Pollen density on the stigma affects endogenous gibberellin metabolism, seed and fruit set, and fruit quality in Pyrus pyrifolia

  title={Pollen density on the stigma affects endogenous gibberellin metabolism, seed and fruit set, and fruit quality in Pyrus pyrifolia},
  author={Caixi Zhang and Naoya Tateishi and Kenji Tanabe},
  journal={Journal of Experimental Botany},
  pages={4291 - 4302}
To clarify the relationship between pollen density and gametophytic competition in Pyrus pyrifolia, gametophytic performance, gibberellin metabolism, fruit set, and fruit quality were investigated by modifying P. pyrifolia pollen grain number and density with Lycopodium spores. Higher levels of pollen density improved seed viability, fruit set, and fruit quality. Treatments with the highest pollen density showed a significantly increased fruit growth rate and larger fruit at harvest. High… 

Study of pollen germination in pome fruit tree of Rosaceae family in vitro

Results showed significant differences among cultivars and finally favorable cultivars/genotypes of each genus with high pollen germination percentage and tube growth were selected to application in the future breeding and orchard establishment programs.

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Results showed significant differences among cultivars and genotypes of each three studied species for pollen germination, tube growth and longevity characteristics.

Fruit Set in Avocado: Pollen Limitation, Pollen Load Size, and Selective Fruit Abortion

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An Analysis to Visualize Influence of Global Warming on Wheat Grain Quality with High Molecular Weight Glutenin Subunits at

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Vitality of pollen, in vitro pollen germination and pollen tube growth (pollen tube length and pollen tube growth rate) were investigated in Oblacinska sour cherry in order to determine the




  • R. Bertin
  • Biology, Medicine
    American journal of botany
  • 1990
Seeds from heavy pollinations emerged better than seeds from light pollinations, but did not differ in speed of germination or in the performance of seedlings up to 126 days, probably due to differing intensities of pollen tube competition.

Effects of varying pollen load on fruit set, seed set and seedling performance in apple and pear

The results indicate that gametophytic competition may occur in apple crosses, but that it is probably weaker in pear, and with respect to scab resistance and mildew attack, no differences among treatments were found.


Reduction in pollen concentration affected several aspects of early fruit development, but quantitative differences in the amount of pollen applied did not reduce the adverse effects of using diploid pollen, suggesting that such effects do not arise through direct action of the pollen on the maternal tissues.

Pollen viability and pollen tube attrition in cranberry (Vaccinium macrocarpon Aiton).

Gametophytic selection via pollen tube attrition in the style appears to explain the discrepancy between stigmatic pollen load and the count of mature seeds in a cranberry fruit.

Floral density, pollen limitation, and reproductive success in Trillium grandiflorum

The relationship between floral density and plant reproductive success is addressed using two experimental approaches: a pollen supplementation experiment in 12 populations of Trillium grandiflorum that naturally varied in floral density, and a transplant experiment in which floral density was manipulated in plots at four experimental sites.

Effects of Pollen-load Size on Sporophyte Competitive Ability in Two Epilobium Species

This study does not support the hypothesis that pollen competition fosters selection for faster-growing progeny, and instead tests for effects of pollen-tube competition on progeny performance in Epilobium septentrionale and E. canum.

Genetic dissection of pollen competitive ability in maize

The identification and chromosomal localization of the genes that mainly affect pollen fitness variability were carried out by RFLP analysis, applied to a recombinant inbred population that had been characterized for about 200 restriction loci.

Effects of pollen load size and composition on pollen donor performance in wild radish, Raphanus sativus (Brassicaceae).

A greenhouse experiment in which both pollen load size and composition were varied in wild radish, Raphanus sativus, and the paternity of seeds were examined, suggesting that differential performance of pollen donors can occur at pollen load sizes that are likely to occur in field populations.