Domestication of crop plants
Crop domestication represents a pivotal milestone in human history, marking the transition from nomadic hunter-gatherer societies to settled, agriculture-based civilizations, a period often referred to as the Neolithic Revolution. This transformation involved converting wild plant species into cultivated crops that could sustain larger human populations with more stable food supplies.
Crop domestication began independently about 8,000 to 10,000 years ago across multiple regions worldwide. Notable centers of domestication include:
| Region | Key Crops Domesticated |
| Fertile Crescent | Wheat, barley, lentil, chickpea |
| Mesoamerica | Maize (corn), chiles, squash, common bean |
| Andean Region | Potato, tomato, and a second center for common bean |
| Southeast Asia | Rice, millet, soybean |
A large number of the domestication traits are characterized by simple inheritance, i.e., they are controlled by one or two genes with large effects rather than by multiple genes. The simple inheritance of domestication traits would have aided their selection and incorporation into wild populations (Gepts, 2018). Domestication most likely occurred over an extended period of time, with ongoing cross-pollination between wild and domesticated populations. Because the selected plants represented just a small fraction of the total wild population, domestication was often accompanied by a reduction of genetic diversity.
process of Domestication
- Domestication is a slow evolutionary process influenced by human activity.
- It involves:
- Continuous selection of desirable traits
- Cross-pollination between wild and cultivated plants
- Gradual transformation from wild to cultivated forms
Factors operate in the selection process during domestication:
- The possible changes in plant species due to domestication
- Increase/improvement
- Adaptability size of fruits
- Size of seeds palatability
- Chemical composition
- Susceptibility to biotic stresses
- Yielding ability
- Reduction/loss
- Shattering
- Seed dormancy
- Seed viability
- Protective coverings Sturdiness
- Photoperiodic response
- Number of seeds
- Resistance to abiotic stresses
- Different/specific ecological preference
- Uniformly flowering and maturity
- Change from a perennial to annual habit
- Change in mode of pollination cross to self pollination
- Developing of seedless fruits
- Plant Genetic Resources One of the most outstanding Russian scientists of the twentieth century.
- An Agronomist Specialization in Plant Genetic Resources & Evolution.
- The vigorous, worldwide plant exploration program was planned for genetic resource management to fulfil the following objectives
- To collect and assemble all the useful germplasm of all the crops that had potential in the Soviet Union
- To study and classify the material
- To utilize it in a national plant breeding programme