GH 797
  1. GH 797 is a synthetic variety with 44 parent clones. Parent clones trace to 22 populations selected for resistance to the following pests: bacterial wilt, fusarium wilt, verticillium wilt, phytophthora root rot, anthracnose (race 1), and aphanomyces root rot (race 1 plus two additional isolates). Phenotypic recurrent selection was used. Final selections were made from two year-old space-plant nurseries near Marshfield and Livingston, WI based on vigor, leaf hopper yellowing resistance, leaf disease resistance, winter survival, fall dormancy reaction and leafiness.  Parentage traces ro Nordic (16%), Venture (14%), AP 8822 (12%), Dawn (12%), Trident II (7%), Genesis (7%), Garst 645 (5%), Clipper (5%), Dominator, Cutter, North Star, Stine 9227, AP 8730, AP 8740, AP 8831, AP 8841 and AP 8843 (2% each). Breeder seed (Syn 1) was produced on cuttings of the parental clones near Nampa, ID in 1991. An equal number of cuttings (approx. 40) of each parental clone was transplanted at random into an isolated field and harvested in bulk.  The % of the germplasm sources listed below contribute to the major genetic constitution of this variety.
M. falcata
  
Ladak
  
M. varia
  
Turkistan
  
Flemish
  
Chilean
                     
7
  
8
  
21
  
22
  
34
  
4
                     
Peruvian
  
Indian
  
African
  
Arabian
  
Unknown
    
                     
4
  
-
  
-
  
-
  
-
    
2. GH 797 appears to be adapted to and is intended for use in the North Central Region of the U.S.. It has been tested in Iowa, Illinois, Wisconsin and Idaho.

3. Fall dormancy of GH 797 is similar to Ranger. Flower color of Syn 2 generation is approximately 72% purple and 28% variegated with a trace of cream, white and yellow.

4. GH 797 has high resistance to bacterial wilt, fusarium wilt, verticillium wilt, anthracnose (race 1) and Phytophthora root rot (race 1 plus two additional isolated), resistance to aphanomyces root rot (race 1) and pea aphid, moderate resistance to stem nematode, low resistance to spotted alfalfa aphid and is susceptible to blue alfalfa aphid. It has not been tested for resistance to blue alfalfa aphid and root knot nematode.

5. Seed increase is limited to one generation each of breeder (syn 1), foundation (syn 2) and certified (syn 3) seed classes. Certified seed may be produced from either breeder or foundation classes. A 1,3 and 6-year stand life is permitted on fields producing breeder, foundation and certified classes, respectively. Foundation seed production is limited to the Pacific Northwest. Breeder seed was produced in 1991. ABI will maintain sufficient seed stocks for the projected life of the variety

6. Certified seed will be available in 1995.

7. Plant Variety Protection will not be applied for.

8. This information can be forwarded to the PVP office.

              9. Variety name: GH 797
 
            Experimental designations: ABI 9144

           Date NA&MLVRB first accepted this variety: January 1995

           Dates previous amendments were accepted:

           Date this amendment submitted: December 1998
 
 
 
 

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