CELL-WALL PROTEINS AT LOW WATER POTENTIALS
CELL-WALL PROTEINS AT LOW WATER POTENTIALS
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DOI：
10.1104/pp.85.1.261
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发表时间：
1987-09-01
期刊：
影响因子：
7.4
通讯作者：
BOYER, JS
中科院分区：
文献类型：
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作者：
BOZARTH, CS;MULLET, JE;BOYER, JS
我们研究了当植物遭受低水势(低psi.w)时，从茎组织细胞壁中提取的蛋白质。暗色大豆幼苗(Glyine max[L.](Merr.)当根暴露在低水分(psi.w=-3bar)的蛭石中时，茎的生长受到抑制。一段时间后，经济恢复了增长，但增速低于对照组。随着psi.w的减小，细胞壁中的可提取蛋白增加，特别是年轻组织中28千道尔顿的蛋白。相比之下，主要从成熟细胞壁提取的70千道尔顿蛋白质在低psi.w时似乎略有减少。这两种蛋白质中都不存在羟脯氨酸，这表明这两种蛋白质都与延伸素无关。在最初的生长抑制后不久，28kodalton蛋白在分裂区域的细胞壁中的水平增加，大约在恢复生长的时候出现在伸长组织中。生长和这些蛋白质变化之间的相关性表明，这两个事件可能是相关的。
We investigated the proteins extractable from cell walls of stem tissues when plants were subjected to low water potentials (low .psi.w). Dark-grown soybean seedlings (Glycine max [L.] Merr.) showed decreased stem growth when the roots were exposed to vermiculite having low water content (.psi.w = -3 bar). After a time, growth resumed but at a reduced rate relative to the controls. The extractable protein increased in the cell walls as .psi.w decreased, especially a 28-kilodalton protein in the young tissue. In contrast, a 70 kilodalton protein, mainly extractable from mature cell walls, appeared to decrease slightly at low .psi.w. No hydroxyproline was present in either protein, which shows that neither protein is related to extensin. The level of the 28 kilodalton protein increased in the cell wall of the dividing region soon after the initial growth inhibition, and it appeared in the elongating tissue at about the time growth resumed. The correlation between growth and these protein changes suggests that the two events could be related.