About Lesson
Center of origin:
- It includes:
- China center of origin
- Hindustan center of origin
- Centra Asia of origin
- Asia minor center of origin
- Mediterranean center of origin
- Central American center of origin
- South American center of origin
- Abyssinian center of origin
Causes of shifting of center of origin
- Climate and other ecological conditions:
- Mountains, hills, Valleys
- Time:
- A shift in the area of the greatest cultivation
- Due to introduction of a concerned species
Creation of variation
- It can be done by both naturally as well as artificially
A) Naturally occurring variability:
- Domestication
- Germplasm collection
- Introduction
B) Artificially created variability:
- Hybridization: Inter varietal, intra varietal, distant.
- Mutations
- Polyploidy: Auto and Allopolyploidy
- Somaclonal variation
- Genetic engineering