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James D. Frantz, Jeffrey Gardner, Michael P. Hoffmann, and Molly M. Jahn

part by the Cornell University Vegetable Breeding Institute and USDA IFAFS Award No. 2001-52100-11347.

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James D. Frantz, Jeffrey Gardner, Michael P. Hoffmann, and Molly M. Jahn

Development Center for cotton aphid resistant germplasm. This study was funded in part by the Cornell University Vegetable Breeding Institute, a consortium of companies that support plant breeding research at Cornell, along with funding from USDA IFAFS Award

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J.R. Baggett and D. Kean

Inheritance of a twisted pod characteristic, in which bean pods develop with a twist that sometimes exceeds 360°, was studied in crosses between round-podded green bean cultivars. In crosses between `Oregon 91G' (normal) or `Oregon 54' (normal) and OSU 5256-1 (twisted), the F1 was normal. Segregation in F2 populations, tested over a 4-year period and including 4,995 plants, clearly fit a 3 normal: 1 twisted ratio. All plants of backcrosses of the F, to the normal parent were normal and backcrosses of the F1 to the twisted parent segregated 1 normal: 1 twisted. The ratios observed indicated that twisted pods are conditioned by a single recessive gene for which the symbol tw is proposed.

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Lauren Brzozowski, William L. Holdsworth, and Michael Mazourek

The Cornell University vegetable breeding program has developed cucumbers ( Cucumis sativus L.) resistant to a spectrum of diseases, including powdery mildew ( Cavatorta et al., 2012 ; Jahn et al., 2002 ) and viruses ( Munger, 1993 ). The program

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Mark W. Farnham and Michael A. Grusak

economic and quality traits. Vegetable breeding has always been a balancing act in which breeders have tried to combine attributes like host plant resistance to disease with yield and vegetable quality, all at the same time. Most improvements made in the

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Todd C. Wehner, Samuel F. Jenkins Jr., and Richard L. Lower

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Richard L. Lower, Todd C. Wehner, and Samuel F. Jenkins Jr.

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K. Kasimor, J.R. Baggett, and R.O. Hampton

Commercial pea (Pisum sativum L.) cultivars, plant introduction (PI) lines, and Oregon State Univ. (OSU) breeding lines were tested for resistance to pathotype P2 (lentil strain) and pathotype P1 (type strain) of pea seedborne mosaic virus (PSbMV) and to bean yellow mosaic virus (BYMV) to assess the relative proportion of resistant and susceptible pea genotypes. Of the 161 commercial cultivars tested, 117 (73%) were resistant and 44 were susceptible to PSbMV-P2. Of these PSbMV-P2-resistant cultivars, 115 were tested for resistance to BYMV and all were resistant. Of the 44 PSbMV-P2-susceptible cultivars, 43 were tested for BYMV susceptibility and all were infected except two, `Quincy' and `Avon', both of which were susceptible to a BYMV isolate in another laboratory. Of 138 commercial cultivars inoculated with PSbMV-P1, all were susceptible. All PI lines and OSU breeding lines that were resistant to PSbMV-P1 were resistant also to PSbMV-P2. The high percentage of commercial cultivars resistant to PSbMV-P2 was probably attributable to the close linkage of genes sbm-2 and mo and the widespread use by breeders of BYMV-resistant `Perfection' and `Dark Skin Perfection' in developing new pea cultivars. Segregation ratios in progenies of three separate crosses between PSbMV-P2-resistant and PSbMV-P2-susceptible cultivars closely fit the expected 3 susceptible: 1 resistant ratio expected for resistance conferred by a single recessive gene.

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R.G. Gardner