Principles of Plant Breeding (2+1)

Features and origin of polyploids

Features


1. Have larger vegetative parts
2. Slower in growth and flowering.
3. Thick and large flower and fruits than diploids.
4. Reduced fertility due to irregulaer meiosis


Origin


1.Chromosome doubling in somatic tissues, unreduced gametes.
2. Production of adventitious buds.
3. Physical agents like heat, cold and x-ray
4. Regeneration in vitro
5. Colchicine tratment.