Responses to Seven Methods of Recurrent Selection in the BS11 Maize Population

Responses to Seven Methods of Recurrent Selection in the BS11 Maize Population,10.2135/cropsci1998.0011183X003800020005x,Crop Science,Roger A. Weyhric

Responses to Seven Methods of Recurrent Selection in the BS11 Maize Population   (Citations: 9)
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methods include these three phases, they vary in types of progenies evaluated (i.e., inbred, full-sib, half-sib, Recurrent selection methods have been effectively used by maize etc.); number of progenies evaluated; number of se- (Zea mays L.) breeders to improve the performance of maize popula- tions for quantitatively inherited traits. Although theoretical compari- lected families (i.e., 5, 10, 20, 30, etc.); parental control; sons of such methods can be easily made, direct comparisons of the and the type of progenies intermated. It is this flexibility efficiencies of methods are time consuming and laborious. Because in the different types of methods and different parame- of these limitations, empirical data comparing multiple recurrent se- ters that has led to the utilization of a wide range of lection methods in the same base population are lacking for maize. recurrent selection methods for population improve- Our study was designed to compare the response to selection for ment with an equally wide range of responses. Even seven different methods (six intra- and one inter-population) in the with the diversity of recurrent selection methods, two BS11 maize population. A minimum of four cycles of selection were goals remain common throughout, increasing the mean conducted for each of the following methods: mass, modified ear-to- performance of the population and maintaining the ge- row, half-sib with inbred tester, full-sib, S1-progeny, S2-progeny, and netic variability in the population to facilitate long-term reciprocal full-sib selection. Selections for all programs except mass and reciprocal full-sib were based on an index composed of grain selection. The focus of our study was to improve the yield, grain moisture, stalk lodging, and root lodging. Each trait in mean performance of a single population with respect the selection index was weighted according to its heritability. The to four important agronomic traits via seven different populations per se, populations selfed, and testcrosses of the popula- recurrent selection methods. tions to the Cycle 0 population and to inbred B79 were evaluated in Grain yield has historically been the most important our study. Response to selection was measured for grain yield, grain trait and the trait most frequently used for selection moisture, stalk lodging, and root lodging along with other agronomic in maize population improvement. Recurrent selection traits. All selection methods were successful in significantly improving methods have not been widely adopted by maize breed- the population per se performance for grain yield. S2-progeny selection ers, although they have been effective for increasing
Journal: Crop Science - CROP SCI , vol. 38, no. 2, 1998
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