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Júlia Halász, Andrzej Pedryc, Sezai Ercisli, Kadir Ugurtan Yilmaz, and Attila Hegedűs

the Corvinus University of Budapest, Department of Genetics and Plant Breeding, Szigetcsép, Hungary. Table 1. Name of apricot cultivars collected from different Turkish regions, as well as their ripening time, skin color, fruit firmness, size

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Xiaohong Wu, Duan Wang, Xuefeng Chen, Congwei Sun, Xiping Zhao, and Chenjuan Jing

market, very early-ripening apricots with high yield, good fruit quality, strong disease resistance, and wide adaptability can be obtained through cultivar improvement. Indeed, many programs have focused on the breeding of very early-ripening apricot

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José Egea, Manuel Rubio, José A. Campoy, Federico Dicenta, Encarna Ortega, María D. Nortes, Pedro Martínez-Gómez, Antonio Molina, Antonio Molina Jr, and David Ruiz

. Origin ‘Mirlo Blanco’, ‘Mirlo Anaranjado’, and ‘Mirlo Rojo’ resulted from a cross made in 2002 at Murcia, Spain, between the apricot cultivar Rojo Pasión (female parent), which was obtained from the CEBAS-CSIC breeding program ( Egea et al., 2004 ), and

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David Ruiz, Manuel Rubio, Pedro Martínez-Gómez, Jesús López-Alcolea, Federico Dicenta, Encarna Ortega, María Dolores Nortes, Antonio Molina, Antonio Molina Jr., and Jose Egea

processes for low chilling warmer areas. Origin ‘Cebasred’ resulted from a cross made in 2012 at CEBAS-CSIC of Murcia (Spain) between the apricot breeding line ‘1100-5-26’ (female parent), which was obtained from the CEBAS-CSIC breeding program, and the

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José Egea, Jose A. Campoy, Federico Dicenta, Lorenzo Burgos, Jose L. Patiño, and David Ruiz

Egea, J. Burgos, L. Martínez-Gómez, P. Dicenta, F. 1999 Apricot breeding for sharka resistance at CEBAS-CSIC, Murcia (Spain) Acta Hort. 488 153 157 Hough, L.F. Bailey, C.H. 1982 30 years of apricot breeding in New Jersey Acta Hort. 121 207 210 Kölber, M

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David M. Hunter and Martin F. Gadsby

Mature seedling trees of pear (Pyrus communis and interspecific hybrids), and fruiting trees of peach and nectarine (Prunus persica), apricot (Prunus armeniaca), and pear were relocated during the dormant season using tree spades. During the growing season immediately following, some signs of drought stress were noticed but all trees grew well enough that they could be used as a source of budwood for limited propagation purposes. When drip irrigation was supplied, supplemented by overhead irrigation as required, normal growth and production resumed within two growing seasons of the move. Some tree losses (less than 10% of trees moved) were reported from one site where the soil type was Fox sand with very poor water holding capacity. These tree losses were attributed to an inadequate water supply to the root ball, even though the site was irrigated. Our experience has demonstrated the feasibility of relocating relatively large trees, which can be beneficial for germplasm conservation in a tree fruit breeding program. However, it is probably not economically viable to relocate such trees for commercial production.

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Vance Baird

Prunus, which includes peach/nectarine, almond, apricot, cherry, and plum, is a large and economically important genus in the family Rosaceae. The size and long generation time of these tree crops have hampered improvement through classical breeding and long-term selection programs. With the advent of DNA-based molecular diagnostics, an exciting era in germplasm improvement has dawned. Efforts are underway, notably in the United States (e.g., California, Michigan, North Carolina, and South Carolina) and the European Community (e.g., England, France, Italy, and Spain), to apply the tools of molecular mapping and marker-assisted selection to this important genus. The objective of these projects is to develop molecular linkage maps of sufficient marker density to tag phenotypic trait loci of agronomic importance. These include traits controlled by single genes (e.g., flower color, compatibility, flesh color, pest resistance), as well as more-complex, quantitative traits (e.g., cold hardiness, tree architecture, sugar content). An immediate outcome of these mapping efforts has been the development of DNA “fingerprints,” allowing for the discrimination of cultivars—both scion and rootstock. The maps will be used by breeders and molecular biologists to monitor gene introgression from wild species into elite lines, for marker-assisted selection of desired trait combinations, and for map-based cloning of specific genes. The molecular markers used in these mapping projects include RFLPs, RAPDs, and microsatellites. Each has their appropriate applications and advantages depending upon the resources at hand and the project's specific goals.

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Murat Seker, Kenan Kaynas, Ahmet Yilmaz, and Uygar Us

In this study, we described some tree and fruit characteristics of a novel white nectarine type. The genetic diversity within this white nectarine population was investigated using six enzyme systems and its isozyme variation was also compared with common peach and nectarine cultivars. The results demonstrated that there was a significant variation within the white nectarine population in terms of plant and fruit characteristics probably due to the repropagation of the white nectarines using seedlings by growers. This variation was also verified by isozyme polymorphisms. Plants characteristics of white nectarines were similar to the trees of common peach or nectarine cultivars. However, the white nectarines produce less yield than the common peach or nectarine cultivars and they have small fruit with white-cream color and small flesh ratio making their fruit less attractive. We believe that the white nectarines have high market value and consumer acceptance because of its unique flavor which was confused with taste of either plums or apricots. So far, no standard white nectarine cultivar has been reported. This is the first report characterizing some plant and fruit characteristics of white nectarines which could be used for breeding of standard white nectarine cultivars with high yield and fruit characteristics while keeping its unique flavor. In addition, the white nectarines represent a novel source of germplasm for improvement of peaches and nectarines.

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Joseph A. Fiola, Robert Lengyen, and Harry J. Swartz

65 POSTER SESSION 7 Breeding/Fruits & Nuts

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Maria L. Badenes, Jose Martínez-Calvo, Helena Gómez, and Elena Zuriaga

‘Dama Taronja’ and ‘Dama Rosa’ are mid-early ripening apricot cultivars ( Prunus armeniaca L.) from the apricot breeding program at Instituto Valenciano de Investigaciones Agrarias (IVIA). They have optimal productivity, excellent fruit quality