Power 4.2

1. Power 4.2 is a synthetic variety with 200 parent plants that were selected sequentially for multifoliolate leaf expression and for resistance to Phytophthora root rot and Aphanomyces root rot (race 1). Parent plants were selected from crosses between selections from three-year old Minnesota and Wisconsin yield trials. Yield trial source varieties were derived from various populations that were developed by phenotypic recurrent selection for high relative feed value (using Near Infrared Reflectance Spectroscopy), and for resistance to one or more of the following pests: bacterial wilt, Fusarium Wilt, Verticillium wilt, Phytophthora root rot, Aphanomyces root rot 
(race 1), anthracnose (race 1), and Leptosphaerulina leafspot. Parentage of Power 4.2 traces to the following germplasm sources: Cyclone, Gold Plus, 512, DK 142, Nemesis, and miscellaneous Cal/West Seeds breeding populations. Approximate germplasm source contributions are as follows: M. falcata (8%), Ladak (6%), M. varia (26%), Turkistan (3%), Flemish (49%), and Chilean (8%).

2. Power 4.2 is adapted to the North Central and East Central areas of the U.S. and is intended for use in the North Central, East Central, and Great Plains areas of the U.S.  Power 4.2 has been tested in Wisconsin, Minnesota, Illinois, Michigan, and Pennsylvania.

3. Power 4.2 is a dormant variety with fall dormancy similar to FD class 4 check varieties. Flower color observed in the Syn. 2 generation is approximately 100% purple with a trace of variegated, white, cream, and yellow.

4. Power 4.2 has high resistance to bacterial wilt, Fusarium wilt, Phytophthora root rot, Aphanomyces root rot (race 1), and stem nematode with resistance to anthracnose (race 1), Verticillium wilt, pea aphid, spotted alfalfa aphid, and northern root knot nematode (Meloidogyne hapla.) Reaction to blue alfalfa aphid has not been adequately tested.

5. Seed increase of Power 4.2 is on a limited generation basis with one generation of breeder and two generations of the foundation and certified seed classes. Breeder (Syn. l), foundation (Syn. 2 or Syn. 3), and certified (Syn. 3 or Syn. 4) classes will be recognized. Production of Syn. 3 foundation seed requires consent of the breeder. Breeder seed was produced under cage isolation near Woodland, California in 1998. Sufficient foundation seed for the projected life of the variety will be maintained by Cal/West Seeds. Stands of foundation and certified seed fields are limited to 3 and 6 years, respectively.

6. Certified seed of Power 4.2 will be available in 2003.

7. No decision has been made regarding Plant Variety Protection.

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

9. Variety Name:   Power 4.2.

Experimental Designation: CW 84017, CW 83017

Date NA&MLVRB first accepted this variety: January 2003.

Date this amendment submitted: November 30, 2003.