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- W770465897 abstract "Analyses of rust spots per seedling and cankering percentages of 215 families of western white pine in British Columbia, inoculated under controlled conditions in variable numbers in 4 inoculation years, indicate that spot frequency per seedling is under genetic control. Family heritability estimates ranged from 18.2% to 86.6%, averaging 77.3% for the years for which adequate families for selection were screened using 2-year-old seedlings. Confidence limits ranged from -12% to +163%. Repeated seed collections from parent trees often showed similar needle-spot-frequency performance against rust following inoculation under artificial conditions. Correlation between low spots per seedling and low percentage of cankering in many families indicates that fairly simple screening can produce tangible reductions in rust susceptibility. Mean spots per seedling from all parent trees tested vs. the mean for stock from unselected parents indicates gain of about 24.5% in reduced spotting by phenotypic selection of rust-free seed parents. Seed collections from the selected candidates in situ should reduce mean spots per seedling by 52% vs. unselected parents; cloning the selected candidates into a seed orchard should double the gain to about 100 %. Gains by using open-pollination progeny from the selected candidates over seedlings from unselected candidates could reach about 27.5%." @default.
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- W770465897 date "1996-01-01" @default.
- W770465897 modified "2023-09-23" @default.
- W770465897 title "Heritability and Gain of Reduced Spotting vs. Blister Rust on Western White Pine in British Columbia, Canada" @default.
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