[Truncated] were undertaken with the Brassica species B.napus and B.rapa to assess the magnitude of genetic variation in Al tolerance and identify efficient strategies for improving the yields of these species on acid soils.
Significant differences in root and shoot growth were detected among 30 B.napus cultivars grown in a glasshouse in acid Wodgil soil (pH 3.8 - 4.0) from the eastern wheatbelt of Western Australia. Tolerance indices obtained from ratios of growth in the acid soil to that of growth in lime-treated acid soil also varied significantly among cultivars. A tolerance index based on root growth ranged from 44 to 81 % over all cultivars.
Significant differences in tolerance indices based on root growth variables, net root growth and total root length, were also detected among the same 30 B.napus cultivars grown in nutrient solution at p H 4.7 with Al (60μM) or without additional Al. There were also significant differences in Al uptake among cultivars. Al uptake tended to be greater in cultivars with lower tolerance indices for total root length. No close relationship was observed between the root growth tolerance indices in nutrient solution and tolerance indices measured in acid soil.
|Qualification||Doctor of Philosophy|
|Publication status||Unpublished - 1994|