The numerous methods by which outbreeding is maintained in the plant kingdom suggest that the resultant vigour and stored viability produced by heterozygosit is of great value to the species. There are many methods by which inbreeding is prevented and the consequent heterozygosity is ensured, both in a precise and an imprecise manner. One example is dichogamy, the plant showing either protandry or protogyny. This phenomenon applies to each flower on a plan t and does not prevent self-pollination , for one flower may easily be pollinated by another on the same plant . Outbreeding is also maintained by elaboration of the floral mechanism, thus reducing the chance of self-pollination , e.g. Orohidaoeae and Apooynaoeae. More precise methods of maintaining heterozygosity are by the phenomena of dioecism and incompatibility.
|Creators||Block, F. May|
|Source Sets||Ethos UK|
|Type||Electronic Thesis or Dissertation|
Page generated in 0.0025 seconds