Station de Génétique et Amélioration des Plantes, INRA, BV 1540, 21034, Dijon Cedex, France
Abstract:
Genetic resistance to vesicular-arbuscular (VA) mycorrhiza formation has been obtained in spontaneous or chemically induced mutants of two mycorrhiza-forming species (Pisum sativum L. and Vicia faba L.). The eight mutants, termed myc−, are characterized by aborted infections limited to one or two host cells. Expression of the myc− character is associated with that of the nod− character in both legumes, and is likewise under recessive genetic control. Preliminary analysis of the genetic behaviour of the myc− mutants in diallel crosses has shown that at least three genes are involved in VA mycorrhiza infection.