What is heterosis in plant breeding PDF?
Heterosis refers to the phenomenon that progeny of diverse varieties of a species or crosses between species exhibit greater biomass, speed of development, and fertility than both parents. Various models have been posited to explain heterosis, including dominance, overdominance, and pseudo-overdominance.
What is heterosis breeding in plant breeding?
heterosis, also called hybrid vigour, the increase in such characteristics as size, growth rate, fertility, and yield of a hybrid organism over those of its parents. Plant and animal breeders exploit heterosis by mating two different pure-bred lines that have certain desirable traits.
Why heterosis is useful in plant breeding?
Heterosis is a common biological phenomenon in nature. It substantially contributes to the biomass yield and grain yield of plants. Moreover, this phenomenon results in high economic returns in agricultural production.
What is heterosis and types?
Heterosis may be defined as the superiority of an F1, hybrid over both its parents in terms of yield or some other character. Heterosis, or hybrid vigour, describes the superior performance of heterozygous hybrid individuals compared with their homozygous parental inbred lines… Heterosis – Its Types and Theories.
What is heterosis with example?
Heterosis has been observed and, in some cases, harnessed in many diverse systems. Examples of interspecies crosses of mammals that produce heterotic phenotypes include the mule resulting from a cross between a male donkey and a female horse, and the liger resulting from a cross between a lion and a tiger.
What are different types of heterosis?
Types of heterosis
- Euheterosis or true heterosis.
- Mutational heterosis.
- Balanced heterosis.
- Pseudoheterosis or luxuriance.
Who discovered heterosis?
Corn (maize) Corn heterosis was famously demonstrated in the early 20th century by George H. Shull and Edward M. East after hybrid corn was invented by Dr. William James Beal of Michigan State University based on work begun in 1879 at the urging of Charles Darwin.
What are types of heterosis?
True heterosis (euheterosis) and pseudo-heterosis.