Quantitative trait locus (QTL) analysis of wood quality traits in <Emphasis Type="Italic">Eucalyptus nitens</Emphasis> |
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Authors: | Bala R Thumma Simon G Southerton John C Bell John V Owen Martin L Henery Gavin F Moran |
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Institution: | (1) CSIRO Plant Industry, GPO Box 1600, Canberra, ACT, 2601, Australia;(2) Research School of Biology, Australian National University, Canberra, ACT, 0200, Australia |
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Abstract: | To identify the chromosomal regions affecting wood quality traits, we conducted a genome-wide quantitative trait locus (QTL)
analysis of wood quality traits in Eucalyptus nitens. This information is important to exploit the full potential of the impending Eucalyptus genome sequence. A three generational mapping population consisting of 296 progeny trees was used to identify QTL associated
with several wood quality traits in E. nitens. Thirty-six QTL positions for cellulose content, pulp yield, lignin content, density, and microfibril angle (MFA) were identified
across different linkage groups. On linkage groups (LG)2 and 8, cellulose QTL cluster with pulp yield and extractives QTL
while on LG4 and 10 cellulose and pulp yield QTLs cluster together. Similarly, on LG4, 5, and 6 QTL for lignin traits were
clustered together. At two positions, QTL for MFA, a physical trait related to wood stiffness, were clustered with QTL for
lignin traits. Several cell wall candidate genes were co-located to QTL positions affecting different traits. Comparative
QTL analysis with Eucalyptus globulus revealed two common QTL regions for cellulose and pulp yield. The QTL positions identified in this study provide a resource
for identifying wood quality genes using the impending Eucalyptus genome sequence. Candidate genes identified in this study through co-location to QTL regions may be useful in association
studies. |
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