1. PGI 8633C is a 201 clone synthetic developed through phenotypic recurrent selection for reaction to blue alfalfa aphid and Phytophthora root rot. It was selected entirely from Mecca. The 201 plants were placed in a cage at Woodland, California where breeder seed (Syn 1) was produced in 1985 and 1986. Seed from both cages was bulked. Approximate germplasm source contributions are: African 46%, Indian 20%, Turkistan 10%, Chilean 9%, M. varia 2%, Peruvian 2%, M. falcata 1%, Ladak 1%, Flemish 1%, and Unknown 8%.
2. PGI 8633C is adapted and intended for use in the southwestern United States where highly non--dormant cultivars are grown. It has been evaluated for forage yield and persistence in California.
3. PGI 8633C is a very non-dormant cultivar with a dormancy similar 101. Flower color is 100% purple with traces of cream and variegated.
4. PGI 8633C has high resistance to Fusarium wilt and pea aphid; resistance to Phytophthora root rot and stem nematode; low resistance to bacterial wilt, anthracnose (Race 1) and Verticillium wilt. Reaction to spotted alfalfa aphid and blue alfalfa aphid has not been determined.
5. Sufficient breeder seed
(Syn 1) was produced to last the life of the variety. Seed classes will
be breeder (Syn 1) , foundation (Syn 2 or 3), and certified (Syn 2, 3 or
4). Foundation seed may be produced from breeder seed and a second generation
of foundation seed (Syn 3) may be produced at the breeder's discretion.
Certified seed may be produced
from either breeder (Syn
1) or foundation seed (Syn 2 or 3). Stand duration will be 2, 4 and 6 years
for breeder, foundation and certified seed fields respectively.
6. Certified seed will be available in 1992.
7. It has not yet been decided whether or not to apply for Plant Variety Protection.
8. This information may be forwarded to the PVP office.