Quantitative analysis and QTL mapping for agronomic and fiber traits in an RI population of upland cotton |
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| Authors: | Jixiang Wu Osman Ariel Gutierrez Johnie N Jenkins Jack C McCarty Jun Zhu |
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| Institution: | (1) Department of Plant and Soil Sciences, Mississippi State University, P.O. Box 9555, Mississippi State, MS 39762, USA;(2) Crop Science Research Laboratory, USDA-ARS, P.O. Box 5367, Mississippi State, MS 39762, USA;(3) Institute of Bioinformatics, Zhejiang University, Hangzhou, Zhejiang, 310029, China |
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| Abstract: | Genetic mapping is an essential tool for cotton (Gossypium hirsutum L.) molecular breeding and application of DNA markers for cotton improvement. In this present study, we evaluated an RI population
including 188 RI lines developed from 94 F2-derived families and their two parental lines, ‘HS 46’ and ‘MARCABUCAG8US-1-88’, at Mississippi State, MS, for two years.
Fourteen agronomic and fiber traits were measured. One hundred forty one (141) polymorphic SSR markers were screened for this
population and 125 markers were used to construct a linkage map. Twenty six linkage groups were constructed, covering 125
SSR loci and 965 cM of overall map distance. Twenty four linkage groups (115 SSR loci) were assigned to specific chromosomes.
Quantitative genetic analysis showed that the genotypic effects accounted for more than 20% of the phenotypic variation for
all traits except fiber perimeter (18%). Fifty six QTLs (LOD > 3.0) associated with 14 agronomic and fiber traits were located
on 17 chromosomes. One QTL associated with fiber elongation was located on linkage group LGU01. Nine chromosomes in sub-A
genome harbored 27 QTLs with 10 associated with agronomic traits and 17 with fiber traits. Eight chromosomes in D sub-genome
harbored 29 QTLs with 13 associated with agronomic traits and 16 with fiber traits. Chromosomes 3, 5, 12, 13, 14, 16, 20,
and 26 harbor important QTLs for both yield and fiber quality compared to other chromosomes. Since this RI population was
developed from an intraspecific cross within upland cotton, these QTLs should be useful for marker assisted selection for
improving breeding efficiency in cotton line development.
Paper number J1116 of the Mississippi Agricultural and Forestry Experiment Station, Mississippi State University, Mississippi
State, MS 39762. Mention of trademark, proprietary product, or vendor does not constitute a guarantee or warranty of the product
by USDA, ARS and does not imply its approval to the exclusion of other products or vendors that may also be suitable. |
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| Keywords: | Linkage mapping QTL Recombinant inbred lines Upland cotton Agronomic traits Fiber traits |
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