Effects of Low pH and Al on Absorption and Translocation of Some Essential Nutrients in Excised Barley Roots

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概要

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• Effects of low pH(3.8)and Al(200 μmol L^<-1> soluble Al, pH 3.8)on the absorption and translocation of P, K(^<86>Rb), Ca, Mn, and Zn in roots excised from 5-d old barley seedlings were examined using a multi-compartment transport box and radioisotopes. Effects of pH and Al on the nutrient absorption were first examined, with emphasis placed on the accumulation, cortical efflux, redistribution and xylem exudation fractions. Radioactive tracers were applied in two different root zones, the apex(0 to 10 mm from tip)and the translocation peak zones(root zones between 13 to 50 mm from the tip, where absorbed nutrients are translocated more efficiently as compared to the apex)of the respective nutrients in barley roots. When a radioactive target ion was applied to a root apex, the rate of accumulation was apparently highest among all the absorbed fractions, and this phenomenon is common to all the present treatments(-Al at pH 5.5, -Al at pH 3.8, and +Al at pH 3.8)except for the case of Ca. The absorption and translocation of the nutrients in the root apex and the translocation peak zones were inhibited by a low pH, and the inhibition was severe for Zn and silght for P and K(^<86>Rb). The presence of Al in the ambient solution clearly inhibited the absorption and translocation of Ca and Mn in both loading zones. In contrast, Al in the low pH ambient solution enhanced P absorption, by increasing both rates of the accumulation and the translocation in the apex and the translocation peak zones. Similarly, Al stimulated the absorption and translocation of K(^<86>Rb)in both loading zones. Despite the differences in the magnitude of inhibition or stimulation in the accumulation, cortical efflux, redistribution and xylem exudation fractions in both loading zones, the effect of a low pH or a low level of Al on nutrient absorption appeared to be uniform throughout a certain area of young barley roots.

• 社団法人日本土壌肥料学会の論文

著者

• YOKOYAMA Kazuhira

  Faculty of Agriculture, Yamaguchi University

• Malkanthi Dugganna

  Faculty Of Agriculture Kagawa University:(present Address)faculty Of Agriculture University Of Perad

• Yokoyama K

  Department Of Biological Chemistry Faculty Of Agriculture Yamaguchi University

• Yokoyama Kazuhira

  Faculty Of Agriculture Kyushu University

• Moritsugu Masumi

  Faculty of Agriculture, Kagawa University

• Yokoyama Kazuhira

  Department Of Biological Science Faculty Of Agriculture Yamaguchi University

• Moritsugu M

  Faculty Of Agriculture Kagawa University

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