Premium
Recurrent Selection as a Method for Concentrating Genes for Resistance to Helminthosporium turcicum Leaf Blight in Corn 1
Author(s) -
Jenkins Merle T.,
Robert Alice L.,
Findley William R.
Publication year - 1954
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1954.00021962004600020010x
Subject(s) - blight , biology , selection (genetic algorithm) , resistance (ecology) , horticulture , library science , agronomy , computer science , artificial intelligence
THE selection of desirable genotypes from populations segregating for characters controlled by several genes, indiscrete in their expression, presents many difficulties. The desirable genotypes may be difficult to identify accurately. They also may occur in such low frequencies that the number of individuals required to provide a reasonable chance of. including them may be almost prohibitive. For example, if a character is controlled by 10 pairs of genes, an F2 population segregating for all genes would require 1,048,576 individuals to provide opportunity of including one individual of each genotype. Backcrossing the F.,̂ plants to one of the parents will reduce the number of genotypes expected in the following generation. If the recurrent parent contributes a majority of undesirable allels, however, the frequency of desirable genotypes will be reduced and selection problems increased.