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-producing desert plant ( Dierig et al., 1989 ; Ray et al., 1993 ; Thompson et al., 1988 ); consequently, selection for only one parameter may not always improve rubber yield. In guayule, single-plant selection for both root weight and rubber percentage increased

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Abstract

Thirty random seedlings from each of 50 random parents of a sweet potato (Ipomoea batatas (L.) Lam.) mass selected population were evaluated in the greenhouse and their subsequent field performances were recorded. Simulated selection sequences were also studied. A sequence with mass selection first on maternal hill weight, high seed set, and high seed weight followed by a 50% culling level within families on the basis of low greenhouse seedling vigor resulted in average progeny field yields 45% above that of no selection. The results showed seed weight to be a potentially useful selection criterion for root yield. Individual seedling root weight in the greenhouse was not a good predictor of field yield.

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for genetic gains using recurrent selection methodologies. However, these studies also suggest that heritability estimates are characteristic of individual populations and environments. Furthermore, genetic parameters may change over time as

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achieved by shortening the ear rather than actually lengthening the husk. The goals of this research were to determine the feasibility of selecting a sweet corn population for longer husks without shortening the ears, to determine whether direct selection

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recurrent selection at −0.8 MPa increased germination of sand bluestem ( Andropogon hallii ) nearly 2-fold in vitro ( Springer, 2011 ; Springer et al., 2014 ). In the field, establishment increased 16.4% compared with the base population ( Springer et al

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Turkey and the Caucasus. Most of the world's production is based on selections from local wild populations with different cultivars grown in each zone. Most cultivars are single clones, although some, including a few leading Turkish types (e.g., Tombul

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commercial traits are needed to be combined into one plant. The use of a selection index approach as described by Falconer and Mackay (1996) for such multiple-trait selection could offer a solution. This approach, designed to give the most rapid improvement

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Agricultural Research Service, nor criticism of similar ones not mentioned. We gratefully acknowledge the technical assistance of Rufus R. Horton, Jr., and the advice on recurrent selection methods of Robert H. Moll. The cost of publishing this paper was

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Breeders of horticultural crops and agronomic crops have often adopted different strategies and systems of selection. Breeders of grain crops have a long tradition of quantitative approaches and of collecting objective data from large populations

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cold tolerance in seashore paspalum through traditional breeding efforts as a result of insufficient genetic variability in cold tolerance or the lack of cold-tolerant cultivated germplasm ( Duncan and Carrow, 1999 ). Somaclonal selection is a powerful

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