Crescimento do cafeeiro sob influencia do aluminio em solução nutritiva e em solo acido, inoculado com micorrizas arbusculares

AUTOR(ES)
DATA DE PUBLICAÇÃO

2003

RESUMO

Under greenhouse conditions, it was set up two experiments during the years 2000 and 2001, in order to study the toxicity of aluminum to coffee plants. In the first experiment the objective was to evaluate the differential response of eleven coffee cultivars to AI levels (O, 0.148, 0.296, and 0.592 mmol/L) in nutrient solutions study. In the second experiment the objective was to evaluate the behavior of two coffee cultivars - AI tolerant and AI susceptible, respectively - when grown on cerrado acid soil having three base saturation values, colonized by two arbuscular mycorriza or not colonized. The results from first experiment indicated that all the coffee cultivars tested were susceptible to AI due to limitations on photosynthesis, stomata and non-stomata gas exchange conductance. These caused reductions on the aerial plant part growth. The first visible symptom of the presence of AI in the root media was a reduction on the plant height. As the AI increases in the nutrient solutions it were observed increases on the AI, K, and Cu concentrations, and decreases on the P, Ca, Mg, Fe, Mn, and Zn. The lower level of AI (0.148 mmo/L) promoted an increase on the plant root growth of the all cultivars tested. From the Exp. 11 the results indicated that the two coffee cultivars tested did not showed the expected positive liming effect due to the FMAs inoculation. The mycorriza promoted better coffee growth probably due to the increases of mineral uptake and inducing better plant aerial part growth, higher leaf chlorophyll, and higher activities of the enzymes nitrate reductase and low activities of phosphatase. The cultivar susceptible to AI was more beneficiated by the mycorrization. This indicated that this cultivar is higher mycorrizal dependent. The arbuscular micorrhizas protected the plant from the AI action due to higher uptake of P and probably by an AI retention in the roots through linking on the fungus cells

ASSUNTO(S)

micorriza cafe aluminio

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