Pure Line

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Pure Line


the homogenous generations of repeatedly self-pollinating plants or self-fertilizing animals, in which most genes are homozygous. The term was introduced in 1903 by the Danish geneticist W. Johannsen, who proved by experimentation on legumes that pure lines exhibit analogous phenotypes under identical conditions.

Pure lines are obtained from a single ancestor and are maintained by self-pollinization and selection. Individuals in pure lines repeat over several generations the same genetically fixed traits. Pure lines are important in agriculture inasmuch as they are the main structural elements of plant varieties. Hybridization of two pure lines often results in heterosis in the first hybrid generation; certain hybrid varieties of corn are obtained in this way.

The term “pure line” is sometimes incorrectly applied to inbred lines, which are the progeny of animals or cross-pollinated plants obtained from a single pair of ancestors and maintained over a number of generations by constant crossing of related individuals and by selection. Such lines are almost always used in genetic research on higher organisms. For example, “pure line” laboratory mice are used to study carcinogenesis and cancer treatment.


References in periodicals archive ?
It is possible to visually perceive the discrepancy between pure line 10 and others, and this statement is confirmed by the Scott-Knott test (Table 2).
The Fourier transform of the complex Fourier series is a one-sided pure line spectrum at multiples of the gear rotation rate.
In the field, inbreeding depression was restricted to lines that showed poor pure strain performance, and these strains also showed poor general combining ability, whereas strains with good pure line performance showed out-breeding depression and good general combining ability.
The F4:5 line was selected in Keiser, AR, in 1998, and seeds were bulked as a pure line for subsequent yield trials.
It holds a pure line, and I'm glad there's somebody out there defining that point of view, but in terms of actually having power, making a difference.
acquired the Petal Fresh Pure line from Enormarel Inc.
This enables scientists to produce a genetically pure line and do it faster, says Rines.
Reproductive success was estimated as the proportion of wild type progeny when scarlet-eyed males competed with pure line males, with [F.
recently added gummies and extra strength versions to its Slimquick Pure line, as well as expanding the Phytogenix brand to include garcinia cambogia; omega 3, 6, 7, 9 with coconut oil; and other varieties.