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Genetic Variances in Populations Developed from Full‐Sib and S 1 Testcross Progeny Selection in an Open‐Pollinated Variety of Maize 1
Author(s) -
Silva William J.,
Lonnquist J. H.
Publication year - 1968
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1968.0011183x000800020021x
Subject(s) - biology , selection (genetic algorithm) , open pollination , genetics , population , zea mays , botany , agronomy , pollination , demography , pollen , artificial intelligence , computer science , sociology
A nested Design I consisting of full‐sib and half‐sib families was used to study changes in genetic variances resulting from two selection systems in the ‘Krug’ yellow dent variety of maize ( Zea mays L.). Two populations derived from Krug on the basis of earlier Design I experiments were used. K (S 1 ) syn‐2 was developed by intercrossing S 1 progenies of the male parent of selected half‐sib families. The second population, K (FS) syn‐2 was developed by intercrossing remnant seed of selected full‐sib progenies. Both selected populations, K (FS) syn‐2 and K (S 1 ) syn‐2, were significantly higher yielding than the original variety, Krug. Design I matings were made within each of the two selected populations to provide evidence on changes in genetic variances that had occurred from the selection practiced. Selection resulted in a moderate decrease in genetic variance, with S 1 progeny and full‐sib selection producing, apparently, different changes in magnitude of genetic variances