Developmental basis of interspecific differences in leaf size and specific leaf area among C3 grass species
Developmental basis of interspecific differences in leaf size and specific leaf area among C3 grass species
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DOI：
10.1111/j.1365-2435.2005.01044.x
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发表时间：
2005-12
影响因子：
5.2
通讯作者：
S. Sugiyama
中科院分区：
文献类型：
--
作者：
S. Sugiyama
1叶大小和比叶面积是决定植物生态功能的主要性状。这些叶片性状的差异的特点是在叶片发育过程中的细胞分裂，扩展和成熟过程。在这项研究中，16个C3草种生长在受控环境下，和各种细胞分裂和伸长参数的叶生长区获得的运动学方法，研究细胞机制的种间差异，叶长和比叶面积。2种间叶长差异为3倍。这种叶长的差异与叶分生组织中分裂细胞的数量密切相关。叶分生组织中的细胞分裂活动也影响成熟细胞的长度。细胞分裂活性高的物种叶肉细胞较小，主要是由于细胞伸长期短。事实上，70%的成熟细胞长度的变化是由细胞分裂活动的解释表明，细胞大小的决定是更强烈的影响发育过程比特定的基因影响细胞大小。3细胞分裂和伸长活动对SLA的影响不明显。然而，具有高水平的分裂活动的物种有较高的叶片含水量和较低的叶片干物质浓度比低水平的分裂活动的物种。4本研究结果揭示了叶分生组织细胞周期调控在决定禾本科植物叶片大小和SLA种间差异中的重要性。
Summary 1Leaf size and specific leaf area (SLA) are major traits in determining a plant's ecological functions. Differences in these leaf traits are characterized by cell division, expansion and maturation processes during leaf development. In this study, 16 C3 grass species were grown under controlled environments, and various cell division and elongation parameters in the leaf growth zone were obtained by a kinematic method to examine cellular mechanisms underlying interspecific differences in leaf length and specific leaf area. 2Leaf length showed a threefold difference among species. This difference in leaf length was closely associated with the number of dividing cells in the leaf meristem. Cell division activity in the leaf meristem also influenced mature cell length. Species with high levels of cell division activity had smaller mesophyll cells, mainly caused by a short cell elongation period. The fact that 70% of the variation in mature cell length was explained by cell division activity suggests that cell size determination is more strongly influenced by the developmental processes than by specific genes affecting cell size. 3Cell division and elongation activities did not have clear effects on SLA. However, species with high levels of division activity had higher leaf water content and lower leaf dry matter concentration than did species with low levels of division activity. 4The results of this study reveal the importance of cell-cycle regulation in the leaf meristem in determining interspecific differences in leaf size and SLA among grass species.