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Thread: Gemmae sprouts

  1. #9

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    Tamlin:
    Thanks for clearing that up.

    Parasuco:
    Plants are not like other sexually reproducing organisms. Rather then producing a single cell that devides to form 2 sperm or 1 egg and a 'dead egg', they have alternating generations, I tend to get the two generations mixed up, but basically, one generation creates a cell with 1/2 the number of normal chromosomes, which then begins to go through normal cellular devition to form a small plant that contains a differnt number of chromosomes. Some of the little plants are male, others are female and both will make a final clone cell to be used as egg or sperm. They then meat up with each other to form the next generation of the plant. The generation which is longest lived depends on the group of plants. Anyways, I have trouble keeping it all strait(which names goes with wich and such) if someone who isn't dislexic could explain the concept to people, I would be very thankfull.
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  2. #10

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    This is reaching back a bit to my botany days, but here goes.

    Aquatic plants simply discharged their sperm into water where they eventually met up, and fertilization happened. With the loss the water habitat, landplants had to evolve a strategy. This led to sexual recombination of genetic material.

    Sexual reproduction requires 2 steps in plants. The first step in meiosis, where the number of chromosones are reduced by half through cell division, producing a spore. This is the gametophyte generation which is haploid. These cells divide by mitosis, and all the other cells derived from the mitosis are likewise haploid. In flowering plants, both male and female spores can be produced.

    Eventually, these cells unite in sexual reproduction, producing a diploid zygote, and this is the beginning of the sporophyte generation.

    In flowering plants, the haploid (gametophyte) generation is short lived. In ferns and mosses it occupies the majority of the plants life.
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  3. #11
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    Hey Darcie,
    About the VFT plantletts on flower scapes.... Adrian Slack briefly described in in is book, "Carnivorous Plants" (second edition). I don't have it in front of me, so I'm not going to mis-quote him, but I think he said it has something to do with a random "error" in flower production when conditions are not ideal. I'll have to re-visit the chapter and report back (if I remember....I don't think I'll have much brain function tonight and tomorrow [img]http://www.**********.com/iB_html/non-cgi/emoticons/wink.gif[/img] )
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  4. #12

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    Thank you very much for the gemmae. I have taken of photo of D. paleacea ssp. roseana and D. ericksoniae x pulchella. Each is just about 1/2 inch in diameter.




    Nick

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  5. #13

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    As plants have evolved the haploid generation has tended to become smaller and smaller. The pollen grain is actually the entire haploid male plant reduced to just a few cells.

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