Identification of new sources of resistance to angular leaf spot among Uganda common bean landraces

Simple item page
dc.contributor.authorDdamulira, G.
dc.contributor.authorMukankusi, C.
dc.contributor.authorOchwo-Ssemakula, M.
dc.contributor.authorEdema, R.
dc.contributor.authorSseruwagi, P.
dc.contributor.authorGepts, P.
dc.date.accessioned2022-05-26T19:02:57Z
dc.date.available2022-05-26T19:02:57Z
dc.date.issued2014
dc.description.abstractBreeding for resistance to Angular Leaf spot (ALS), a fungal disease caused by Pseudocercospora griseola (Sacc), is faced with a challenge of the existence of a few resistance sources that are exotic and not well adapted to environmental conditions in Uganda. In addition, P. griseola is a highly variable pathogen that co-evolves with its host, therefore necessitating the continuous identification of new and stronger sources of resistance. Identification of local bean landraces/adapted bean varieties with resistance to ALS would probably quicken the progress of development of resistant cultivars, and reduce yield losses. Seventy four landraces, four commercial varieties, and two controls were screened with four P. griseola pathotypes 1:6, 17:39, 21:39, and 61:63 to determine their ALS resistance levels. One landrace, U00297, showed consistent and strong resistance to the four pathotypes. The inheritance of resistance in U00297 was established from three individual populations derived from crosses with three susceptible cultivars, K132, K131, and Kanyebwa, commercially grown in Uganda. The allelic relationships between U00297 and two existing ALS resistance sources, AND277 and G5686 were tested. Segregation ratios of F2 populations revealed that U00297 resistance to pathotype 17:39 is conferred by a single dominant gene, while digenic epistatic gene interactions were suggested for resistance to other pathotypes. The general and specific combining abilities were significant for resistance revealing the importance of additive and dominant components in the inheritance of ALS resistance. As a resistant parent, U00297 was a good combiner for resistance to pathotype 17:39, and effective resistance source to pathotypes 17:39 and 61:63. The allelic test indicated that the dominant gene in U00297 is independent of resistance genes harboured by resistance sources AND277 and G5686. The information generated is useful to breeding programs targeting developing bean cultivars carrying novel ALS resistance based on genes derived from U00297.en_US
dc.identifier.citationDdamulira, G., Mukankusi, C. M., Ochwo-Ssemakula, M., Edema, R., Sseruwagi, P., & Gepts, P. L. (2014). Identification of new sources of resistance to angular leaf spot among Uganda common bean landraces. Canadian Journal of Plant Breeding.en_US
dc.identifier.urihttps://nru.uncst.go.ug/handle/123456789/3510
dc.language.isoenen_US
dc.publisherCanadian Journal of Plant Breedingen_US
dc.subjectPseodocercospora griseolaen_US
dc.subjectResistanceen_US
dc.subjectCombining abilityen_US
dc.subjectAllelismen_US
dc.titleIdentification of new sources of resistance to angular leaf spot among Uganda common bean landracesen_US
dc.typeArticleen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Identification of new sources of resistance to angular leaf spot among Uganda common.pdf
Size:
753.43 KB
Format:
Adobe Portable Document Format
Description:
Article
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Agricultural and Veterinary Sciences