Abstract
The effect of root pruning on Na^+ exclusion in rice plant under NaCl-stress condition was investigated. Top Na content of KR1 and IR28 was increasad by pruning the tips of crown roots or branched roots. Na^+ exclusion rate, expressed as the TSCFNa^+, was decreased by root pruning. From these results, it was suggested that treatment solution was taken up into xylem with massflow through the cut surface. These results support the possibility that the sites of ion exclusion in rice root were mainly the exodermis and endodermis. Top Na content of young leaf increased by pruning of young roots. It showed that leaf Na content was closely affected by the root which belong to the same phytomer under saline condition.
