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

This Article Figures Only Full Text Free Full Text (PDF) Free 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 HighWire Citing Articles via Google Scholar Google Scholar Articles by Martin, S.K.St. Articles by Futi, X. Search for Related Content PubMed Articles by Martin, S.K.St. Articles by Futi, X. Agricola Articles by Martin, S.K.St. Articles by Futi, X.

CROP BREEDING, GENETICS & CYTOLOGY

Genetic Gain in Early Stages of a Soybean Breeding Program

^a Dep. of Horticulture and Crop Science, Ohio Agric. Res. and Dev. Ctr., The Ohio State Univ., Columbus, OH 43210-1086 USA
^b Dep. of Agronomy, Shenyang Agric. Univ., Shenyang 110161, People's Republic of China

stmartin+{at}osu.edu

Multistage testing of genotypes is an essential feature in plant breeding programs. Little research is available to help breeders test efficiently. Our objective was to determine the genetic gain obtained in selected stages of a soybean [Glycine max (L.) Merr.] breeding program and to determine ways to increase the overall gain, if possible. The mean selection differential and genetic gain and their regression coefficient were determined for tests at the F₃, F₄, and F₆ generations of the Ohio State University-Ohio Agricultural Research and Development Center breeding program during 1985 to 1997. Genetic gain for yield averaged -1.4% in the F₃ stage, 3.7% in the F₄, and 9.1% in the F₆ stage, where percentages are based on the mean of the common check genotypes. Overall changes in maturity were small at each stage. Improvements in lodging resistance occurred in the F₄ and F₆. Negative yield gains in the F₃ were attributed to use of unreplicated plots and to the necessary selection pressure for early maturity. Examination of the selection differentials for individual lines indicated that selection could be intensified in the F₄ and F₆ generations with little risk of discarding potentially superior cultivars. The conclusion that near equality of the selection intensity across stages would be beneficial for this breeding program confirms the theoretical recommendations reported in earlier research.

This article has been cited by other articles:

				S. K. St. Martin and I. O. Geraldi Comparison of Three Procedures for Early Generation Testing of Soybean Crop Sci., May 1, 2002; 42(3): 705 - 709. [Abstract] [Full Text] [PDF]