Responses to selection for yield traits and key diseases among common bean genetic pyramids across locations
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Date
2019
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Crop Improvement
Abstract
Knowledge of response to selection (R) helps to analyze the
efficiency of crop-improvement programs and devise appropriate
selection strategies. The objective of this study was to determine
response to selection of common bean (Phaseolus vulgaris L.)
genetic pyramids for diseases and yield traits. Populations evaluated
included pyramided parents, climbing pyramided progenies,
and checks. The trial was planted in 2016 in Uganda (Kabale
and Kawanda) and Northern-Tanzania (Maruku and Kitengule) in
randomized incomplete blocks with three replications.
Summarized data and appropriate parameters were incorporated
into the breeder’s equation (R = ih2S). R was positive for mean
days to flowering (5 days) and negative for mean number of pods
per plant (−9.5 pods) and 100-seed weight (−1.9 g). Diseases
(anthracnose, angular leaf spot, and bean common mosaic
virus) had positive, undesirable R. Generally, pyramided lines
segregated at BC3F9 for disease resistance and yield traits, and
thus, superior bean lines should be identified in subsequent
generations, such as BC3F11.
Description
Keywords
Breeder’s equation, Crop-improvement, Gene pyramiding, Genetic variation, Selection
Citation
Okii, D., Badji, A., Odong, T., Talwana, H., Tukamuhabwa, P., Magdalena, W., ... & Mukankusi, C. (2019). Responses to selection for yield traits and key diseases among common bean genetic pyramids across locations. Journal of Crop Improvement, 33(6), 834-854. https://doi.org/10.1080/15427528.2019.1673270