1. MBS 1141 is a synthetic
variety with 98 parent clones. Parent clones trace to 27 populations selected
for resistance to the following pests: bacterial wilt, Fusazium wilt, Verticillium
wilt, Phytophthora root rot, anthracnose and Aphanomyces. Phenotypic recurrent
selection was used. Final selections were made from 2-year-old space-plant
selection nurseries at MarsMeld and Livingston, Wisconsin, based on vigor,
leafhopper yellowing resistance, leaf disease resistance, winter injuly
and fall dormancy reaction.
Parentage traces to Exp AP
8734 (12%), Venture (11%), Genesis (100/.), Gust 645 (7%), Aggressor (6%),
Nordic, Exp AP 8730, Exp AP 8740, Cutter (5% each), Stine
9227 (4%), Exp AP 8822 (4%), Exp AP 8820, Exp AP 8821, Exp AP 8830, Exp
AP 8832 (3% each), Trident II, Exp AP 8635B, Exp AP 8834, Exp AP 8840 (2%
each), with 6% from numerous other sources. Approximate germplasm source
contributions are: Mjaka~a (8%), Ladak (8%), M. varia (200/,), TUrkistan
(15%), Flemish (3 1%), Chilean (8%), Peruvian (4%), and 6%
unknown.
2. MBS 1141 appears to be adapted to and is intended for use in the North Central U.S. It has been tested in Wisconsi. Iowa, Idaho and Michigan.
3. Fall dormancy of MBS 1141 is similar to Saranac. Flower color Syn 2 generation is approximately 76% purple and 24% variegated with a trace of cream, white and yellow.
4. MBS 1141 has high resistance to bacterial wilt, Fusarium wilt, Verticillium wilt, anthracnose (race 1), Phytophthora root rot and pea aphid; and resistance to Aphanomyces (race 1). Reaction to stem nematode, spotted alfalfa aphid, blue alfalfa aphid and root knot nematode has not been determined.
5. Seed increase is limited to one generation each of breeder, foundation and certified 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 (Syn 1), foundation (Syn 2) and certified (Syn 3) classes respectively. Foundation seed production is limited to the Pacific Northwest. Breeder seed was produced in 1990. ABI will maintain sufficient seed stocks for the projected life of the variety.
6. Certified seed will be available in 1993.
7. Plant Variety Protection will not be applied for.
8. This information can be forwarded to the PVP office.