|KELLY, J - MICHIGAN STATE UNIVERSITY
|UEBERSAX, M - MICHIGAN STATE UNIVERSITY
Submitted to: HortScience
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/1/2001
Publication Date: N/A
Interpretive Summary: The new germplasm lines, ARS-R93344, ARS-R93346, ARS-R93349 were submitted for registration by the Agricultural Research Service, U.S. Department of Agriculture. The new germplasm lines have a Type IIa, upright and short- vine growth habit that combine rigid upright plant structure and excellent lodging resistance with the seed size, shape, and pigmentation criteria of the small-red market class. In performance tests from 1993 to 1998 at locations in Michigan, North Dakota, and Washington, the mean yield of the three new germplasm lines was 88% of that for Rufus but 17% higher than Garnet, commercial small-red cultivars used as checks to make comparisons. ARS-R93344, ARS-R93346, ARS-R93349 mature uniformly in the field, have exceptional "dry down" characteristics and exhibit an appealing "straw- yellow" appearance at harvest. The new lines carry the Ibc-12 gene combination form of resistance to bean common mosaic virus. ARS-R93349 also ocarries the Ur-6 gene which confers resistance to several races of bean rust disease. Subjective evaluations of culinary quality indicated that the new germplasm lines were equivalent to Garnet but four points lower on a processing quality index score than Rufus. ARS-R93344, ARS-R93346, ARS- R93349 broaden the genetic base of small-red germplasm for upright plant architecture, short vine growth habit, excellent lodging resistance and canning quality, and good combining ability for seed traits. The expanded base in small-red germplasm resulting from the release of ARS-R93344, ARS- R93346, ARS-R93349 provide greater options for bean breeders, growers, and other industry stakeholders to improve the small-red market class and increase profits along the chain from seed to supermarket.
Technical Abstract: Germplasm lines ARS-R93344, ARS-R93346, ARS-R93349 were developed cooperatively by the Agricultural Research Service of the U.S. Department of Agriculture and Michigan State University and released in 2000. The new germplasm lines have the Type IIa, upright and short-vine growth habit, and combine these characteristics with the seed size, shape, and pigmentation to meet criteria established for the small-red market class. The new line have improved yield and a longer maturity than previously released Type IIa small-red germplasm. In performance tests (1993 to 1998) at locations in Michigan, North Dakota, and Washington, the mean yield of the three new germplasm lines was 88% of that for Rufus but was 17% higher than Garnet, check cultivars used to make comparisons. Plants of ARS-R93344, ARS-R93346, ARS-R93349 average about 50 cm in height and, compared to Rufus and Garnet, are remarkably upright in appearance and have excellent lodging resistance, ,and "dry down" at harvest. The wt per 100 seeds of ARS-R93344, ARS-R93346, ARS-R93349 averaged 35.3 g and was similar to Rufus (35.9 g) but heavier than Garnet (29.9 g). ARS-R93344, ARS-R93346, ARS-R93349 carry the Ibc-12 gene combination form of resistance to BCMV. ARS-R93349 also carries the Ur-6 gene which confers resistance to several races of bean rust disease. All three lines provide the dry bean industry with new genetic sources of upright small-red germplasm with acceptable processing quality; thus, expanding the germplasm base and providing greater options for breeders, growers, and other industry stakeholders. Bean breeders are provided advantages in using the new germplasm lines to improve the small-red market class because of these lines; exceptional combining ability for seed traits and the Type IIa growth habit.