BIOA02H3 Lecture Notes - Lecture 6: Elaiosome, Hitchhiking, Myrmecochory
5 Feb 2017
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Both angio and gymnosperms have mobile phases in life cycle (seed dispersal syndromes) Plants want their offspring to be further away from them b/c competition, sunlight, etc. Without seed dispersal adaptation, most seeds are depositied close to mother plants (results in parent/offspring competition for space) Mating between closesly related individals results in inbreeding depression. >> b/c plants are sessile, w/o adaption for seed dispersal, parents and offspring would always compete w/ each other. Explosive seed dispersal diy (ballistochory) (cid:862)external hitchhiking(cid:863) (exozoochory) (cid:862)internal hitchhiking(cid:863) (endozoochory) ant dispersal (myrmecochory) gravity (barochory) and secondary dispersal. Ballistic dispersal eg. jewelweed pods have slivers under tension touching the pod make it explode and the seeds are catapulted outwards (unzip curl flip twist) Wind dispersal eg. milkweed need good, strong wind to propel their pollen (wind dispersed) eg. dandelion small seeds, just fly, double branching allows them to fly have parachutes eg. winged maple.
