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Flowering and fertility changes in six generations of open pollinated sweetpotatoes
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The fertility of 6 successive generations of open pollinated sweetpotatoes was studied in each of 4 months. Breeding by open pollination increased the percentages of plants in flower, the number of flowers per plant, and total seed production. Both capsule and seed numbers per flower were higher in the first and last generations than in intervening generations. Self-compatibility, when determined by numbers of pollen tubes per stigma, was not affected by the breeding procedure. Mean numbers of pollen tubes per flower following cross pollination were higher in the later generations. Month to month effects were important in the case of all measurements. Flowering was most profuse in the middle of the season; seed set was highest early in the season; and pollen germination after selfing or crossing was highest at the beginning and end of the season. [AS]
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 Record created 1988-09-20, last modified 2019-01-22

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