Genotype x environment interaction effect on common bean (phaseolns vulgaris l.) performance and yield stability in Burundi
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Date
2014
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Sokoine University of Agriculture
Abstract
Most of the common bean (Phaseolus vulgaris L.) grown in Burundi are selected with
little reference to stability of seed yield performance, resulting to low yields. Seven
biofort genotypes were tested across three locations (Gisozi, Murongwe and Moso)
during two cropping seasons (2013A and 2013B) using a split plot design replicated three
times for each location and in split split plot design in combined locations. WindoStat
Version 8.5 computer software was used to analyse the collected data. The G x Li
interaction was observed and environmental factors significantly affected the performance
of the present bean genotypes. Based on good performance, each site presented genotypes
which were comparable to the high yielding check variety (GLP2). However, since the
check was the latest to mature, the genotypes which performed almost the same to the
check variety across seasons (KAB06F2-8-24, KAB06F2-8-78, KAB06F2-8-53 and
KAB06F2-8-13) are recommended for confirmation on farmer conditions due to their
early maturity trait. Furthermore, these genotypes showed resistance to intermediate
reaction to diseases and should possibly be used in bean breeding programs as source of
genes for tolerance. The plant population 20cm x 40cm was the best plant density to be
recommended for bush bean. In both cropping seasons high heritability was observed for
Plant Height (63 and 70%) and Days to Physiological Maturity (66 and 75%). Results
revealed the complete absence of genotypes that could be considered to be widely adapted
and stable on seed yield. However, genotypes KAB06F2-8-24 and KAB06F2-8-78 were
adapted to low yielding environments whereas KAB06F2-8-53 and KAB06F2-8-13 were
found suitable in favorable conditions. On the basis of this study, future studies should
focus on more seasons and locations in different agro-ecological zones in order to support
results obtained in this study.
Description
Dissertation
Keywords
Common bean, Biofort genotype, Burundi, Seed stability, Phaseolus vulgaris L.