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Pleiotropic association of infection frequency and latent period of two barley cultivars partially resistant to barley leaf rust
Authors:J. E. Parlevliet
Affiliation:(1) Department of Plant Breeding (IvP), Agricultural University, Wageningen, the Netherlands
Abstract:Summary lsquoCebada Caparsquo, carrying four to six minor genes for a longer latent period (LP), was crossed to lsquoL94rsquo and lsquoVadarsquo, carrying no and five to six minor genes for a longer LP respectively. Of each of 68 F3-lines the infection frequency (IF) and the LP of ten lsquojust-headingrsquo plants were assessed. There appeared to be a strong association between IF and LP, whereby the relationship between IF and LP of both crosses could be described by a single linear regression equation. The data strongly suggest that the genes for increased LP pleiotropically decrease the IF. The possibility of a close linkage between genes for reduced IF and genes for increased LP, although unlikely, could not be excluded.
Keywords:Hordeum vulgare  barley  Puccinia hordei  barley leaf rust  infection frequency  latent period  linkage  minor genes  partial resistance  pleiotropy
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