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T.E. Thompson and J.F. Baker

Abbreviation: h 2 , heritability. 1 Research Geneticist. 2 Assistant Professor.

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Xuan Wu, Shuyin Liang, and David H. Byrne

its first flush and growth phase during the spring and early-summer months, but also during the second growth phase in mid- to late-summer and fall months. The broad-sense heritability of rose architectural traits has been estimated using a set of

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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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Zhuping Fan, Yike Gao, Ling Guo, Ying Cao, Rong Liu, and Qixiang Zhang

, 2000 ). Therefore, systematic scientific research is important to investigate trait inheritance in bearded iris. Heritability evaluation is one of the most fundamental steps in a breeding program to gain access to new genetic changes and to create new

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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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John R. Stommel, Mary J. Camp, Judith M. Dumm, Kathleen G. Haynes, Yaguang Luo, and Anne Marie Schoevaars

attributes are few. This may be attributed to the expertise and resources often required to conduct postharvest assessment of quality attributes. The current report evaluates the heritability of postharvest attributes that contribute to fresh-cut product

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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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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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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