Theoretical and Applied Genetics

, Volume 92, Issue 3–4, pp 395–402 | Cite as

Mapping quantitative trait loci for seedling vigor in rice using RFLPs

  • E. D. Redoña
  • D. J. Mackill
Article

Abstract

Improving seedling vigor is an important objective of modern rice (Oryza saliva L.) breeding programs. The purpose of this study was to identify and map quantitative trait loci (QTL) underlying seedling vigor-related traits using restriction fragment length polymorphisms (RFLPs). An F2 population of 204 plants was developed from a cross between a low-vigor japonica cultivar ‘Labelle’ (LBL) and a high-vigor indica cultivar ‘Black Gora’ (BG). A linkage map was constructed of 117 markers spanning 1496 Haldane cM and encompassing the 12 rice chromosomes with an average marker spacing of 14 cM. The length of the shoots, roots, coleoptile and mesocotyl were measured on F3 families in slantboard tests conducted at two temperatures (18° and 25°C). By means of interval analysis, 13 QTLs, each accounting for 7% to 38% of the phenotypic variance, were identified and mapped in the two temperature regimes at a log-likelihood (LOD) threshold of 2.5. Four QTLs controlled shoot length, 2 each controlled root and coleoptile lengths and 5 influenced mesocotyl length. Single-point analysis confirmed the presence of these QTLs and detected additional loci for shoot, root and coleoptile lengths, these latter usually accounting for less than 5% of the phenotypic variation. Only 3 QTLs detected both by interval and singlepoint analyses were expressed under both temperature regimes. Additive, dominant and overdominant modes of gene action were observed. Contrary to what was predicted from parental phenotype, the low-vigor LBL contributed 46% of the positive alleles for shoot, root and coleoptile lengths. Positive alleles from the high-vigor parent BG were identified for increased root, coleoptile and mesocotyl lengths. However, BG contributed alleles with only minor effects for shoot length, the most important determinant of seedling vigor in water-seeded rice, suggesting that it would not be an ideal donor parent for introducing faster shoot growth alleles into temperate japonica cultivars.

Key words

Quantitative trait locus (QTL) RFLP Seedling vigor Shoot growth Oryza sauva 

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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • E. D. Redoña
    • 1
  • D. J. Mackill
    • 2
  1. 1.Department of Agronomy and Range ScienceUniversity of CaliforniaDavisUSA
  2. 2.USDA-ARS, Department of Agronomy and Range ScienceUniversity of CaliforniaDavisUSA

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