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• W1972848400 abstract "Most parents used in single‐cross maize ( Zea mays L.) hybrid seed production are highly inbred lines that have been developed through many generations of selfing and evaluation. Many times, lines with good combining ability are identified in the first few generations of inbreeding, but after additional generations of selfing they become less vigorous and too weak (Le., reduced seed yield and pollen production) to be economically used. One way to overcome the problem of severe inbreeding depression and reduced vigor is to use lines that have been only partly inbred and are maintained by random‐mating within lines (sib‐mating). The primary objective of this study was to compare original S 2 lines with their maintained S 2 ‐line counterparts to determine if the genetic integrity was maintained after several generations of sib‐mating. We evaluated the performance of 14 original S 2 maize lines and their progenies reproduced by sib‐mating for several generations There were 14 original S 2 lines, each S 2 line maintained by using 10 plants per generation for six generations, each S 2 line maintained by using 20 plants per generation for six generations, and four lines were maintained by using mild selection for five generations. The S 2 lines were evaluated in a randomized complete‐block design in four environments. Significant (P < 0.05) or highly significant (P < 0.01) differences were found among S 2 ‐line groups for all traits except kernel row number and ear length. When compared as groups, the S 2 lines maintained by using 10 and 20 plants yielded 3.66 and 3.63 Mg ha −1 , respectively, significantly less than did the original S 2 lines (3.83 Mg ha −1 ). Conversely, the S 2 lines maintained by using mild selection yielded the same as their original S 2 ‐line group. Individual comparisons between each original SI line and its maintained S 2 ‐line counterpart showed that significant changes in the maintained S 2 lines occurred in both the positive and negative directions for 50% of the traits. The S 2 lines maintained by using 10 plants per generation tended to be less stable than if they were maintained by using 20 plants when compared with their original S 2 ‐line counterparts. Also, data from electrophoretic assays showed results similar to those observed in field evaluation. It was concluded that the genetic integrity of the original S 2 lines was not maintained by using sample sizes of 10 or 20 plants for grain yield. The changes in the lines' performances were small, however, compared with changes that would have occurred if the lines had been further inbred by conventional pedigree methods." @default.
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• W1972848400 date "1988-11-01" @default.
• W1972848400 modified "2023-09-26" @default.
• W1972848400 title "Evaluation of S2 Maize Lines Reproduced for Several Generations by Random Mating within Lines. I. Comparisons between the Original and Maintained S 2 Lines" @default.
• W1972848400 doi "https://doi.org/10.2135/cropsci1988.0011183x002800060008x" @default.
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