical properties ofPoa araratica,Bromus erectus,Arrhenatherum elatius(Poaceae),Luzula nivea(Juncaceae), andCarex arctata(Cyperaceae) were determined in three-point bending before and after the removal of leaf sheaths. The presence of leaf sheaths results in smoothing the distribution of flexural rigidity and therefore avoids stress peaks. The achieved maxima of relative contribution of leaf sheaths to entire flexural rigidity ranged from 55% up to 81% for Poaceae, 72% forC. arctata, and 40% forL. nivea. Across the investigated families, the mechanical role of leaf sheaths could be verified as essential for culm stability during development and beyond.
机译：禾本科，Jun科和莎草科的茎的结构组织相似，例如叶鞘和在每个节上存在cal生分生组织表明相同的机械性能，因此具有相同的功能。分生组织是组织形成的区域，构成整个茎秆的薄弱区域，并为快速芽伸长提供了基础。叶鞘扣紧茎秆，防止芽破裂，确保其直立生长的刚性，并避免分生组织的损坏。在开花期，对禾本科，菊科和莎草科的成员研究了叶鞘的机械影响。在去除叶鞘之前和之后的三点弯曲试验中测定了阿拉伯大果早熟禾，直立大花,、大戟科，菊科和莎草（Caryperaceae）的力学性能。叶鞘的存在使抗弯刚度的分布变得平滑，因此避免了应力峰值。叶鞘对整个抗弯刚度的相对贡献达到的最大值范围从禾本科的55％到81％，碳的72％。 Arctata，L占40％。妮维雅。在所有调查的科中，叶鞘的机械作用可以被证实对于发育期间及以后的茎秆稳定性至关重要。

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