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Inheritance of bud-failure in almonds



Inheritance of bud-failure in almonds



Proc Amer Soc Hort Sci 77: 278-285



"Bud-failure" iis a nontransmissable, virus-like condition that occurs sporadically among trees of the Nonpareil and Peerless almond varieties and extensively in the Jordanolo variety. Reciprocal crosses were made between normal and bud-failure (bf) trees of Nonpareil and Peerless trees in all possible combinations. At the end of 6 years, qualitative and quantitative differences are shown among the populations depending upon parentage. Results obtained in populations of Texas x Jubilee bf, Nonpareil x Jordanolo and Nonpareil x Harriot are also given. It is hypothesized that bf is present as a recessive factor in Nonpareil and Peerless and gives rise to bud-failure trees by mutation. Jordanolo appears to be genotypically bf. Phenotypically symptoms of bud-failure may vary in expression from very slight (or none) to severe. The tree age at which symptoms appear may vary from 1 or 2 years to 20 years or more. This characteristic of bud-failure is interpreted to represent incomplete penetrance.

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Accession: 014082099

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