Diallel analysis of genetic resistance to cronartium quercuum f sp fusiforme in slash pine pinus elliottii var elliottii

Griggs, M.M.; Walkinshaw, C.H.

Phytopathology 72(7): 816-818


ISSN/ISBN: 0031-949X
Accession: 005145497

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Selfed, intercrossed and wind-pollinated progenies of 5 slash pines of varying field resistance were inoculated with 3 collections of C. quercuum f. sp. fusiforme. Two collections were from individual galls while the 3rd was a composite from 10 galls. Differences among families and inocula occurred in percent galled seedlings 9 mo. after inoculation. In diallel analyses, general combining ability effects were significant while specific combining ability effects were not. Maternal effects were not apparent. Gall lengths were not significantly different among full-sib families or inoculum sources. The 2 most resistant parents apparently possess different kinds of resistance.