The aim of this work was to study morphological changes in the growth of Phaseolus vulgaris L. cv. Carioca when submitted to different levels of boron in a nutrient solution. Three treatments were applied in four completely randomized replications: T1 0.50 mg L-1 of boron (control); T2 0.25 mg L-1 of boron (intermediate level); T0 without boron. Samples were taken at three growth stages. Changes were evaluated through sections of root tips. Cellular division was inhibited when beans were grown in a solution without B. There was hypertrophy of the vascular cells and the plants died 55 days after emergence. At 0.25 mg L-1 B, there was a disorganization of root tip cells which was not severe enough to impair plant growth.
Phaseolus vulgaris; anatomy; mineral nutrition; root