heterosis


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heterosis

 [het″er-o´sis]
the existence, in the first generation hybrid, of greater vigor than is shown by either parent.

het·er·o·sis

(het'ĕr-ō'sis),
The beneficial effect on the phenotype of crossing (hybridization) on growth, vigor, and physical or mental qualities in a strain of plants or in animal stock, as measured by the difference between the midparent mean phenotype and that of F1; also referred to as hybrid vigor.
[hetero- + -ōsis, condition]

heterosis

/het·er·o·sis/ (het″er-o´sis) the existence, in the first generation hybrid, of greater vigor than is shown by either parent strain.

heterosis

(hĕt′ə-rō′sĭs)
het′er·ot′ic (-rŏt′ĭk) adj.

heterosis

[het′ərō′sis]
Etymology: Gk, heteros + osis, condition
the superiority of first-generation hybrid plants and animals with respect to one or more traits when compared with either of the parent strains or with corresponding inbred strains. Also called hybrid vigor.

heterosis

or

hybrid vigour

the superiority of a HYBRID produced from crossing two different types of parent with one or more inferior characteristics. For example, two different inbred lines of cereals when crossed together can produce hybrids with a far higher yield and general vigour than either parental line.

heterosis

the existence, in the first generation hybrid, of greater vigor than is shown by either parent.
References in periodicals archive ?
1970) found that average percentages of heterosis for calving to first estrus, first breeding to conception, days open, and percent pregnant by 95, 120, and 145 days were not statistically significant.
Diallel analysis of combining ability and heterosis for yield and yield components in rice by using positive loci.
Alterations in inheritance pattern and level of cytosine DNA methylation, and their relationship with heterosis in rice.
Regarding heterosis (Table 1), among the evaluated hybrid populations, the observed values ranged from 24.
Days to 50% flowering, Dry pod yield per plant, Kernel yield per plant, 100 pod weight, 100 kernel weight and Sound mature kernels which indicated the presence of substantial amount of heterosis in cross combinations.
For the breeding guava program we have possibilities for the selection of new crosses, in order to exploit heterosis and allele diversity, the agronomic performance of genotypes should also be taken into account (number and weight of fruits and high quality traits).
They stated that if the heterosis is manifested by the parents with high x high, low x high and low x low general combining ability, it indicated the involvement of additive, additive genes with complementary effects, overdominant and epistasis gene interactions, respectively.
This situation may have occurred due to combination of remnant heterosis and transgressivesegregants in [F.
Prevalence of dominance effects triggers the breeder to proceed using heterosis breeding for improvement of traits whereas, in case of prevalence of additive effects argue to use simple selection and recurrent selection for improvement of traits in a population (Singh and Narayanam, 2011).