Molecular dialogues between pollen and pistil: gamete fusion regulates sperm delivery
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منابع مشابه
Gamete Fusion Is Required to Block Multiple Pollen Tubes from Entering an Arabidopsis Ovule
In double fertilization, a reproductive system unique to flowering plants, two immotile sperm are delivered to an ovule by a pollen tube. One sperm fuses with the egg to generate a zygote, the other with the central cell to produce endosperm. A mechanism preventing multiple pollen tubes from entering an ovule would ensure that only two sperm are delivered to female gametes. We use live-cell ima...
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The first key point to the successful pollination and fertilization in plants is the pollen-pistil interaction, referring to the cellular and molecular levels, which mainly involve the haploid pollen and the diploid pistil. The process is defined as "siphonogamy", which starts from the capture of pollen by the epidermis of stigma and ends up with the fusion of sperm with egg. So far, the studie...
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Fertilization requires recognition, attachment, and membrane fusion between gametes. In metazoans, rapidly evolving surface proteins contribute to gamete recognition and adhesion. Flowering plants evolved a double fertilization process wherein two immotile sperm cells are delivered to female gametes by the pollen tube, guided by elaborate communications between male and female reproductive orga...
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Sexual reproduction in flowering plants is unique in multiple ways. Distinct multicellular gametophytes contain either a pair of immotile, haploid male gametes (sperm cells) or a pair of female gametes (haploid egg cell and homodiploid central cell). After pollination, the pollen tube, a cellular extension of the male gametophyte, transports both male gametes at its growing tip and delivers the...
متن کاملSexual Reproduction of Interior Spruce (pinaceae). I. Pollen Germination to Archegonial Maturation
Stages of normal sexual reproduction between pollen germination and egg maturation are described for interior spruce. These prezygotic stages were studied by light and electron microscopy in more detail than was possible in previous studies, and new observations have been made. Sperm (male gametes) formation and the organelles that accompany the sperm within the pollen tube are described. The p...
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تاریخ انتشار 2013