The Geneva Apple Rootstock Breeding Program

2015 ◽  
pp. 379-424 ◽  
Author(s):  
Gennaro Fazio ◽  
Terence L. Robinson ◽  
Herb S. Aldwinckle
Keyword(s):  
Breeding Program ◽  
Apple Rootstock ◽  
Rootstock Breeding

The Geneva Apple Rootstock Breeding Program

2015 ◽  
pp. 379-424
Author(s):  
Gennaro Fazio ◽  
Terence L. Robinson ◽  
Herb S. Aldwinckle
Keyword(s):  
Breeding Program ◽  
Apple Rootstock ◽  
Rootstock Breeding

scholarly journals 051 The USDA-ARS/Cornell University Apple Rootstock Breeding and Evaluation Program

HortScience ◽  
1999 ◽  
Vol 34 (3) ◽  
pp. 450A-450
Author(s):  
William C. Johnson ◽  
Phil L. Forsline ◽  
Herb S. Aldwinckle ◽  
William C. Johnson ◽  
Phil L. Forsline ◽  
...  
Keyword(s):  
Information Source ◽  
Breeding Program ◽  
Biotic And Abiotic Stress ◽  
Apple Rootstock ◽  
Apple Rootstocks ◽  
Lodging Resistance ◽  
Soil Pathogens ◽  
Evaluation Program ◽  
The U.S ◽  
Rootstock Breeding

In 1998, the USDA-ARS and Cornell Univ. instituted a cooperative agreement that mobilized the resources for a jointly managed apple rootstock breeding and evaluation program. The program is a successor to the Cornell rootstock breeding program, formerly managed by Emeritus Professor of Horticultural Sciences James N. Cummins. The agreement broadens the scope of the program from a focus on regional concerns to address the constraints of all the U.S. apple production areas. In the future, the breeding program will continue to develop precocious and productive disease-resistant rootstock varieties with a range of vigor from fully dwarfing to near standard size, but there will be a renewed emphasis on nursery propagability, lodging resistance, tolerance to extreme temperatures, resistance to the soil pathogens of the sub-temperate regions of the U.S., and tolerance to apple replant disorder. The program draws on the expertise available at the Geneva campus through cooperation with plant pathologists, horticulturists, geneticists, biotechnologists, and the curator of the national apple germplasm repository. More than 1000 genotypes of apple rootstocks are currently under evaluation, and four fire blight- (Erwinia amylovora) resistant cultivars have been recently released from the program. As a service to U.S. apple producers, rootstock cultivars from other breeding programs will also be evaluated for productivity, size control, and tolerance to a range of biotic and abiotic stress events. The project will serve as an information source on all commercially available apple rootstock genotypes for nurseries and growers.

scholarly journals Dw2, a New Dwarfing Locus in Apple Rootstocks and Its Relationship to Induction of Early Bearing in Apple Scions

2014 ◽  
Vol 139 (2) ◽  
pp. 87-98 ◽  
Author(s):  
Gennaro Fazio ◽  
Yizhen Wan ◽  
Dariusz Kviklys ◽  
Leticia Romero ◽  
Richard Adams ◽  
...  
Keyword(s):  
Genetic Map ◽  
Production Systems ◽  
Breeding Population ◽  
Breeding Strategy ◽  
Nucleotide Polymorphisms ◽  
Apple Rootstock ◽  
Apple Rootstocks ◽  
Yield Data ◽  
Trait Locus ◽  
Rootstock Breeding

The ability of certain apple rootstocks to dwarf their scions has been known for centuries and their use revolutionized apple (Malus ×domestica) production systems. In this investigation, several apple rootstock breeding populations, planted in multiple replicated field and pot experiments, were used to ascertain the degree of dwarfing when grafted with multiple scions. A previous genetic map of a breeding population derived from parents ‘Ottawa 3’ (O.3) and ‘Robusta 5’ (R5) was used for quantitative trait locus (QTL) analysis of traits related to scion vigor suppression, induction of early bearing, and other tree size measurements on own-rooted and grafted trees. The analysis confirmed a previously reported QTL that imparts vigor control [Dw1, log of odds (LOD) = 7.2] on linkage group (LG) 5 and a new QTL named Dw2 (LOD = 6.4) on LG11 that has a similar effect on vigor. The data from this population were used to study the interaction of these two loci. To validate these findings, a new genetic map comprised of 1841 single-nucleotide polymorphisms was constructed from a cross of the dwarfing, precocious rootstocks ‘Geneva 935’ (G.935) and ‘Budagovsky 9’ (B.9), resulting in the confirmation and modeling of the effect of Dw1 and Dw2 on vigor control of apple scions. Flower density and fruit yield data allowed the identification of genetic factors Eb1 (LOD = 7.1) and Eb2 (LOD = 7.6) that cause early bearing of scions, roughly colocated with the dwarfing factors. The major QTL for mean number of fruit produced per tree colocated with Dw2 (LOD = 7.0) and a minor QTL was located on LG16 (LOD = 3.5). These findings will aid the development of a marker-assisted breeding strategy, and the discovery of additional sources for dwarfing and predictive modeling of new apple rootstocks in the Geneva® apple rootstock breeding program.

Application of a MITE Citrus apomixis marker in the Australian rootstock breeding program

2018 ◽  
pp. 1-6
Author(s):  
M.W. Smith ◽  
M. Webb ◽  
D.L. Gultzow ◽  
T.K. Newman ◽  
D. Innes ◽  
...  
Keyword(s):  
Breeding Program ◽  
Rootstock Breeding
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