Effects of water stress on sorbitol content in leaves and roots, anatomical changes in cell nuclei, and starch accumulation in leaves of young peach trees
Effects of water stress on sorbitol content in leaves and roots, anatomical changes in cell nuclei, and starch accumulation in leaves of young peach trees
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DOI：
10.2503/jjshs.73.25
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发表时间：
2004-01-01
影响因子：
--
通讯作者：
Nii, N
中科院分区：
文献类型：
--
作者：
Cui, SM;Sadayoshi, K;Nii, N
研究了水分胁迫对“Ohatsumomo”桃幼苗叶和根中山梨醇含量的影响，以及叶细胞中细胞核和淀粉积累的解剖学变化。水分胁迫程度分为四个级别：无胁迫地块（对照）、弱胁迫地块（w - 地块）、轻度胁迫地块（m - 地块）和重度胁迫地块（s - 地块）。水分胁迫的程度通过叶片枯萎的程度来判断，并通过叶片的水分饱和度（WSD）来估计。水分胁迫增加了叶子中的山梨醇含量，但不增加根中的山梨醇含量。尽管随着水分胁迫的增加，叶片的 WSD 显着增加，但干旱处理仅导致叶片中山梨醇含量略有差异。浇水一天后，处理的山梨醇含量下降到与未受胁迫的树木相似的水平。浇水后w-地块和m-地块有少量叶子脱落；但小块地的叶子脱落严重，一些树木死亡。叶肉薄壁组织中的淀粉积累随着水分胁迫的增加而减少。从水分胁迫中恢复后，淀粉粒再次在叶子中积累。仅在 s 图中观察到叶肉薄壁组织中的核降解，而在 w 和 m 图中未观察到。
The effects of water stress on sorbitol content in the leaves and roots of young 'Ohatsumomo' peach seedlings, as well as anatomical changes to nuclei and starch accumulation in the cells of the leaves were investigated. The degree of water stress was graded into four levels: unstressed plots (control), weakly stressed plots (w - plots), mildly stressed plots (m -plots) and severely stressed plots (s - plots). The degree of water stress was judged by the extent of the leaves wilted and was estimated by the water saturation deficiency (WSD) of the leaves. Water stress increased sorbitol content in leaves but not in roots. Although the WSD of the leaves increased significantly with increasing water stress, drought treatment caused only slight differences in sorbitol content in the leaves. One day after watering, the sorbitol content of the treatments decreased to the levels similar to those of unstressed trees. Few leaves of w - plots and m - plots abscised after watering; but leaves of s-plots abscised severely, and some trees died. Starch accumulation in the mesophyll parenchyma decreased with increasing water stress. After recovery from water stress, starch grains accumulated again in the leaves. Nuclear degradation in the mesophyll parenchyma was observed only in s - plots but not in the w - and m - plots.