Abstract
To elucidate aluminum (Al) tolerance mechanism in rice, we investigated the relationship between root elongation inhibition and Al accumulation in roots and shoots, in two-rice varieties, Koshihiakri (Al tolerant) and Kasalath (Al sensitive). Fifty percent inhibition of root elongation was caused with 50μM Al in Koshihikari and with 15μM Al in Kasalath during the exposure to Al from 5h to 24h. Under the treatment conditions, Al content in root apex was almost the same level in these varieties.
However, Koshihikari also accumulated Al in shoots, which was not clearly observed in Kasalath.
These results indicate that the Al-induced inhibition of root elongation is closely related to the content of Al accumulated in root apex in these varieties and that higher tolerance to Al in Koshihikari than Kasalath may be related to the higher capability of Koshihikari to translocate Al from root to shoot.
