RELATIONSHIP BETWEEN DIFFERENTIAL ALUMINUM TOLERANCE AND PLANTINDUCED pH CHANGE OF MEDIUM AMONG BARLEY CULTIVARS
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概要
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Five barley cultivars were grown together in complete, low-P・low-pH and high-Al medium containing only NO_3, only NH_4 or both NO_3 and NH_4 as N sources, respectively using an automatic control system of pH for water culture, and the relationship between the differential Al tolerance and the plant-induced pH change of medium among the barley cultivars was investigated. The pH of the medium containing only NO_3 as N source tended to increase, whereas the pH of the other media containing only NH_4 or both NO_3 and NH_4 as N sources tended to decrease, but the fluctuations of the medium pH could be maintained within the value of 0.2 pH in the complete medium and within the value of 0.1 pH in the high-Al medium. Barley cultivars still differed in their Al tolerance in the medium which was continuously stirred and circulated at a constant pH. The pattern of Al tolerance was not affected by the N sources in the medium. The plant-induced pH change of medium for each cultivar was influenced by the N sources in the medium, and was not correlated positively with Al tolerance. The contents of Al and Ca or other nutrient cations in roots were positively correlated with Al tolerance, and positive correlations were recognized also between the contents of Al and Ca or some other nutrient cations in the roots. In conclusion, the following mechanisms are proposed. Al tolerant barley cultivars exclude Al actively outside the plasmalemma of the root cells, and the excluded Al may polymerize and/or react with P to form Al precipitates. Consequently, in the Al tolerant barley cultivars the Al content may be low in the root protoplasts, high in the whole root tissues and the contents of Ca or other nutrients may be high in the roots. The plant-induced pH change of medium is not considered to be the cause of the differential Al tolerance among barley cultivars.
- 社団法人日本土壌肥料学会の論文
著者
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Wagatsuma Tadao
Faculty Of Agriculture
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YAMASAKU Keiko
Faculty of Agriculture, Yamagata University
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Yamasaku Keiko
Faculty Of Agriculture Yamagata University
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