Skip to main content
ARS Home » Research » Publications at this Location » Publication #94867
Title: REGISTRATION OF INSECT RESISTANT SOYBEAN GERMPLASM LINES 'HC95-24MB' AND 'HC95-15MB'

Author
item Cooper, Richard
item HAMMOND, R - OARDC

Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/6/1998
Publication Date: N/A
Citation: N/A

Interpretive Summary: When introducing pest resistance from an exotic unadapted, germplasm source into high yielding, adapted soybean varieties, often many undesirable traits, such as pod shattering, lodging, etc., are also introduced. Thus, it often takes several cycles of breeding to obtain pest resistance into high yielding soybean varieties. The two lines, HC95-24MB and HC95-15MB, are selections from the second cycles of breeding. One of the parents of these lines was the best insect resistant line from the first cycle of selection. The other parent was the high yielding and Phytophthora root rot resistant semidwarf variety, Hobbit 87. HC95-24MB-15MB are a significant improvement over the resistant parent HC63-123-9. They are earlier in maturity, higher yielding, resistant to Phytophthora root rot and superior in insect resistance. However, they were not equal in yield to the best varieties currently being grown. Thus, these lines were released as germplasm rather than varieties for farmers to grow. These two lines are a valuable source of insect resistance and will be made available to public and private soybean breeders for their use in developing high yielding, insect resistant soybean varieties.

Technical Abstract: Two insect resistant semidwarf (dt1e1) soybean HC95-24MB and HC95-15MB were jointly released by the USDA Agricultural Research Service in the Ohio Agr. Res. & Dev. Ctr. These lines are from the second cycle of selection for insect resistance and are from the cross HC83-123-9 x Hobbit 87. HC83-123-9 is an insect resistant semidwarf line from the cross of Pixie x PI1229.358. PI 229.358 is the original source of insect resistance and is a maturity Group VII line, susceptible to lodging and pod shattering. HC83-123-9 is a late Group IV line from the first cycle of selection with adaptation to the Midwest and with improved resistance to lodging and seed shattering. However, yields are significantly below currently grown cultivars. HC95-24MB is Grp III maturity and HC95-15MB Grp IV maturity. Both lines have improved agronomic characteristics compared to HC83-123-9. These include earlier maturity, higher yield potential, greater shattering resistance, resistance to multiple races of Phytophthora root rot (Rps1K gene) and greater insect resistance. Although significantly higher in yield than previously released insect resistant germplasm lines, these lines were not high enough in yield to justify their release as cultivars. These lines should be a valuable source of insect resistance to public and private soybean breeders for their use in the development of high yielding, insect resistant soybean cultivars.