BIOA02H3 Lecture : From Tree to Seed

• School: UTSC
• Department: Biological Sciences
• Course: BIOA02H3
• Professor: Mary Olaveson

Document Summary

Bioa02 module 1 lec 8: from tree to seed. Sage evolutionary transformation to accommodate for insect pollinators pastes pollen onto back of the bee. Third way that plants avoid being pollinated: self incompatibility biochemical reaction female can tell if the pollen is produced by the same individual (same genetic set-up) Self pollen female stops the fertilization by self-recognization. Can even hinder pollen to germinate (early incompatibility) Own pollen grain does start germinating (growing towards ovule) but cells somewhere in the style recognize own pollen and the pollen tube would be plugged to prevent it from growing (intermediate incompatibility) Pollen grain has reached all the way down to the ovule and is intersected there (late incompatibility) Self incompatibility occurs frequently in plant kingdom and found commonly in fruits we eat. Self incompatibility is often mixed with the other preventions. Some plants need vectors to exchange gametes therefore plants manipulate their environment to do this.