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Agronomic qualities of genetic pyramids of common bean developed for multiple-disease-resistance

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Title Agronomic qualities of genetic pyramids of common bean developed for multiple-disease-resistance
 
Creator Okii, D.
Tukamuhabwe, Phineas
Tusiime, Geoffrey
Talwana, Herbert A.L.
Odong, T.
Mukankusi, Clare Mugisha
Male, A.
Amongi, Winnyfred
Sebuliba, Sulaiman
Paparu, P.
Nkalubo, Stanley T.
Ugen, Michael Adrogu
Buah, Saaka S.J.
Gepts, Paul L.
 
Subject backcrossing
phaseolos vulgaris l.
plant diseases
disease resistance
yield
electrophoresis
segregation
heritability
retrocruzamiento
enfermedades de las plantas
resistencia a la enfermedad
electroforesis
segregación
heredabilidad
 
Description Multiple co-infections by different pathogens on common bean (Phaseolus vulgaris L.) affect its productivity and cause complete crop loss in susceptible varieties. Therefore, gene pyramiding using marker assisted selection (MAS) and backcrossing, provide alternative cost-effective control measures to bean diseases. However, in the process of developing pyramids, linkage drags were likely to affect the qualities of progeny lines, hence, special attention was paid to this situation. The objective of this study was thus to assess the agronomic qualities of advanced genetic pyramids developed from a four-way cross for multiple disease resistance. The disease resistance genes (R) pyramided from four parents were: Co42 and Co-5 from G2333; Phg-2 from MEX54; Pythium ultimum Dennis from MLB49-89A and I & bc3 from MCM5001. The progeny lines were planted in an incomplete block design, and replicated thrice for two seasons (2015A and 2015B) in fields at CIAT, Kawanda in Uganda. Agronomic traits were highly heritable (0.6), except number of pods per plant (< 0.3). Backcrossing generated high-yielding bean lines, with 270 - 290 seed per plant and early maturity (95-100 days). Nine superior lines with desirable qualities, such as earliness (95 days), high seed rate (290 seeds per plant), and climbing ability, were obtained. Pyramiding R genes did not affect yield traits, except time to flowering and number of flower buds per plant due to transgressive segregation.
 
Date 2017
2017-11-30T20:40:41Z
2017-11-30T20:40:41Z
 
Type Journal Article
 
Identifier Okii, D.; Tukamuhabwa, P.; Tusiime, G.; Talwana, H.; Odong, T.; Mukankusi, Clare; Male, A.; Amongi, Winnyfred; Sebuliba, Sulaiman; Paparu, P.; Nkalubo, S.; Ugen, M.; Buah, S.; GEPTS, P.. 2017. Agronomic qualities of genetic pyramids of common bean developed for multiple-disease-resistance . African Crop Science Journal . African Crop Science Society, 25(4): 457-472.
1021-9730
https://hdl.handle.net/10568/89550
https://doi.org/10.4314/acsj.v25i4.5
 
Language en
 
Rights Open Access
 
Format 457-472
 
Publisher African Journals Online (AJOL)
 
Source African Crop Science Journal