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首页> 外文期刊>Development >Balancing division and expansion during maize leaf morphogenesis: analysis of the mutant, warty-1.
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Balancing division and expansion during maize leaf morphogenesis: analysis of the mutant, warty-1.

机译：平衡玉米叶片形态发生过程中的分裂和扩张：突变体warty-1的分析。

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摘要

Cell division and expansion are growth events that contribute to the developing shape, or morphogenesis, of a plant. Division and expansion are coordinated to the extent that plant organs, such as leaves, generally portray a predictable cellular pattern. To dissect the relationship between division and expansion, and to test for the role of each during morphogenesis, we have identified a recessive mutation warty-1 that produces a primary defect in cell size and shape in mutant leaves. Warty-1 mutant plants are similar to non-mutant siblings in terms of flowering time, overall plant size and leaf shape. Mature adult leaves have raised warts, consisting of excessively enlarged cells, that appear in patchy distribution throughout the blade. Cell wall deposition is abnormal or incomplete, suggesting cytokinesis is also affected, either directly or indirectly. Cells first increase in size at specific positions, which correspond to predictable cell dimensions of a developing 1 cm leaf. Once mutant cells exceed 133% normal size, cytokinesis becomes abnormal. As differentiation progresses, cells that appear normal in the mutant are actually dividing faster and are smaller than comparable cells in non-mutant siblings. These results suggest that (1) cells may compensate for growth defects by altering their cell cycle and that (2) proper execution of cytokinesis may require that cell size ratios are properly maintained.
机译：细胞分裂和扩增是有助于植物发育形状或形态发生的生长事件。分裂和扩张在某种程度上协调到植物器官（例如叶子）通常描绘出可预测的细胞模式。为了剖析分裂与扩张之间的关系，并测试每个词在形态发生过程中的作用，我们确定了一种隐性突变warty-1，该突变在突变叶片的细胞大小和形状中产生了主要缺陷。 Warty-1突变植物在开花时间，总体植物大小和叶片形状方面与非突变兄弟姐妹相似。成熟的成年叶片上有疣，由过度膨大的细胞组成，整个叶片呈斑片状分布。细胞壁沉积异常或不完整，表明胞质分裂也直接或间接受到影响。细胞首先在特定位置增加大小，这对应于正在发育的1 cm叶的可预测细胞大小。一旦突变细胞超过正常大小的133％，胞质分裂就会异常。随着分化的进展，在突变体中看起来正常的细胞实际上分裂得更快，并且比非突变体同胞中的可比细胞要小。这些结果表明（1）细胞可以通过改变细胞周期来补偿生长缺陷，并且（2）胞质分裂的正确执行可能需要适当维持细胞大小比率。

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