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REGISTRATION OF GERMPLASM

Registration of Common Bacterial Blight Resistant Dry Bean Germplasm VAX 1, VAX 3, and VAX 4

^a Univ. of Idaho, 3793 North 3600 East, Kimberly, ID 83341
^b International Center for Tropical Agriculture (CIAT), A.A. 6713, Cali, Colombia
^c Department of Agronomy & Soils, Univ. of Puerto Rico, Mayagüez, PR 00681

Corresponding author (singh{at}kimberly.uidaho.edu)

Common bacterial blight (CBB) [caused by Xanthomonas campestris pv. phaseoli (Smith) Dye] resistant common bean (Phaseolus vulgaris L.) lines VAX 1, (Reg. no. GP-203, PI 613172), VAX 3 (Reg. no. GP-204, PI 613173), and VAX 4 (Reg. no. GP-205, PI 613174) were developed at the International Center for Tropical Agriculture (CIAT), Cali, Colombia. CBB, a seed-transmitted disease, is among the most widely distributed diseases of common bean. In a heavily infected crop, disease symptoms may be found on all aerial plant parts including leaves, stems, pods, and seeds, and yield losses may exceed 40%. Although low to moderate levels of CBB resistance occur in common and scarlet runner (P. coccineus L.) bean, the tepary bean (P. acutifolius A. Gray) possesses the highest level of resistance (Singh and Muñoz, 1999).

Dry bean line VAX 1 was developed from an interspecific population PVPA 9576 = A 769///A 775//ICA Pijao/G 40001. The cultivated tepary bean accession G 40001 possesses indeterminate prostrate Type III growth habit and small white seed. It is highly resistant to CBB in leaves and pods. Dry bean cultivar ICA Pijao has small (25 g 100 seed^-1) black seed, indeterminate upright Type II growth habit and I gene for bean common mosaic (BCM) resistance. It is tolerant to bean golden mosaic (caused by a geminivirus) and leafhopper (Empoasca kraemeri Ross & Moore), but is highly susceptible to CBB. Line A 775 possesses Type III growth habit, small cream-colored seed, and I gene for BCM resistance. A 775 is resistant to angular leaf spot [caused by Phaeoisariopsis griseola (Sacc.) Ferr.] and anthracnose [caused by Colletotrichum lindemuthianum (Sacc. & Magn.) Bri. & Cav.] and moderately tolerant to water stress and low soil fertility. Line A 769 possesses small cream striped seed, Type II growth habit, I gene for BCM resistance, and resistance to angular leaf spot and anthracnose. A 775 and A 769 are susceptible to CBB. ICA Pijao was crossed with G 40001. The F₁ hybrid was then crossed with A 775 followed by a cross with A 769. Embryo rescue was essential for each cross. The resulting progenies were subjected to three generations of inbreeding before systematic screening and selection for CBB resistance was initiated (Singh and Muñoz, 1999).

Dry bean line VAX 3 was derived from population BC 11222 = A 769///A 775//ICA Pijao/G 40001////XAN 309. A sister line (PVPA 9576-1) of VAX 1, highly resistant to CBB, was crossed with previously developed CBB resistant line XAN 309. VAX 4 was derived from population BC 11219 = A 769///A 775//ICA Pijao/G 40001////XAN 263 by crossing breeding line PVPA 9576-1 with CBB resistant line XAN 263. Both lines, XAN 263 and XAN 309, derive their CBB resistance from the tepary bean, and also possess small red seed, Type II growth habit, and I gene for BCM resistance. Intensive screening and selection for CBB resistance in both populations were carried out from the F₂, using the pedigree method. For details regarding materials and methods, readers should refer to Singh and Muñoz (1999).

VAX 1 is high yielding, widely adapted, and possesses indeterminate prostrate Type III growth habit. Breeding lines VAX 3 and VAX 4 have indeterminate upright Type II growth habit. All lines are small-seeded (<25 g 100 seed^-1) and seed color of VAX 1 is cream-striped, while VAX 3 is shiny red, and VAX 4 is cream. They possess the I gene for BCM resistance. VAX 1 is highly tolerant to low fertility soils, water stress, and Fusarium root rot [caused by Fusarium solani (Mart.) Sacc. f. sp. phaseoli (Burkholder) Snyder & Hans.] and is resistant to angular leaf spot and anthracnose. All three lines are of medium to late maturity, requiring more than 70 d in warm tropics and >90 d in temperate environments of North America. Small quantity of Breeder seed for experimental purposes may be obtained from the corresponding author.

NOTES

Published as Idaho Agricultural Experiment Station Journal Article no. 99743, Univ. of Idaho, College of Agriculture, Moscow, ID 83844. Registration by CSSA.

Accepted for publication June 30, 2000.

REFERENCES

• Singh, S.P., and C.G. Muñoz. 1999. Resistance to common bacterial blight among Phaseolus species and common bean improvement. Crop Sci. 39:80–89.[Abstract/Free Full Text]

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