^22Na^+ and ^36Cl^- Mobility in Salinized Excised Leaves of Several Crop Plants

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Excised leaves of several crop plants were cultured in a nutrient solution containing ^22Na^+ (816 Bq mL^-1) or ^36Cl^- (802 Bq mL^-1), and the mobility of ^22Na^+ and ^36Cl^- between and within organs was investigated. Though ^22Na^+ and ^36Cl^- seemed to be taken up depending on the transpiration in all the examined crops, the distribution pattern of ^22Na^+ and ^36Cl^- and the concomitance between them varied among the crops as follows: 1) Though ^22Na^+ and ^36Cl^- were taken up concomitantly in rice and maize, ^22Na^+ and ^36Cl^- were well distributed all over the leaf in rice and reached the lower half of the leaf blade but moved only over a short distance from the midrib and the brims of the leaf blade in maize. 2) In soybean, ^22Na^+ and ^36Cl^- were well distributed all over the leaf, and the possibility of the preferential intrusion of ^36Cl^- to the leaf was indicated. 3) In adzuki bean, ^22Na^+ and ^36Cl^- were intensely distributed first to the petiole, then to the leaf veins, and finally to the mesophyll. The concomitance between ^22Na^+ and ^36Cl^- could not be determined. 4) In pumpkin, ^22Na^+ and ^36Cl^- were retained in the petiole for transfer to the leaf blade, and ^36Cl^- was taken up preferentially. These results suggested that in the excised leaves, the mobility of Na^+ and Cl^- was affected not only by the transpiration but also by the transport of Na^+ and Cl^- from the xylem to surrounding tissues and / or by the structure of leaf tissues.
社団法人日本土壌肥料学会の論文

^22Na^+ and ^36Cl^- Mobility in Salinized Excised Leaves of Several Crop Plants

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