The production of citrus in Brazil is limited by boron (B) supply, especially because of the low levels of this nutrient in the material of the soil. The importance of this element extends to the relationship of a positive aspect to the transport of potassium (K) through cell membranes. This interaction could be justified bythe effect that B exerts on the ATPase activity in the roots, which result in the observed differences in the nutritional status of citrus trees in the field, which still vary depending on rootstock varieties. Although B and K interaction is observed in studies on nutrient management for citrus, we do not have information that would prove this relationship. Based on the foregoing, the objective of this study is to evaluate the relationship between absorption of the B and Kby sweet orange and ATPase activity in the roots of the Swingle citrumelo and Sunki mandarin rootstocks. The project will be developed under screenhouse in pots with nutrient solution. The results of this study will assist in understanding the relationship B and K to the citrus-based information on the ATPase activity of the enzyme in the roots of two rootstock varieties contrasting for the supply of B.
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