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- W2000983631 abstract "Peanuts ( Arachis hypogaea L.) are potentially a genetically vulnerable crop in the United States because of their narrow genetic base. To broaden the base, breeders must identify exotic parents for inclusion in programs of hybridization and selection. Parental, F 1 , and/or F 2 performance could be used as indices to predict performance of inbred lines derived from crosses of adapted by exotic parents. Twenty‐seven exotics representing five South American centers of diversity, Africa, and China were testcrossed to an adapted Virginia (ssp. hypogaea var. hypogaea ) breeding line. The parents had been previously sorted into five morphological groups,. Parents, F 1 'S, and F 2 's were tested in 1979. Twenty F 2 families per cross were bulked in the F 4 and tested in 1981. Variation among bulks for pod and seed yield and other characters was due predominantly to differences among morphological groups. Exotics of ssp. hypogaea produced higher yielding bulks than those of ssp. fastigiata . Spanish (var. vulgaris Harz.) parents produced the hightest yielding fostigiata ‐derived bulks. Variation among bulks within morphological groups was significant for pod and seed size parameters and meat content, but not for yield. Performance of parents per se and F 2 's were the best indicators of F 4 bulk performance, based on product moment and rank correlations. F 1 performance, heterosis, inbreeding depression, and epistatic effects were largely unrelated to F 4 performance. It was proposed that exotics' performance per se could be used as a criterion for selection of parents for yield, although inclusion of F 2 yields in a multiple‐variable index was more accurate in predicting F 4 bulk means. Selection should be practiced within morphological groups of parents in order to retain parents from ssp. fastigiata ." @default.
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- W2000983631 date "1983-09-01" @default.
- W2000983631 modified "2023-09-26" @default.
- W2000983631 title "F 4 Bulk Testing in Testcrosses of 27 Exotic Peanut Cultivars 1" @default.
- W2000983631 doi "https://doi.org/10.2135/cropsci1983.0011183x002300050007x" @default.
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