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few mendelian genes underlie the quantitative response of a forest tree, eucalyptus globulus, to a natural fungal epidemic


作者單位:School of Plant Science and Cooperative Research Centre for Forestry, University of Tasmania, Hobart, Tasmania 700 Australia1 Corresponding author: School of Plant Science, University of Tasmania, Private Bag 5 Hobart, Tasmania 700 Australia.

【摘要】 foliar fungal pathogens from the genus mycosphaerella affect eucalypts in natural forests and plantations worldwide. qtl analysis was conducted to dissect the genetic control of resistance in eucalyptus globulus to a natural infection by mycosphaerella leaf disease, using a clonally replicated outbred f 2 family (112 genotypes) planted in a field trial. two major qtl, with high lod support (20.2 and 10.9) and high genomewide significance, explained a large proportion (52%) of the phenotypic variance in the severity of damage by mycosphaerella cryptica, which may be indicative of oligogenic control. both qtl were validated in a second f 2 family and one was validated in a third f 2 family. the mean values of different genotype classes at both major qtl argue for mendelian inheritance with resistance dominant over susceptibility. there were strong correlations between the levels of mycosphaerella damage in related genetic material planted in three widely separated locations in tasmania. these findings together provide evidence that the genes controlling resistance to mycosphaerella damage are stable in different genetic backgrounds and across different environments.

【關鍵詞】 mendelian underlie quantitative response eucalyptus globulus epidemic


the genus eucalyptus (myrtaceae) forms an integral part of the 800 species that dominate most forest types, from coastal to subalpine habitats ( w illiams and b rooker 1997 ). eucalyptus globulus ( sensu b rooker 2000 ) is native to southeastern australia, including tasmania and the bass strait islands ( w illiams and p otts 1996 ) where it is an important component of low-altitude forest ecosystems. eucalypts are the major hardwood species grown in pulpwood plantations throughout the world ( c ossalter and p ye -s mith 2003 ) and e. globulus is the main species grown in temperate regions ( p otts et al. 2004 ).

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