EFFECTS OF AMINO ACIDS AND SUBSTANCES FROM WHEAT ROOTS ON THE SOIL-BORNE PLANT PATHOGEN COCHLIOBOLUS SATIVUS

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Abstract
Preconditioning of different isolates of Cochliobolus sativus with specific amino acids was found to alter their growth and sporulation characteristics in culture and markedly reduce their virulence to wheat seedlings. Amino acid conditioning also affected the sensitivity of C. sativus conidia to soil fungistasis and evidence suggesting a differential stimulation of conidial germination by substances from the roots of wheat varieties that differ in degree of susceptibility to ‘common root rot’ was obtained. Preconditioning of different isolates of Cochliobolus sativus with specific amino acids was found to alter their growth and sporulation characteristics in culture and markedly reduce their virulence to wheat seedlings. Amino acid conditioning also affected the sensitivity of C. sativus conidia to soil fungistasis and evidence suggesting a differential stimulation of conidial germination by substances from the roots of wheat varieties that differ in degree of susceptibility to ‘common root rot’ was obtained. © Williams & Wilkins 1974. All Rights Reserved.

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