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Listing 1 - 6 from 6 for pollen grains

Passiflora pollen
... pollen Passiflora Online Passiflora pollen Pollen abnormalities | Passiflora pollen adhesion | Passiflora pollen adhesion cont. | Passiflora stigma pollen interaction | Passiflora self pollination Image © 2005 Paul R.A. West All Rights Reserved Passiflora 'Emil Kugler' anther with pollen. Passiflora pollen grains ... of Passiflora pollen SEM images. For information on storing pollen see Passiflora ...
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Passiflora pollen adhesion
... pollen and stigma does not rely on the outer pollen coating, but instead on the exine, a stable polymer made up of fatty acids and phenolics. Using pollen grains lacking a pollen coating due to genetic mutation, Preuss and Zinkl showed that these grains retained the ability to bind to same-species stigmas. "This indicates that the binding factors for the pollen ...
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Passiflora pollen adhesion cont.
... , ''As do all plants, Passiflora vines have the ability to distinguish their own pollen from pollen of other individual plants of the same species and from other species. This poorly ... receiving plant and the pollen and pollen tubes of the pollen-donor plant. Additionally, recent studies have shown the importance of the very first step in pollination, the first embrace. Pollen grains must first ...
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Passiflora stigma pollen interaction
... positions. ''In multiple donor pollinations, pollen load size is expected to increase pollen competition and affect the paternity of seeds produced. In Passiflora incarnata, the number of pollen grains received on the stigmatic ... 38.8 (s.d. = 38.0), and 385.7 (s.d. = 762.9) pollen grains, respectively. We found that pollen germination rates tend to be highest on hermaphroditic flowers (56.9%) and ...
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Passiflora self pollination
... often interferes with pollination. The pollen may be simply washed off the anthers or stigma. Also even if it isn't washed off water causes pollen grains to explode by sheer osmotic pressure, as observed in Passiflora incarnata by the Englishman, Mr. R. Badcock, Esq. in 1748. Nevertheless stigma cells initiate binding by water release to the pollen ...
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Pollen abnormalities
... Why is the pollen of hybrids often not fully fertile, with many malformed grains? Another question asked of botany students is, What mechanism could explain 50% pollen sterility in a ... as full-size apparently normal-looking grains that are actually dead inside. Measuring the percentage of non-living (= often distorted, malformed, or small) pollen to estimate meiotic incompatibility/ hybridization ...
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