Use of 32P, in aluminum sensibility tests with bean

Abstract

Four greenhouse experiments were conducted to study the possibility of using ³²P, in aluminum tolerance tests of bean (Phaseolus vulgaris L.) The cultivars were previously classified according to dry matter yield date by regression analysis as aluminum tolerant (C₂₀ - Mulatinho Paulista; C₂₆ - Ricobaio 1014; and C₃₃ - Roxo 750) and aluminum sensitive (C₁₇, - Jamapa; C₂₈ - Rio Tibagi; and C₃₄. Tambó). Chopped roots from plant grown in a complete nutrient solution during thirty days and submerged in another solution containing aluminum showed to be a reliable indicator of ³²P absorption efficiency to aluminum tolerant and sensitive cultivars. Rate of ³²P uptake was more in aluminum tolerant cultivars than sensitive ones. These results are showing that aluminum tolerant cultivars can absorb phophorus more efficiently than sensitive ones. External ionic concentration (NaH₂PO₄) increased ³²P absorption in presence of 48 ppm of aluminum.