BIOB38H3 Lecture Notes - Lecture 2: Rachis, Wild Type, Abscission
Document Summary
Increase in seed size and number: reduction of seed dispersal, loss of dormancy, life cycle: biennial to annual, more compact growth habit, outcrossing to selfing/asexual reproduction. Natural selection: on cultivated plants and animals. Selection by humans: has purpose or goal, on all organisms, no purpose or goal. Domestication: slow and stepwise (wild domesticated: plants are fully wild, we clear fields and tend to plants (defend, water). Forgers use wild progenitors: wild plant food production, harvesting, then management of wild progenitors, cultivation with systematic tillage (digging, seeding), land clearage, and emergence of arable weed flora. Work with semi-domesticated plants but eventually turn domesticated: domesticated plants do worse in wild habitat than cultivated plants. Cultivation of domestic crops, reliance on cultivation, improved harvesting methods. Rise to dominance and fixation domestic- type dispersal: reduction of seed dispersal, no seed dispersal adaptations: most seeds deposit close to mother plant.
