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A Simple Method for Isolation of Soybean Protoplasts and Application to Transient Gene Expression Analyses
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AFLP mapping of soybean maturity gene E4.

Hisakazu Matsumura1, Baohui Liu, Jun Abe

  • 1Graduate School of Life and Environmental Sciences, University of Tsukuba, 2-1-18 Kannondai, Tsukuba, Ibaraki, 305-8518 Japan.

The Journal of Heredity
|February 26, 2008
PubMed
Summary

Researchers fine-mapped the E4 locus in soybean, crucial for early maturity and chilling tolerance. New markers flanking E4 will aid in developing improved soybean cultivars through marker-assisted selection.

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Area of Science:

  • Plant Genetics
  • Crop Science
  • Molecular Biology

Background:

  • Soybean flowering and maturity are influenced by genes E1-E7 and J.
  • The E4 locus is key for early maturity and chilling tolerance, with its recessive allele conferring both traits.
  • Previous research indicated E1-E5 and E7 affect low-temperature seed coat browning tolerance.

Purpose of the Study:

  • To fine-map the E4 locus in soybean using amplified fragment length polymorphism (AFLP) analysis.
  • To identify new molecular markers for the E4 locus to facilitate breeding efforts.
  • To develop precise markers for marker-assisted selection and gene isolation.

Main Methods:

  • AFL P analysis was performed on a F(8:9) soybean family segregating for E4.
  • A cross between photoperiod-insensitive Japanese landraces Sakamotowase (E4) and Miharudaizu (e4) was utilized.

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  • Linkage mapping integrated 16 AFLP markers into the existing genetic map of linkage group I.

    • Main Results:

    • AFL P analysis with 4096 primer pairs identified 20 polymorphic markers.
    • Eight new AFLP markers were localized in regions between E4 and previously identified markers.
    • Two AFLP markers, e48m41-8 and e18m38-8, were mapped 0.6 and 5.4 cM from E4, respectively.

    Conclusions:

    • The identified flanking markers are in cis arrangement with the recessive e4 allele, associated with photoperiod insensitivity and chilling tolerance.
    • These markers are valuable for fine mapping the E4 locus and for marker-assisted selection in soybean breeding.
    • The markers provide a foundation for isolating the gene underlying the E4 locus through genome walking.