Inbred


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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

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The description and assessment of distance between inbred lines of maize: I.
Except for a few offspring that have resulted from recent crosses between the lineages, all Mexican wolves alive today are inbred to some extent.
The results have implications for the concept of increased risks of disease in small, inbred populations.
Although one-third (34 per cent) of the faculty members in the institutions under consideration were inbred, this condition is more likely to be found in the larger institutions with strong graduate schools which confer the Doctor's degree, as shown in a later section.
o] are the mean fitnesses of inbred and outcrossed progeny calculated from the eight maternal sibmeans of each crosstype, respectively (cf.
The mean genetic similarity distance among the inbred lines ranged between 0.
Higher proportion of inbred animals and smaller number of founder genomes equivalent were observed for all breeds, expect of PN.
However, Senkaya is also inbred to Mill Reef (damsire of Valanour and paternal grandsire of Senkaya's dam, the Darshaan mare Sendana), who was by Never Bend out of Milan Mill, by Princequillo.
One, Emma Bywood, 30, said: "My son came home and I had to explain to him what inbred meant.
The UEA team found that the reproductive success of females in populations that were not inbred was identical, whether mating with one or five males.
The results of regression analysis by stepwise method for grain yield showed that grain protein percent in inbred lines in two conditions and in hybrids in heat stress condition in model were input.
In the American oyster Crassostrea virginica, for example, poor larval survivorship and growth were found in inbred groups (Longwell & Stiles 1973).