The Inheritance of Resistance to Powdery Mildew in Interspecific Hybrids and Induced Amphiploids of Zinnia Elegans Jacq. and Z. Angustifolia HBK
Loading...
Date
1985
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Sterile interspecific hybrids and colchicine-induced amphiploids of Zinnia elegans JACQ. and Z. angustifolia HBK were examined to determine the mode of inheritance of resistance to Erysiphe cichoracearum DC ex MERAT. Fertility was restored through colchicine treatment of two sterile hybrids of species reciprocal parentage which differed in ray petal response to the pathogen. Derived amphiploids were subsequently intercrossed to overcome the lack of segregation for this trait due to genetic control of pairing upon chromosome doubling. Resistance to E. cichoracearum appears to be complexly inherited in both leaves and ray florets of sterile hybrids and induced amphiploids. Two major dominant genes have been implicated in conferring resistance in ray petal tissue of derived amphiploids. Data obtained from the F[ hybrid progeny of the intercrossed amphiploids indicate that this trait is not cytoplasmically inherited. It is speculated that the genes conferring resistance in the ray florets are acting independently from those controlling leaf resistance and that most, if not all, of the resistance genes are inherited from Z. angustifolia
Description
Keywords
Zinnia elegans, zinnia, Zinnia angustifolia, Erysiphe cichoracearum, powdery mildew, genetics and breeding, ornamental plants, disease resistance
Citation
Euphytica 34(1985) 483-487