Effects of Toxic Levels of Aluminium on Seedling Parameters of Rice under Hydroponic Culture
2014
The presence of Al in the rhizosphere of rice in acid soil restricts root growth and significantly reduces crop productivity. In this study, the effects of Al (30, 60 and 90 µg/mL) on seedling root growth, number of primary roots per seedling, seedling shoot length, number of leaves per seedling, seedling fresh weight, and seedling dry weight were studied. Rice genotypes were classified into three different classes, namely, tolerant, moderately tolerant, and susceptible, based on root tolerance index. The method of hydroponic culture was modified, and elaborated in the text. Toxic levels of Al in nutrient solution significantly decreased seedling root growth, number of primary roots, seedling shoot length, number of leaves per seedling, seedling fresh weight, and seedling dry weight. Few genotypes showed longer root length at 30 µg/mL Al in nutrient solutions compared with the control. High levels of Al in nutrient solutions were highly toxic for rice seedlings. Based on root tolerance index, Radhunipagal, Gobindobhog, Badshabhog, Kalobhog, UBKVR-11, UBKVR-16, UBKVR-18, Khasha and IVT4007-B were classified as tolerant genotypes, and these genotypes may be used as donors for breeding of Al-toxicity tolerance.
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