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摘要
O presente trabalho teve o objetivo de analisar os efeitos do enxofre e da chuva 芍cida simulada sobre a estrutura foliar do feijoeiro (Phaseolus vulgaris L), nos aspectos morfoanat micos, teores de clorofila a, b, total e feofitina. As plantas-controle sofreram simula es de chuva com pH 6,0 e as plantas-teste sofreram simula o de chuva 芍cida com pH 3,0. As concentra es de clorofila a, b e total diminu赤ram no est芍dio de flora o (R6). J芍, no est芍dio R7, onde surgem as primeiras vagens, os teores aumentaram, indicando poss赤vel resist那ncia e/ou adapta o dos esp谷cimes 角s simula es 芍cidas. O tratamento 芍cido afetou a concentra o de clorofila que foi degradada por processos oxidativos sem a sua convers o em feofitina. Tamb谷m se observou diminui o na frequ那ncia de tricomas tectores e glandulares, assim como de est matos. As inj迆rias visualizadas foram classificadas como de car芍ter leve, provavelmente pela exist那ncia de anexos epid谷rmicos para prote o foliar e peciolar. The goal of this work was to evaluate the effects of sulfur and simulated acid rain on the leaf of Phaseolus vulgaris. Acid rain (pH 3.0) and an aqueous solution (Ph 6.0) were performed on test and control plants, respectively. A decrease in chlorophyll a, chlorophyll b and total chlorophyll concentrations was observed in theflowering stage (R6). However, increased rates were determined in the maturation stage (R7), which can suggest a resistance and/or adjustment of the plants to the acid simulation conditions. The acid treatment achieved chlorophyll degradation by oxidative processes without conversion to pheophytin. A reduction was also seen in the number of glandular and non-glandular trichomes and stomata on the test plants. Moreover, only small injuries were verified on the blade and peciolar areas of the tested individuals of P. vulgaris, probablydue to the presence of the reported epidermal structures.
