Traits associated with dry edible bean (Phaseolus vulgaris L.) productivity under diverse soil moisture environments |
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Authors: | Amare Abebe Shenkut Mark A Brick |
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Institution: | (1) Department of Soil and Crop Sciences, Colorado State University, Fort Collins, CO, 80523, U.S.A |
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Abstract: | Two experiments were conducted in the Rift Valley, Ethiopia (8°N and 39°E) to determine associations between eight plant traits
and seed yield, and to obtain estimates of narrow sense heritability for the traits. Experiment I evaluated seven dry edible
bean cultivars/lines at two locations to simulate different soil moisture stress, including, Debre Zeit(non-stress) and Dera
(moderate-stress). Experiment II evaluated 25 cultivars/lines in three environments including, Melkassa early planted (non-stress),
Melkassa late planted (high-stress), and Dera (moderate-stress). A randomized-complete-block design with three replicates
was used in both experiments. Plant traits evaluated were seed yield, pods plant-1, seeds pod-1, 100 seed weight, root dry weight, hypocotyl diameter, plant biomass, plant height and days to flowering. Plant traits that
were significantly associated with seed yield were included in a stepwise-regression model to determine which trait or combination
of traits provided the best model to estimate seed yield in each environment. An analysis of variance was conducted to test
main effects and interactions between plant traits and environments. Significant variation among lines occurred for seed yield
and all plant traits in both experiments. Strong positive correlations were observed between plant biomass and seed yield
in all environments. Seed yield and pods plant-1 were also highly associated in four of the five environments. Stepwise regression models indicated that the combination of
pods plant-1 and plant biomass consistently contributed to seed yield prediction, while other traits did not. Because both plant biomass
and pods plant-1 had moderate to high narrow sense heritability estimates and low GE interactions, they should be useful as indirect selection
criteria to improve and stabilize seed yield in a breeding program.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | breeding common bean drought stress productivity Phaseolus vulgarisL seed yield |
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