QTLs conditioning early growth in a soybean population segregating for growth habit |
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Authors: | M A R Mian D A Ashley W K Vencill H R Boerma |
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Institution: | (1) Department of Crop and Soil Sciences, University of Georgia, Athens, GA 30602-7272, USA Fax: +1 706-542-0560 E-mail: rboerma@arches.uga.edu, GE |
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Abstract: | There are both economic and environmental reasons for reducing the use of herbicides for weed control in soybean Glycine max (L.) Merr.] fields. Optimizing crop competitiveness can reduce reliance on chemical weed control. Fast and vigorous early
growth and rapid canopy development can be effective in suppressing weed infestation of crop plants. The purposes of this
study were to identify and molecularly map the quantitative trait loci (QTLs) conditioning soybean plant height and canopy
width during the early vegetative stages of soybean growth. A restriction fragment length polymorphism (RFLP) linkage map
was created using 142 markers and 116 F2-derived lines from a cross of ‘S100’בTokyo’. The parents and the 116 F2-derived lines were evaluated in the greenhouse and in the field at Athens, Ga., in 1996 and 1997. Combined over environments,
Tokyo averaged 41 and 17% taller plants than S100 at the V7 and V10 stages of development. Transgressive segregation was observed
among the progeny at both stages. Based on single-factor analysis of variance (ANOVA), three and four independent RFLP loci
were associated with plant height at the V7 and V10 stages, respectively. All three loci detected on linkage groups (LGs)
C2 and F, and unlinked] at the V7 stage were also detected at the V10 stage along with one additional independent locus on
LG E. The Tokyo allele contributed to increased plant height at all loci except at the unlinked locus. Three QTLs (on LGs
C2, E, and F) were consistent across environments, three (on LGs C2 and F, and unlinked) were consistent across stages of
plant development, and two (on LGs C2 and F) were consistent both across environments and stages of plant development. Within
each stage of development, there was no interaction among the independent loci, and the respective loci together explained
most of the variation in the traits. Three independent RFLP loci were associated with canopy width at the V10 stage, of which
one was unique to the trait, while the remaining loci (on LGs C2 and F) were in common with the independent loci for plant
height. Canopy width had a strong correlation (r=0.87) with plant height at the V10 stage. However, mature plant height, lodging, or seed weight had no phenotypic or QTL
association with early plant height or canopy width.
Received: 10 May 1998 / Accepted: 13 July 1998 |
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Keywords: | Soybean Glycine max RFLP QTL Plant height Canopy width |
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