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

Heterosis-definition & Hybrid vigour

Heterosis-definition

Heterosis

• Heterosis is the superiority of F1 (first generation offspring from cross) in one or more characters over mid parental or even better parental value.

Hybrid vigour

• Another term used for heterosis is hybrid vigour.
  
• Shull (1914) used this term for the first time. Whadely (1994) opined that two terms namely heterosis and hybrid vigour are erroneously used in synonyms to each other.
  
• According to him heterosis refers to the developmental stimulation while ‘Hybrid vigour’denotes the manifest effect of heterosis.
  
• In short ‘Heterosis’ is the ‘influence’while hybrid vigour is its effect