EEB340 Lecture 13.docx

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10 Apr 2012
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Lecture 13: Land Plant Reproduction
Land Plant Reproduction
Types of Meiotic Life Cycles
Zygotic meiosis
Gametic meiosis
Sporic meiosis (alernation of generations)
Gametangia development
Sporangia development
- land plants have Alternation of Generations
- function of the sporophyte is to produce spores meiotic divisions
- function of the gametophyte is to produce gametes mitotic divisions
Gameotphyte
- gametangia: where gametes develop
o gives rise to gametes by mitotic divisions
o two types: antheridia which give rise to sperm and archegonia which give
rise to eggs
- retention of the egg on the gametophyte is in all land plants
- release of sperm into environment never retained, always released (individuals
or spores)
- zygote dependent on gametophyte for nutrients
o transfer cell walls food can move to sporophyte
Sporophyte
- sporangia: produce spores
- tapetum: inner-most layer of cells to develop
o provides nutrients for spore development
o where most sporopollenin synthesized for deposition on spore walls
o dead when spores mature
- middle layer_ undergo apoptosis so that gone by time the spores develop
o function not yet determined
- endothecium: outer most layer (epidermis), assists in spore disperal
- zygotic meiosis fungi, some algae
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