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22Na+ and 36Cl- mobility in salinized excised leaves of several crop plants
Ist Teil von
Soil science and plant nutrition (Tokyo), 2002-02, Vol.48 (1), p.23-29
Ort / Verlag
Tokyo: Taylor & Francis Group
Erscheinungsjahr
2002
Link zum Volltext
Quelle
Taylor & Francis Journals Auto-Holdings Collection
Beschreibungen/Notizen
Excised leaves of several crop plants were cultured in a nutrient solution containing sup22 Na**+ (816 Bq mL sup-1)or sup36 Cl**- (802 Bq mL sup-1), and the mobility of 22Na**+ and sup36 Cl**- between and within organs was investigated. Though sup22 Na**+ and sup36 Cl**- seemed to be taken up depending on the transpiration in all the examined crops, the distribution pattern of sup22 Na**+ and sup36 Cl**- and the concomitance between them varied among the crops as follows: 1) Though sup22 Na**+ and sup36 Cl**- were taken up concomitantly in rice and maize, sup22 Na**+ and sup36 Cl**- 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, sup22 Na**+ and sup36 Cl**- were well distributed all over the leaf, and the possibility of the preferential intrusion of sup36 Cl**- to the leaf was indicated. 3) In adzuki bean, sup22 Na**+ and sup36 Cl**- were intensely distributed first to the petiole, then to the leaf veins, and finally to the mesophyll. The concomitance between sup22 Na**+ and sup36 Cl**- could not be determined. 4) In pumpkin, sup22 Na**+ and sup36 Cl**- were retained in the petiole for transfer to the leaf blade, and sup36 Cl**- 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.