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CROP BREEDING & GENETICS

Predicted Genetic Gain and Inbreeding Depression with General Inbreeding Levels in Selection Candidates and Offspring

USDA ARS CICGRU, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011

^* Corresponding author (jode.edwards{at}ars.usda.gov).

Methods for predicting response to selection in noninbred populations for individuals and family-based selection methods have been very well developed. However, theory to predict improvement of inbred lines derived from a recombined population, as well the predicted change in inbreeding depression rate, has not been developed. Prediction equations for general levels of inbreeding in both selection candidates and recombined offspring of selected parents for intrapopulation selection methods were developed. All common methods of individual, half-sib, and self-progeny selection were predicted to change inbreeding depression rates in a population if the covariance parameters D₁ and D₂* were nonzero. However, the change in inbreeding depression rate was unaffected by additive genetic variance. It was further established that outbred selection in some maize (Zea mays L.) populations may be expected to increase inbreeding depression based on published estimates of the covariance parameter D₁.

This article has been cited by other articles:

				B. M. Wardyn, J. W. Edwards, and K. R. Lamkey Inbred-Progeny Selection Is Predicted to Be Inferior to Half-Sib Selection for Three Maize Populations Crop Sci., March 17, 2009; 49(2): 443 - 450. [Abstract] [Full Text] [PDF]