Diversity of common bean (phaseolus vulgaris l.) varieties in iron and zinc contents from collections in major bean growing areas of Tanzania
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Date
2008
Authors
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Publisher
Sokoine University of Agriculture
Abstract
Two experiments were conducted to determine the diversity of common bean
(Phaseolus vulgaris L.) varieties in Fe and Zn contents. In total, 90 varieties were
collected from major bean growing Regions of Tanzania. Twenty varieties were
randomly selected for field experiment, while all 90 varieties were used for screen
house experiment at SUA. In the screen house experiment, a Completely
Randomized Design with three replications was used. The field experiment was
conducted at SUA-Morogoro and Madiira-Arusha. A randomized complete block
design with 20 varieties replicated three times. Seeds and leaves from both
experiments were collected, dried, ground and the powder was used for Fe and Zn
determination. Variation in Fe and Zn contents was observed among varieties in both
seeds and leaves, and the best varieties were identified.
Results have shown a
positive and highly significant (P<0.001) correlation between leaves and seeds Fe
and Zn, suggesting that genetic factors for increasing Fe are co-segregating with
genetic factors for increasing Zn. Levels of Fe and Zn concentration among varieties
at two sites was very different emphasizing the effect of both the environment and
genotype. However, Leaves of the studied varieties have shown to have above
average Fe and Zn contents thus forming a good source of the micronutrients in areas
where bean leaves are consumed as vegetables. From this study, it is recommended
that varieties that were found having high amount of Fe and Zn be used as a gene
source in future breeding work, meanwhile, farmers should use those varieties for
consumption and production.
Description
Masters Theses
Keywords
Diversity-common bean, {phaseolus vulgaris l.), Zinc-iron varieties, Bean growing, Micronutrients Tanzania