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M. Courtney, M. Mcharo, D. La Bonte and W. Gruneberg

increased iron and zinc content as ascertained by broad-sense heritability estimates using a novel technique. Materials and Methods Plant material and experimental design. Field research was done at the Sweetpotato Research Center at Chase, LA

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Gabriele Gusmini and Todd C. Wehner

, 1988 ). Several methods of estimating heritability and predicting selection response are available. Primarily, these methods partition the total variance into genetic and environmental variances, and the genetic variance into additive and dominance

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Jennifer Johnson-Cicalese, James J. Polashock, Josh A. Honig, Jennifer Vaiciunas, Daniel L. Ward and Nicholi Vorsa

crosses with the ultimate goal of introgressing FRR into productive backgrounds. The objectives of this study were to: 1) determine heritability of field FRR from an array of crosses using midparent–offspring regression; 2) further genetically define the

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Dennis T. Ray, Maren Elizabeth Veatch-Blohm, Valerie Hunter Teetor and Bruce Walsh

characteristics with high heritabilities, indicating low environmental effects. Heritability estimates of the traits associated with rubber concentration and rubber yield have been variable. In a study by Dierig et al. (2001) , variance from measured traits of

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Austin L. Grimshaw, Yuanshuo Qu, William A. Meyer, Eric Watkins and Stacy A. Bonos

or traffic tolerance in any turfgrass species. Understanding the genetic and environmental effects on the phenotypic expression of a trait is useful to develop a breeding strategy to improve the trait. Heritability determines the amount of variability

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Paul G. Thompson, John C. Schneider and Boyett Graves

Narrow-sense heritabilities (h2) for sweetpotato weevil (Cylas formicarius elegantulus) resistance were estimated in 2 breeding populations. Population A included clones from US programs with previously reported moderate levels of weevil resistance. Population B included clones of US origin plusplant introductions from 14 countries. Parents and progenies were included in field evaluations with no wild weevils present. Weevils were cultured and applied to each plant. Population A was evaluated for 2 years and population B for 1. The GXE estimate for population A was also used for population B. Heritabilities were estimated by parent offspring regression and variance component analysis. Average h2 for percentage noninjured roots were 0.35 and 0.47 for population A and B, respectively. Intermating highest performing genotypes from both populations should increase h2 by increasing frequencies of resistance genes. A moderate rate of increase in resistance levels should result from selecting and intermating resistant genotypes.

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Dilip R. Panthee, Jonathan P. Kressin and Ann Piotrowski

detailed investigation on the molecular mechanism of heat tolerance in tomato. Heritability analysis is important to determine the appropriate method of genetic improvement. Heat stress tolerance was found to have low heritability ( Hanson et al., 2002

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Matthew D. Clark and Eric Watkins

crucial to the plant breeder in determining the potential application of the material such as for turf ( Wright et al., 1983 ). Genetic variation and heritability estimates help predict the response to selection for desired traits ( Dudley and Moll, 1969

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Sogo Nishio, Masahiko Yamada, Norio Takada, Hidenori Kato, Noriyuki Onoue, Yutaka Sawamura and Toshihiro Saito

associated with this trait are now being used in applied chestnut breeding programs ( Nishio et al., 2013 ). On the other hand, the inheritance of NHD and NW has been insufficiently studied. Kotobuki et al. (1984) reported the narrow-sense heritability of

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Jonathan M. Bokmeyer, Stacy A. Bonos and William A. Meyer

patch resistance must be determined. Plant breeders use heritability estimates to determine the influence of the environmental and genetic factors affecting the trait of interest and what selection procedure should be implemented to make improvements