HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by da Silva, W. J. Articles by Lonnquist, J. H. Search for Related Content PubMed Articles by da Silva, W. J. Articles by Lonnquist, J. H. Agricola Articles by da Silva, W. J. Articles by Lonnquist, J. H.

Genetic Variances in Populations Developed from Full-Sib and St Testcross Progeny Selection in an Open-Pollinated Variety of Maize¹

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 (S₁) syn-2 was developed by intercrossing S₁ 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 (S₁) 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 S₁ progeny and full-sib selection producing, apparently, different changes in magnitude of genetic variances

Key Words: selection effect • genetic variance change • estimation of genetic parameters • Zea mays L.

² Rockefeller Foundation Fellow and formerly C. Petrus Peterson Professor of Agronomy, University of Nebraska, Lincoln, 68503 (now Director del Internacional Programa de Mejoramiento de Maiz - CIMMYT, Mexico).

Received for publication September 5, 1967.