Lecture 16 - Unusual seed devel. & dissemination

Lecture 16 - Unusual seed devel. & dissemination -...

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UNUSUAL SEED DEVELOPMENT AND RIPENING/DISSEMINATIO N Lecture 17
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Unusual types  of seed  development
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Unusual types of seed  development      - development of asexual seeds      - embryo forms from a somatic         cell in the ovule      - fertilization is ________________      - daughter plant is a clone  Clonal seedling plants (“_____________”)  >400  apomictic species (40 families)  Most are ______________ apomicts  Citrus, mango, mangosteen  Make useful rootstocks ________________: 
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Grasses  Rosaceae family Two types of _____________  The 2N nucleus (corresponding to egg cell): -  does not undergo ________ -  is not fertilized -  takes egg cell position in sac -  divides to form an embryo unreduced (2n) egg cell* no fertilization* *Seed development differences with gametophytic  apomixis  Unusual types of seed  development __________________
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sexual  embryo asexual  embryo Citrus Mango ____________or adventitious  ____________ The egg cell (megaspore): - is reduced (to 1N) as it  undergoes meiosis  - is fertilized by the sperm - embryo forms normally - other cells in the embryo sac begin to divide - undergo _____________ (form additional embryos) Unusual types of seed  development
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____________:  Uses in horticulture  - - Produces juvenile, vigorous growth, with delayed fruit  production and thorns -    Produce virus-free understock (citrus, mango) *Apomixis and genetic engineering of cultivated crops Unusual types of seed  development
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Lecture 16 - Unusual seed devel. & dissemination -...

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