Absorption and distribution of phosphorus in cotton plants resistent and susceptible to "wilding disease"

Abstract

In order to find out the effects of "wilding desease" on the absorption and distribution of phosphorus, cotton plants of the varieties IAC-12 (susceptible) and IAC - RM4 (susceptible) were cultivated in nutrient solution containing phosphorus, without phosphorus, incolulated or not by Fusarium Oxysporum f. vasinfactum. Soon as the plants presented disease symptoms they were transfered to nutrient solution containing 32P . The plants remained in the so ution during 48 hours. Determination of the phosphorus activity was carried out on the different parts of the plants. The presence of the fungus affected the distribution of phosphorus in both varities. The susceptible variety (IAC - RM4) affected by the desease showed a 45% reduction in the capacity of phosphorus absorption.