Inbred


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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Inbred

 

the offspring of a cross-pollinating plant obtained as a result of repeated forced self-pollination. With repeated self-pollination the viability and yield of the offspring are decreased, while the homogeneity in respect to the genotype is increased. As a result of heterosis, hybrids from the crossbreeding of inbreds are substantially superior to the parent forms in vigor of development and seed yield. For this reason, inbreds are important in the production of hybrid seeds of corn, sugar beets, cucumbers, and other crops.

Varieties or hybrids serve as the initial material in the development of inbreds. Succeeding generations are culled until the necessary homogeneity is attained, usually in the sixth generation. In culling, special attention is paid to the combining ability of the inbred. Only inbreds that with cross-pollination produce high-yield hybrids are selected. Inbreds are used to obtain hybrids of various types—for example, simple and double hybrids between lines and between varieties and lines. The highest yields are obtained from hybrids between lines, which are widely used, for example, in corn production.

REFERENCE

Guliaev, G. V., and Iu. L. Guzhov. Selektsiia i semenovodstvo polevykh kul’tur. Moscow, 1972.

IU. L. GUZHOV

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
If not planting the NextGen varieties, Cardines said the normal production ranges from 5-7 tons both hybrid and inbred with the common practice of farmers on rice farm management.
Treatment Number of jars Number of jars Percentage of jars producing offspring producing offspring Crossbred 193 114 59% Inbred 44 27 61% Mixed 32 17 53% All 269 158 59% Treatment Percentage of jars Total number of clutches producing female offspring Crossbred 38% 446 Inbred 48% 96 Mixed 41% 60 All 40% 602 Table 2.
Philippine Rice Institute statistics show that these varieties can yield around 10 tons of rice production per hectare, compared to inbred varieties that only give six tons.
'Inbred performs just like the hybrid but its cost is only 15 percent of that of hybrid seeds,' she added.
Among thirty six inbred lines evaluated, nine resistant (disease score [less than or equal to] 2) and good per se performance inbred lines viz., DMIT 105, DMIT 106, DMIT 111, DMIT 113, DMIT 118, DMIT 121, DMIT 123, DMIT 124 and DMIT 125 were selected for the production of single crosses.
The famous woolly mammoth was devastatingly inbred before it went extinct, recent (http://www.ibtimes.com/how-evolution-killed-mammoths-4-cool-facts-about-woolly-mammoth-extinction-whether-we-2502006) research has shown, with the last of the population in the United States having weak stomachs, no sense of smell, translucent hair and (http://www.ibtimes.com/woolly-mammoths-had-osteoporosis-fossils-show-bone-diseases-common-extinction-2528142) osteoporosis.
The objectives of this study were to estimate the effects of inbreeding depression and the average genetic components of nine maize genotypes on their green corn potential with the aim of identifying promising genotypes for the extraction of inbred lines for the maize breeding program.
Average inbreeding coefficients and number of inbred animals in the herd Birth year Herd total % (1) Inbred animal No Average No Average Foundation 103 0.023 21.6 22 0.105 2003 809 0.008 36.7 297 0.022 2004 1,416 0.013 48.4 685 0.027 2005 1,670 0.025 80.0 1,336 0.032 2006 1,201 0.026 95.6 1,148 0.028 2007 646 0.005 26.5 171 0.020 Overall 5,845 0.018 63.7 3,659 0.029 (1) Represents the proportion of inbred animals from the population.
Our study showed that the population of El-Kala is endogamous while we were expecting to find an inbred population.
If the parents are not inbred, the variance of the Mendelian sampling term is one half of the genetic variance.
Total 766 (10 sires and 756 cows) animals (10.43%) were found inbred. The average inbreeding coefficient amongst inbred animals was 5.33%.
Dewhurst Stakes winner Parish Hall is out of a mare by Montjeu and thus inbred 3x3 to Sadler's Wells.