期刊
PHYSIOLOGIA PLANTARUM
卷 120, 期 1, 页码 106-112出版社
WILEY
DOI: 10.1111/j.0031-9317.2004.0206.x
关键词
-
The changes in osmotic potential and the concentration of osmotic solutes in the cell sap of the root tips exposed to Al were examined in two cultivars of wheat (Triticum aestivum) differing in Al resistance. Root elongation was less influenced by an 8-h exposure to 20 muM or 50 muM Al in Al-resistant cv. Atlas 66 than in Al-sensitive cv. Scout 66. After Al treatment the osmotic potential of the root cells was decreased in Atlas 66 but increased in Scout 66 indicating that the Al treatment osmotically stimulated the driving force for water uptake in Atlas 66 but suppressed it in Scout 66. Al increased the concentration of soluble sugars, the major osmotic solute in the root cells in Atlas 66, but decreased it in Scout 66. Al at both low (5 muM) and high (50 muM) concentrations, also increased the concentration of soluble sugars in the Al-resistant genotype ET8 but a high Al concentration decreased it in Al-sensitive genotype ES8. Enzymatic analyses and thin-layer chromatography revealed that soluble sugars in the root cells of both Atlas 66 and Scout 66 mainly consisted of monosaccharides such as glucose, fructose and a small amount of sucrose. These results suggest that the accumulation of soluble sugars in Al-resistant wheat Atlas 66 keeps the osmotic potential in the root cells low and thus, enables the root cells to take up water and to elongate against the pressure produced by cell wall rigidification under Al stress.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据