Breeding of Vegetable, Spice and Tuber crops (2+1)

Types of Hybridization – Hybrid

Plant hybridization can be of two types.

• Intervarietal hybridization
• Distant hybridization

Intervarietal Hybridization

• In this type of hybridization, two parents from the same species (may be from two varieties, strains or races of the same species) are crossed.
• Single Cross Hybrids
• Double Cross Hybrids
• Three-way Cross Hybrids
• Triple Cross Hybrids
• Top Cross Hybrids

Single Cross Hybrids

• Results from the cross between two pure bred lines and produces an F1 generation called an F1 hybrid (F1is short for Filial meaning “first offspring).
• The cross between two different homozygous lines produces an F1 hybrid that is heterozygous; having two alleles, one contributed by each parent and typically one is dominant and the other recessive.
• The F1 generation is also homogeneous, producing offspring that are all similar to each other.

Double Cross Hybrids

• Result from the cross between two different F1 hybrids.

Three-way Cross Hybrids

• Result from the cross between one parent that is an F1 hybrid and the other is from an inbred line.

Triple Cross Hybrids

• Result from the crossing of two different three-way cross hybrids.

Top Cross Hybrids

• Cross between inbred line and OPV.

Distant Hybridization (Population hybrids)

• It includes
• Interspecific hybridization – crossing between parents from two different species