Andean beans (Phaseolus vulgaris L.) with resistance to the angular leaf spot pathogen (Phaeoisariopsis griseola) in southern and eastern Africa |
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| Authors: | Vas D Aggarwal Marcial A Pastor-Corrales Rowland M Chirwa Robin A Buruchara |
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| Institution: | (1) Ex-CIAT Breeder and Consultant, 21 Burnhope Drive, Brampton, ON, Canada, L6X3R5;(2) Research Plant Pathologist, USDA-ARS, Vegetable Laboratory, Bldg. 010A, Rm. 240, 10300 Baltimore Av., Beltsville, MD, 20705-2350, U.S.A.;(3) CIAT Bean Breeder and Regional Coordinator, P.O. Box 158, Lilongwe, Malawi;(4) Plant Pathologist, CIAT, Kawanda Agriculture Research Institute, P.O. Box 6247, Kampala, Uganda |
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| Abstract: | Common beans (Phaseolus vulgaris) are separated into two distinct groups: Andean and Middle American. We identified CAL 143 as the first Andean bean with
resistance to angular leaf spot disease caused by Phaeoisariopsis griseola. Angular leaf spot is the most widespread and economically important bean disease in southern and eastern Africa, and it
is especially severe on the extensively grown Andean beans. Cal 143 was resistant in Malawi, South Africa, Tanzania, and Zambia,
but it was susceptible in Uganda. This was attributed to the presence of races of P. griseola in Uganda not present in the other countries. We identified two additional Andean bean lines, AND 277 and AND 279, with resistance
to angular leaf spot in Malawi. We also characterized the virulence diversity of 15 isolates of P. griseola from southern and eastern Africa into nine different races. Five of six isolates from Malawi and two of seven from Uganda,
obtained from large-seeded Andean beans, were characterized into four different races considered Andean. These were compatible
only or mostly with large-seeded Andean cultivars. The other eight isolates from Uganda, Malawi, and the Democratic Republic
of Congo, obtained from a small- or medium-seeded Middle American beans, were characterized into five different Middle American
races. These were compatible with Middle American and Andean cultivars. CAL 143 was resistant or intermediate under greenhouse
conditions to all but one of the same 15 isolates from southern and eastern Africa, but it was susceptible to an isolate from
Uganda obtained from a medium-seeded Middle American bean.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | angular leaf spot CAL 143 common bean disease resistance Phaeoisariopsis griseola Phaseolus vulgaris |
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