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Giuseppe Reforgiato Recupero, Giuseppe Russo, Santo Recupero, Roberto Zurru, Bruno Deidda, and Maurizio Mulas

As a result of its excellent agronomic qualities, sour orange continues to be used for citrus in the regions where citrus tristeza virus (CTV) is rare or absent. In Italy, sour orange was the most widely used rootstock until recently. However, the

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R.L. Rusholme Pilcher, J-M. Celton, S.E. Gardiner, and D.S. Tustin

Clonal rootstocks have been used in the propagation and cultivation of domestic apple for more than a century. These rootstocks have been selected for a range of desirable characteristics such as pest and disease resistance, cold hardiness, good

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Desire Djidonou, Amarat H. Simonne, Karen E. Koch, Jeffrey K. Brecht, and Xin Zhao

-resistant and interspecific tomato hybrid rootstocks have also been developed ( King et al., 2010 ). Moreover, vegetable grafting has been used successfully to minimize the deleterious effects of a wide range of abiotic stresses related to salinity ( Colla et al

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Thomas G. Beckman, Philip A. Rollins, James Pitts, Dario J. Chavez, and Jose X. Chaparro

After the release of Guardian ® in 1993 ( Okie et al., 1994a ), the USDA-ARS peach rootstock breeding program at Byron, GA, shifted its emphasis to combining resistance to PTSL, ARR, and several species of root-knot nematodes into a single

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Francisco Doñas-Uclés, Diego Pérez-Madrid, Celia Amate-Llobregat, Enrique M. Rodríguez-García, and Francisco Camacho-Ferre

has obtained good results in Spain ( Bello et al., 2001 ; Guerrero et al., 2005 ; Lacasa et al., 2000 ), biosolarisation and grafting onto resistant rootstocks ( Lacasa et al., 2004 ; Piedra Buena et al., 2006 ), which have proved effective when

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Ralph Scorza and Margaret Pooler

Doubled haploid peach [Prunus persica (L.) Batsch] lines were cross-pollinated to produce F1 hybrids. F1 hybrids were evaluated at 3, 7, 8, and 9 years after field planting for tree growth as measured by trunk cross-sectional area, and for fruit production as measured by total weight, total number, and production per unit trunk cross-sectional area. Fruit quality of most F1 hybrids was within the range of quality observed in progeny of standard peach cultivars, and tree growth and productivity were similar to those of standard cultivars. F1 hybrids present the possibility of developing scion varieties that can be produced from seed, thus eliminating the need for grafting scions onto rootstocks in situations where specific, adapted rootstocks are not necessary. They could also be used to develop genetically uniform seed-propagated rootstocks. The use of doubled haploid-derived F1 peach hybrids, however, would require reliable, efficient production techniques.

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Haishan An, Feixiong Luo, Ting Wu, Yi Wang, Xuefeng Xu, Xinzhong Zhang, and Zhenhai Han

depth) impact the reproductive and vegetative growth of apple trees ( Yao et al., 2006 ). Detailed knowledge about fine root production, mortality, and spatial distribution of dwarfing rootstocks is currently insufficient to understand the dwarfing

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Genhua Niu and Denise S. Rodriguez

al., 1998 ; Wahome et al., 2001 ) indicates that like other crops, salinity tolerance of rose plants depends on species, rootstock selection, substrate or soil type, and environmental conditions. However, little research has been conducted on garden

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Genhua Niu and Denise S. Rodriguez

Rose is one of the most common garden plants in the world. Due to its long history of cultivation and popularity, vast information exists on breeding, disease/pest management, culture and propagation, rootstock selection, and postharvest handling

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Elzbieta Z. Krzesinska and Anita Nina Miller Azarenko

providing the rootstock material and to Viki Freeman for her technical assistance. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement