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Cucurbit Genetics Cooperative Report 15: vii-xi (Introduction) 1992


Comments from the CGC Coordinating Committee

The Call for Papers for the 1993 Report (CGC Report No. 16) will be mailed in August 1992. Papers should be submitted to the respective Coordinating Committee members by 31 December 1992. The report will be published by June 1993. As always, we are eager to hear from CGC members regarding our current activities and the future direction of CGC.

  • Gary W. Elmstrom (melon)
  • Dennis T. Ray (watermelon)
  • Mark G. Hutton (other genera)
  • Todd C. Wehner (cucumber)
  • J. Brent Loy (Cucurbita spp.)
  • Timothy J. Ng, Chair

Comments from CGC Gene List Committee

Lists of known genes for the Cucurbitaceae have been published previously in Hortscience and in reports of the Cucurbit Genetics Cooperative. CGC is currently publishing complete lists of known genes for cucumber (Cucumis sativus), melon (Cucumis melo), watermelon (Citrullus lanatus), and Cucurbita spp. on a rotating basis.

It is hoped that scientists will consult these lists as well as the rules of gene nomenclature for the Cucurbitaceae before choosing a gene name and symbol. Thus, inadvertent duplication of gene names and symbols will be prevented. The rules of gene nomenclature were adopted in order to provide guidelines for the naming and symbolizing of genes previously reported and those which will be reported in the future. Scientists are urged to contact members of the Gene List Committee regarding questions in interpreting the nomenclature rules and in naming and symbolizing new genes.

  • Cucumber: Todd C. Wehner
  • Melon: Michael Pitrat
  • Watermelon: Warren R. Henderson
  • Cucurbita spp.: Mark G. Hutton and Richard W. Robinson
  • Other Genera: Richard W. Robinson

Comments from the CGC Gene Curators

CGC has appointed Curators for the four major cultivated groups: cucumber, melon, watermelon and Cucurbita spp. A back-up Curator for the "Other genera" category in needed; any one wishing to take on this responsibility should contact the Chair.

Curators are responsible for collecting, maintaining and distributing upon request stocks of the known marker genes. CGC members are requested to forward samples of currently held gene stocks to the respective Curator.

  • Cucumber: Todd C. Wehner and Jack E. Staub
  • Melon: J.D. McCreight and Michel Pitrat
  • Other genera: Richard W. Robinson
  • Watermelon: Gary W. Elmstrom, E. Glen Price and Billy B. Rhodes
  • Cucurbita spp.: Mark G. Hutton and Richard W. Robinson

15th Annual CGC Business Meeting

23 July 1991 - University Park, Pennsylvania USA

The 15th Annual Business Meeting of the Cucurbit Genetics Cooperative was held on Tuesday, 23 July 1991 in the Willard Buildingof the Pennsylvania State University in conjunction with the 88th Annual meeting of the American Society for Horticultural Science (ASHS). Approximately 22 members were in attendance.

Minutes from the 14th Annual Business Meeting (Tucson, AZ) were approved. Mention was made of (1) the upcoming U.S. cucurbit meetings in Colorado and Kentucky, and (2) the 5th Eucarpia Cucurbitaceae Symposium scheduled for Poland in 1992.

CGC membership figures, summary statistics for the first 14 CGC Reports, and the 1990 CGC Financial Statement were presented. CGC Report No. 14 (1991) had not yet been mailed by the time of the Business Meeting because of a printer's error. [Editor's note: CGC Report No. 14 was subsequently mailed on 31 July 1991.] The Call for Papers for CGC Report No. 15 (1992) was scheduled to be mailed 31 August 1991, with submissions due by 31 December 1991.

The concept of a "core collection" for cucumber was proposed by Jack Staub and Todd Wehner; selection of accessions for the collection would be based upon morphological and biochemical (e.g., isozyme) traits. Within the core collection would be a "sampler" unit for investigators requesting access to a small but diverse germplasm set. The question was raised as to the current genetic purity of cucurbit plant introductions in the U.S. collection. Mark Widrlechner commented that most of the cucurbit collections at the North Central Plant Introduction Station (Ames, IA) were now in relatively good shape with the notable exception of melon. However, he also cautioned that the formal establishment of a core collection might not be currently possible because of tight budgets.

Wehner and Staub also proposed the establishment of a database for cucurbit cultivars structured similarly to the ASHS Vegetable Cultivar List maintained by Ed Tigchelaar. Jim McCreight volunteered that this topic would be taken up by the Cucurbit Crops Advisory Committee at their September meeting.

Mike Havey proposed that combined meetings of the commodity-specific cucurbit groups be scheduled on a biennial or quadrennial basis. There was general agreement that this was a worthwhile endeavor, and efforts would be made to schedule several groups together in 1992.

US Cucurbit Crop Advisory Committee (CCAC) 1991-1992 Update

J.D. McCreight, USDA-ARS, Salinas, CA USA

On 4 November, 1990, CCAC met in Tucson, Arizona in conjunction with the American Society for Horticultural Science (ASHS). Entry of disease resistance data from cooperators into the U.S. Germplasm Resource Information (GRIN) was identified as the highest priority. These data must be submitted to and accepted by CCAC and must be accompanied by a description of methodologies and the rating scale. The curators will also evaluate and accept historical data, and data from for eight countries may also be evaluated and entered on a case-by-case basis.

The "Core Concept" and its applicability to the cucurbit collections was also discussed further; its purpose is to decrease the maintenance effort of germplasm collections without decreasing the diversity in the collection or in the evaluation of the collection. Elimination of duplicate accessions, i.e., the same variety or plant Introduction (PI) under different designations, in the National Seed Storage Laboratory (NSSL) was discussed. Accessions in the Regional Plant Introduction Stations (RPIL) should, however, be backed-up at NSSL. Seed stocks were received from the Seed Savers Exchange, IBPGR and Asgrow Seed Company. Disposition of the IVT (The Netherlands) and Vavilov Institute (Russia) collections were discussed.

Two proposals were recommended for funding in FY 1991: "Evaluation of the U.S. Plant Introduction Collection of Cucumber (Cucumis sativus L.) for Chilling Resistance" (T.C. Wehner and L. Smeets), and "Evaluation of the U.S. Plant Introduction Collection of Cucumis melo (melon) for Resistance to Alternaria cucumerina (Alternaria Leaf Blight)" (C.E. Thomas and E.L. Jourdain).

On 8 September, 1991, CCAC met in conjunction with the National Melon Research Group and Squash Breeders meetings in Rocky Ford, Colorado. The meetings were hosted by Hollar Seeds of Rocky Ford. A new computer system for GRIN was expected to be installed by Spring 1993 which will be faster, have more capacity, and include animal germplasm in accordance with the 1991 Farm Act. The "Core Concept" continues to receive attention for efficient germplasm storage and evaluation. The Alfalfa Crop Advisory Committee is the leading advocate/user/tester of the concept.

Confusion remained about the incorporation of commercial varieties and F1 hybrids in the National Plant Germplasm System (NPGS). Kathy Reitsma stated that only those varieties no longer available are included. Previously NPGS stated that all varieties would be included; Plant Variety Protection seems to confuse this issue. The De-Accession of Sub-Committee under Jon Watterson's direction is working on a procedure for determining which cultivars in NSSL are duplicates. CCAC proposed to the ASHS Genetics and Germplasm Working Group that seed samples be submitted to NSSL before final acceptance of HortScience cultivar/germplasm release notes.

Numerical scales for descriptors were not assigned in the CCAC Report. CCAC subcommittees should define classes this year; these need to be defined prior to entry of evaluation data. As GRIN conforms to IBPGR protocol, GRIN must conform to IBPGR scales for resistance traits where "1" is most resistant and "9" most susceptible. This conflicts with that used by many plant breeders who rate "1" most susceptible and "9" most resistant.

Many cucurbits have been increased via open-pollination. The Ames RPIS is trying to produce cage-increased seeds from original seeds, and strives for approximately 500 cages per year of melons. It was recommended that we attempt to obtain the IVT collection and contact the Vavilov Institute to exchange information and germplasm. Efforts to obtain germplasm from the People's Republic of China were encouraged.

Four germplasm evaluation proposals were received by CCAC for 1992 NPGS funding. Two were recommended for funding: (First Priority) "Evaluation of the U.S. Plant Introduction Collection of Melon (Cucumis melo) for Resistance to Gummy Stem Blight (Didymella bryonia Auersw.) Rehm" (M.A. Kyle and T.A. Zitter), and (Second Priority) "Evaluation of the U.S. Plant Introduction Collection of Squash (Cucurbita spp.) for resistance to Gummy Stem Blight (Didymella bryonia Auersw.) Rehm" (M.A. Kyle and T.A. Zitter). The two proposals not recommended for funding were: "Evaluation of Cucumis sp. Germplasm, for Resistance to Zucchini Yellow Mosaic Virus" (J.D. Norton and G.E. Boyhan) and "Evaluation of the Cucurbita Germplasm for Susceptibility to the Silverleaf Disorder" (J.K. Brown, D.T. Ray and L. Wessel-Beaver).

The 1992 CCAC meeting will be in Raleigh, North Carolina, in conjunction with the Cucurbit Conference scheduled for 20-24 September. Claude Thomas proposed for discussion at these meetings the idea of having Cucurbitaceae '94 (at a location other than charleston). This would be five years after the Charleston meeting (Cucurbitaceae '89) and mid-way between the EUCARPIA meetings which are held every four years (1988, 1992 and 1996).

1992 Cucurbit Conference

Raleigh, North Carolina

19-23 September, 1992

Group Dates Contact Person
Pickling Cucumber Improvement Committee 21-22 September 1992

Jonathan R. Schultheis
Dept. Horticultural Science
North Carolina St. University
Raleigh, NC 27695-7609 USA

National Cucumber Conference 20 September 1992

Michael J. Havey
Department of Horticulture
University of Wisconsin 'Madison, WI 53706

Cucurbit Crop Advisory Committee 23 September 1992

J.D. McCreight
USDA-AR, 1636 E. Alisal St.
Salinas, CA 93915 USA

National Melon Research Group 23 September 1992

J.D. McCreight
USDA-AR 1636 E. Alisal St.
Salinas, CA 93915 USA

Cucurbit Genetics Cooperative 21 September 1992

Timothy J. Ng
1122D Holzapfel Hall
College Park, MD 20742-5611 USA

Squash Breeders Group 23 September 1992

David Groff
Asgrow Seed Co., Rt. 1, Box 1907
Tifton, GA 31794 USA

Watermelon Research Group 22 September 1992

Gary W. Elmstrom
Univ. Fla., Centrl FL R&E Ctr.
5336 University Avenue
Leesburg, FL 34748 USA

One item for discussion at the 1992 Cucurbit Conference will be whether there should be a CUCURBITACEAE '94 conference. This would occur five years after the Charleston meeting (CUCURBITACEAE '89) and would be mid-way between the Eucarpia Cucurbitaceae Symposia, which are held every four years (e.g., 1988, 1992 and 1996).

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Page citation: Wehner, T.C., Cucurbit Genetics Cooperative;
Created by T.C. Wehner and T. Ng, 1 June 2005; design by C.T. Glenn;
send questions to T.C. Wehner; last revised on 15 December, 2009