GENETIC ANALYSIS OF RESISTANCE TO RACE 2F. OF PODOSPHAERA XANTHII IN WILD MELON MATERIAL ‘YUNTIAN-930’

‘Yuntian-930’ is a wild melon that is highly resistant to powdery mildew (PM). To determine the inheritance of resistance to powdery mildew (PM), ‘Yuntian-930’ was crossed with another cultivated melon, ‘Hualaishi’, which is susceptible to PM. Inheritance of resistance to Podosphaera xanthii race 2F. in six plant generations (P₁, P₂, F₁, B₁, B₂, and F₂) was studied using the mixed major-gene plus polygene inheritance mode with joint analysis method.
Inheritance of resistance in wild melons fitted the model of two pairs of additive-dominance-epitasis major genes plus additive-dominant-epitasis polygene.
The additive, dominant, and epistatic effects between the two major genes played an important role in inheritance.
The estimated values of heritability of major genes in B₁, B₂, and F₂ were 62.98, 58.58 and 90.89%, and those of polygene heritability were 28.93, 31.47 and 3.22%, respectively.
The ratios of the environmental variance to phenotype variance were 5.89-9.94%. Thus, resistance of ‘Yuntian-930’ to PM was controlled not just by two major genes, but was also affected by polygene and the environment.
The selection efficiency for a major gene of F₂ was highest in the resistance breeding program.

XXVIII International Horticultural Congress on Science and Horticulture for People (IHC2010): III International Symposium on Plant Genetic Resources

Xian Feng, Zhang Yong, Ma Jian-xiang, Zhang Xian, Yang Jian-qiang

wild melon ‘Yuntian-930’, powdery mildew (PM), resistance, Race 2F. of P. xanthii, inheritance

https://doi.org/10.17660/ActaHortic.2011.918.74