Abstract
A survey of Australian cherry orchards identified the cherry cultivars Sunburst, Summit, Merchant, Sam, Sylvia, Tieton, Kordia, Regina, Empress, Nordwunder and Ulster as having low fruit-set associated with poor pollination. Unique orchard sites across Australia where low fruit-set was not a problem for these cultivars were located, and pollen gene-flow-analysis conducted using 6-PGD, GOT, G6PD, GPI, IDH, FDP and SKDH isozyme markers. Pollenisers for the above-mentioned cultivars were determined and Stella was a polleniser for eight of them. Stella's predominance was linked to it reaching full bloom before the other cultivars; anther dehiscence occurs sometime after flowers open, as such newly opened flowers; the most-fertile stage was mainly exposed to Stella pollen. Sunburst a self-compatible cultivar showed no evidence of self-fertilisation. The majority of pollenisers were found to be within 20 m of the tree under examination. Isozyme profiles for 22 cultivars not previously analysed are also presented.
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Acknowledgements
Thanks to Mr. Peter Smith, Mr. Barrie Gaudion, Mr. Jeff Sibley and Mr. Simon Rouget for the use of their orchards and assistance in sampling leaves and fruit. Dr. Phillip Ainsley and Ms. Gwen Mayo for laboratory assistance. Funding for the project was supplied by Horticulture Australia and Cherry Growers of Australia.
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Communicated by H.F. Linskens
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Granger, A.R. Gene flow in cherry orchards. Theor Appl Genet 108, 497–500 (2004). https://doi.org/10.1007/s00122-003-1426-6
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DOI: https://doi.org/10.1007/s00122-003-1426-6