Ultraviolet‐B radiation reduces the rates of cell division and elongation in the primary leaf of wheat (Triticum aestivum L. cv Maris Huntsman)
Ultraviolet‐B radiation reduces the rates of cell division and elongation in the primary leaf of wheat (Triticum aestivum L. cv Maris Huntsman)
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DOI：
10.1046/j.1365-3040.2002.00834.x
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发表时间：
2002-05
影响因子：
7.3
通讯作者：
L. Hopkins;M. Bond;A. Tobin
中科院分区：
文献类型：
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作者：
L. Hopkins;M. Bond;A. Tobin
小麦（Triticum aestivum L.）cv Maris Huntsman）用作模型系统以检查升高的紫外线-B（UV-B; λ= 280-320 nm）辐射如何影响生长。初级叶的生长速度和持续时间的减少，在响应UV-B，是细胞分裂和伸长的速度和程度的变化的结果。UV-B减少了有丝分裂活跃细胞的比例（有丝分裂指数），并增加了细胞分裂所需的时间（细胞倍增时间）。因此，进入伸长区的细胞供应减少，这与伸长速率的降低相结合，导致叶片生长减少。这种生长空间分布的分析提供了一种计算叶片内细胞年龄的方法。UV-B处理的叶片细胞比对照衰老得更快。这一分析将使未来的研究考虑到年龄相关的变化时，解释植物对任何数量的环境压力，影响叶片发育的反应。
The primary leaf of wheat (Triticum aestivum L. cv Maris Huntsman) was used as a model system to examine how elevated ultraviolet-B (UV-B; λ= 280–320 nm) radiation affected growth. A reduction in the rate and duration of growth of the primary leaf, in response to UV-B, was the result of changes in both the rate and extent of cell division and elongation. UV-B reduced the proportion of mitotically active cells (mitotic index) and increased the time taken for cell division (cell doubling time). Thus the supply of cells into the elongation zone was reduced, and this, coupled to a reduction in the rate of elongation, resulted in reduced leaf growth. This analysis of the spatial distribution of growth provided a means of calculating the age of cells within the leaves. Cells of UV-B-treated leaves were found to age more quickly than those of the controls. This analysis will enable future studies to take account of age-related changes when interpreting the response of plants to any number of environmental stresses that affect leaf development.