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James J. Luby and Douglas V. Shaw

horticultural variety requires several characteristics valued by consumers and providing economic sustainability for suppliers, every plant breeder faces the challenge of simultaneously selecting for multiple traits. Any pair of traits under selection may be

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M. Joseph Stephens, Peter A. Alspach, Ron A. Beatson, Chris Winefield, and Emily J. Buck

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

population has been continually improved for multiple plant and fruit traits through recurrent selection. Typically, ≈100 controlled crosses have been made each year among ≈30 or more parental genotypes in the main breeding population with additional crosses

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Kevin M. Folta

). Today seed retention remains an important trait selected in breeding programs ( Konishi et al., 2006 ). On the other hand, a tendency to disperse seed is favored under strong natural selection, so nonshattering populations are almost certainly remnants

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Rakesh Kumar and Todd C. Wehner

2008. z Plant breeders often use 5% to 10% selection intensity in their breeding program, although it may be reduced to 20% or worse by simultaneous selection for multiple traits. However, it is possible to increase fruit yield, fruit count, and fruit

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Zachary Stansell, Thomas Björkman, Sandra Branham, David Couillard, and Mark W. Farnham

selection of low genotype-by-environment traits, such as yield ( Byth et al., 1969 ; Chandra et al., 2003 ) or on multiple yield-related trait selection ( Sharma and Duveiller, 2006 ). We are unaware of the use of a selection index in horticultural crops to

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Colleen Kennedy, Luis F. Osorio, Natalia A. Peres, and Vance M. Whitaker

for PM. Canopy density varies widely among strawberry cultivars and is a potentially correlated trait with PM resistance. Thus far, there are no reports on the genetic relationship between these two traits in strawberry. The selection of populations in

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Benjamin D. Toft, Mobashwer M. Alam, John D. Wilkie, and Bruce L. Topp

management techniques and trait selections for breeding to develop efficient high-density macadamia orchards. Materials and Methods Location and materials. Macadamia trees were sampled from a breeding trial planted in Nov. 2011 at Maroochy Research Facility

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Ruining Zhang, Hongxing Cao, Chengxu Sun, and Jerome Jeyakumar John Martin

correlation analysis of various morphological characteristics and fruit quality traits of coconuts can provide helpful information regarding the selection, cultivation, and production of coconut germplasm resources. Principal component analysis PCA can

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Seth D. Wannemuehler, James J. Luby, Chengyan Yue, David S. Bedford, R. Karina Gallardo, and Vicki A. McCracken

selection by detecting the alleles with the targeted trait early in the plant’s life. Early screening is especially valuable in perennial fruit crops where conventional breeding relies on observation of fruit qualities requiring multiple years of growth