Reproduction of Plants

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  • Reproduction in plants
    • flowering involves a change in gene expression in the shoot apex
      • vegetative phase - the young plant that comes out from a seed
        • change to the reproductive phase when flowers will appear
          • light is a main factor
          • temperature as well
    • the switch to flowering is a response to the lenght of light and dark periods in many plants
      • Pr absorbs red light of wavelenght 660 nm - Pfr
      • when Pfr absorbs far - red light, (730 nm) it is converted to Pr
      • in long - day plants have Pfr remain at the end of the short nights to bind to the receptor, which then promotes transcriptions of genes needed for flowering
      • in short -day plants the receptor inhibits the transcription of the genes needed for flowering when Pfr binds to it However, very little Pfr remains o the inhibition fails and the plant flowers
    • Most flowering plants use mutualistic relationship with pollinators in sexual reproduction
      • sexual reproduction - transfer of pollen from stamen to stigma
    • Success in plant reproduction depends on pollination, fertilisation and seed dispersal
      • fertilisation - male gametes into the style to the ovary

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