Effects of aluminium toxicity on germination of seeds and its correlation with K⁺, Cl^- and Al³⁺ accumulation in radicle and plumule of Oryza sat

摘要

Aluminium at concentrations of 10, 50, 100 and 150 μM inhibited germination of rice and chickpea seeds. Al (10 to 150 μM) decreased accumulation of K + in the radicle and plumule of germinating rice and chickpea seeds from 48 to 96 hrs of treatment. The degree of inhibition increased with the increase in Al concentration. On the other hand, Cl - accumulation was increased in the radicle and plumule of rice and chickpea seedlings following 10 to 150 μM Al treatment. A maximum of 2- to 2.4-folds increase in accumulation of Cl - was observed under Al stress. A 72 hrs exposure to 10 and 100 μM Al caused a 2.3-folds and 3.8-folds increase in accumulation of Al 3+ in the radicle and a 1.6- to 2.0-folds increase of that in the plumule of rice seedlings. In the germinating chickpea seeds, Al treatment caused a 2- to 3.4-folds and a 2- to 3-folds increase in accumulation of Al in the radicle and plumule, respectively. Correlation between Al- induced seed germination with K + , Cl - and Al 3+ accumulation is discussed.