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John R. Stommel and Robert J. Griesbach

.0, whereas the most orange fruit had a value near 0.5. The leaf color data were transformed using the formula R + B-G. Using transformed data, the blackest leaves had a value near 60, whereas the greenest leaves had a value near 4. Heritability

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Roberto Hauagge and James N. Cummins

Abbreviations: CR, chilling requirement; CU, chill unit; GDH, growing degree hours; H 2 , heritability; I 50 , index of bud activity; OP, open-pollinated. 1 Present address: IAPAR-lnstituto Agronômico do Paraná, P.O. Box 2301, Curitiba, PR, Brazil

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Cecilia E. McGregor, Vickie Waters, Tripti Vashisth, and Hussein Abdel-Haleem

of inheritance, heritability, and the possible candidate genes are all unknown for this crop. These factors are critical impediments to efficient breeding of watermelon cultivars in a changing environment, and especially for the United States where

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J. Steven Brown, Raymond J. Schnell, Tomás Ayala-Silva, J. Michael Moore, Cecile L. Tondo, and Michael C. Winterstein

. Our analysis combined data from 2 later years, when the trees were more mature (2005 and 2007), for the calculation of heritability estimates for five color traits, fruit weight, fruit length, fruit width, and anthracnose resistance. No data were

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Christopher S. Cramer

Realized heritability estimates of bolting percentage, pink root and fusarium basal rot severities and incidences, and percentage of single-centered bulbs were estimated for half-sib families of an intermediate-day, open-pollinated onion (Allium cepa L.) population using selection response analysis. Half-sib families were selected based upon an index that equally weighted bolting percentage, pink root and fusarium basal rot severities and incidences, percentage of single-centered bulbs, and bulb quality. Families were subjected to one cycle of half-sib family recurrent selection. Pink root and fusarium basal rot severity was reduced by 17% and 7%, respectively, with realized heritability estimates of 1.28 and 0.65, respectively. More progress for pink root severity was made than was selected. Disease incidence was reduced by 18% and 12%, respectively, with heritability estimates of 0.65 and 0.60, respectively. Very little progress was made for the percentage of single-centered bulbs and this was reflected in a heritability estimate of 0.17. Selection based upon multiple characters at the same time may reduce the effectiveness of making improvements in a single trait. However even with low to moderate heritability, improvements were made, and suggest that further improvements can be made through selection.

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Yi Tan, Baisha Li, Yi Wang, Ting Wu, Zhenhai Han, and Xinzhong Zhang

heritability of BRR was estimated using the data from the 78 hybrid trees. Theoretically, the phenotypic value can be determined by the genotype and environment. Here, the phenotypic variance ( S ) was calculated as the hybrid population total variance. The

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Linda Wessel-Beaver and J.W. Scott

Abbreviations: G × E, genotype × environment; h 2 , heritability. 1 Professor. 2 Associate Professor. Florida Agricultural Experiment Station Journal Series no. R-02374. This research was supported in part by the U.S. Dept. of Agriculture under CSRS

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Verónica Raga, Guillermo P. Bernet, Emilio A. Carbonell, and Maria J. Asins

hybrids included in both treatments in all years ( InfoStat, 2004 ). Considering rootstocks as a random effects factor, broad-sense heritability (H 2 ) was estimated for all traits evaluated in 2008 only for nucellar rootstocks (repetitions) derived from

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Vance M. Whitaker, Luis F. Osorio, Tomas Hasing, and Salvador Gezan

( Whitaker et al., 2011 ). Although SSC and TA varied widely among genotypes, clear trends over time could not be observed for these traits. Until recently, there have been no published reports of genetic parameters such as heritabilities and genetic

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Dennis Ray, Steven Smith, and Mark Hurlburt

Lettuce (Lactuca Sativa L.) seeds imbibe water but most fail to germinate, This phenomenon now termed “thermodormancy” is prevalent in arid and semiarid climates like the southwest desert regions, Inheritance studies of thermodormancy were performed in two lettuce cultivars, Dabora (Dutch butterhead) and PI 251245 (a plant introduction from Egypt). Dabora will germinate up to 27 C and PI 251245 up to 36C. Reciprocal crosses were made. Pericarp color was used as a marker to determine successful crosses. Dabora X PI 251245 was used to estimate the heritability of thermodormancy by germinating seed from 10 F3 families and 160 F4 families at “high” temperatures.