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Citation:

Detection of Quantitative Trait Loci Related with Rooting Ability of Cuttings and Growth of Eucalyptus

  • Received Date: 2010-07-28
  • An F1 pedigree of Eucalyptus urophylla×E. tereticornis was used to detect quantitative trait loci (QTLs) controlling four cutting-related traits, i.e. number of roots per cutting, the maximum length of roots, percentage of rooted cuttings and root dry weight, as well as two growth traits, height (H) and breast-high diameter (DBH) of 13-, 18- and 46-month-old Eucalyptus trees. For cutting-related traits, six and seven QTLs were detected on genetic maps of maternal Eucalyptus urophylla and paternal E. tereticornis, respectively, with logarithm of odds (LOD) ranging from 2.0 to 3.9, variance explained from 15.2% to 26.8% and map distance with the closer flanking marker 0.0 to 15.0 cM. For growth traits, two and one QTLs were detected on the maternal map in 46-month-old H and DBH, respectively, though no QTL was found for 13- or 18-month-old growth, and a number of QTLs were located onto the paternal map for all the ages, including four, four, one, two, two and two QTLs for H13, DBH13, H18, DBH18, H46 and DBH46, respectively. No QTL was found to affect significantly the rooting ability of cuttings and field growth simultaneously, implying probably the difference in genes responsible for the two types of traits. Several markers had zero cM of map distance to or linked very closely with QTL, which might act as sound candidate markers for future marker-assisted selection in related traits.
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Detection of Quantitative Trait Loci Related with Rooting Ability of Cuttings and Growth of Eucalyptus

  • 1. Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou 510520, Guangdong, China

Abstract: An F1 pedigree of Eucalyptus urophylla×E. tereticornis was used to detect quantitative trait loci (QTLs) controlling four cutting-related traits, i.e. number of roots per cutting, the maximum length of roots, percentage of rooted cuttings and root dry weight, as well as two growth traits, height (H) and breast-high diameter (DBH) of 13-, 18- and 46-month-old Eucalyptus trees. For cutting-related traits, six and seven QTLs were detected on genetic maps of maternal Eucalyptus urophylla and paternal E. tereticornis, respectively, with logarithm of odds (LOD) ranging from 2.0 to 3.9, variance explained from 15.2% to 26.8% and map distance with the closer flanking marker 0.0 to 15.0 cM. For growth traits, two and one QTLs were detected on the maternal map in 46-month-old H and DBH, respectively, though no QTL was found for 13- or 18-month-old growth, and a number of QTLs were located onto the paternal map for all the ages, including four, four, one, two, two and two QTLs for H13, DBH13, H18, DBH18, H46 and DBH46, respectively. No QTL was found to affect significantly the rooting ability of cuttings and field growth simultaneously, implying probably the difference in genes responsible for the two types of traits. Several markers had zero cM of map distance to or linked very closely with QTL, which might act as sound candidate markers for future marker-assisted selection in related traits.

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