Abstract
Standard white oat genotypes were subjected to different methods and aluminum (Al) levels under hydroponic conditions to verify the relationship between plantlet characteristics and their Al tolerance using multivariate analyses. A completely randomized design with three replications was used, adopting three evaluation protocols: “complete nutrient solution” with 0, 8, 16, and 32 mg L−1 of Al supplied as aluminum sulfate [Al2(SO4)3·18H2O]; “complete nutrient solution” with 0, 8, 16 and 32 mg L−1 of Al supplied as aluminum chloride (Al2Cl3•6H2O); and the “minimum nutrient solution” with 0, 1, 3, and 5 mg L−1 of Al supplied as Al2Cl3•6H2O. The performance of white oat plantlet genotypes subjected to excess Al in hydroponic conditions is greatly associated with root length, where the nutrient solution composition and the Al sources interfere in these associations. The study based on the joint analysis of characteristics at plantlet level does not allow an efficient discrimination of Al-tolerant and Al-sensitive white oat genotypes.
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