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- W2084131446 abstract "Pollen‐tube growth and seed siring ability were measured in crosses between the Louisiana iris species Iris fulva and Iris hexagona and their F 1 and F 2 hybrids. Flowers of the parental species were pollinated with self, outcross intraspecific, and interspecific pollen. Pollen‐tube lengths were similar for all three pollen types in I. fulva, but in I. hexagona interspecific pollen tubes were longer than intraspecific pollen tubes. Pollen‐tube lengths also differed for F 1 and F 2 flowers pollinated with I. fulva, I. hexagona, and hybrid pollen. For both hybrid classes I. fulva pollen tubes were the shortest while pollen tubes from I. hexagona and hybrids grew the furthest. Mixtures of genetically marked pollen were used to assess the seed siring ability of intra‐ and interspecific pollen in the parental species by varying the proportion of each pollen type in a replacement series design. For both species, the observed proportions of hybrid seeds were lower than the expected based on the frequency of each pollen type in the mixtures across all treatments. Flowers of I. fulva produced less than 10% hybrid progeny even when 75% of the pollen applied to stigmas was derived from interspecific flowers. The frequency of hybrid seed formation was somewhat greater in I. hexagona, but was still significantly lower than expected across all mixture treatments. Seed set per fruit remained constant across the mixture treatments for both species, but in I. fulva fruit set decreased with an increase in the proportion of interspecific pollen. The data indicate that both pre‐ and postfertilization processes contribute to discrimination against hybrid seed formation." @default.
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- W2084131446 date "1994-09-01" @default.
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- W2084131446 title "Reproductive interactions between hybridizing irises: analyses of pollen‐tube growth and fertilization success" @default.
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- W2084131446 doi "https://doi.org/10.1002/j.1537-2197.1994.tb15611.x" @default.
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