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25 sty 2023 · Flowering plants have evolved numerous intraspecific and interspecific prezygotic reproductive barriers to prevent production of unfavourable offspring1.
11 cze 2004 · In this review, we (1) survey recent discoveries of pollen and stigma functions both before and after they make contact, and (2) address the great diversity in pollen and stigma structures across taxa, focusing on how they accomplish key tasks in pollination.
28 cze 2008 · Siphonogamy, the delivery of nonmotile sperm to the egg via a pollen tube, was a key innovation that allowed flowering plants (angiosperms) to carry out sexual reproduction on land without the need for water. This process begins with a pollen grain (male gametophyte) alighting on and adhering to the stigma of a flower.
1 sty 2017 · Animal-pollinated plants display a multiplicity of structural adaptations that function to promote effective cross-pollen dispersal and reduce pollen wastage, especially on incompatible stigmas.
26 lip 2021 · During pollination in higher plants (angiosperms), the female stigma, comprising numerous stigmatic papilla cells, acts as the receptive surface for pollen grains (Figure 1 A). At this surface, major decisions are made regarding whether or not sexual reproduction is successful.
In this review, we (a) discuss the hypotheses proposed for the adap-tive value of TSS, (b) examine the phylogenetic dis-tribution of TSS in angiosperms, and (c) investigate associations between TSS and plant reproductive traits that we predicted to be relevant to the evolution of the phenomenon.
11 cze 2004 · Whether the pollen is transported by the wind or by animal pollinators, after landing on the stigma the pollen grain hydrates and germinates a tube. This tube then penetrates the specialized tissues of the pistil, growing into the stigma and the style to reach the ovules in the ovary.
