Potential of Eurasian poplar rust to overcome a major quantitative resistance factor

Dowkiw, Arnaud; Voisin, Elodie; Bastien, Catherine

doi:10.1111/j.1365-3059.2010.02277.x

Cited by 12 publications

(12 citation statements)

References 46 publications

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“…This feature, commonly observed for decades in qualitative resistance (Vanderplank 1975), was more recently described for quantitative resistance (Vale et al 2001) and has been recently fully described for a major quantitative resistance factor in the Melampsora larici-populina/Populus spp. pathosystem (Dowkiw et al 2010). A field experiment with the same studied progeny in the Brazilian state of Bahia would also be essential to provide an explanation for the durability of the resistance of MDF 180.…”

Section: Discussionmentioning

confidence: 98%

A rubber tree’s durable resistance to Microcyclus ulei is conferred by a qualitative gene and a major quantitative resistance factor

Guen

García

Doare³

et al. 2011

Tree Genetics & Genomes

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The components of genetic resistance from the Hevea brasiliensis cultivar MDF 180 against South American Leaf Blight (SALB) caused by Microcyclus ulei were investigated by QTL mapping. MDF 180 has already been described as a cultivar with a high level of partial and long-lasting resistance. The resistance of progeny individuals from a cross between a susceptible cultivar and MDF 180 was assessed both under controlled conditions of inoculation by three M. ulei isolates and under natural infection in a field trial. Genetic maps of the two parents of this progeny were mainly established based on microsatellites and AFLP markers. No resistance QTL were found in the susceptible parent. In the resistant parent, we identified a qualitative gene responsible for the resistance against isolates from French Guiana and a major quantitative resistance factor determining the resistance against isolates from the state of Bahia (Brazil). The qualitative resistance gene was denominated M15md and was located in the linkage group g15. Four minor resistance QTLs were also identified, two of which showed an epistatic interaction with M15md. The durability of the resistance of MDF 180 is discussed in light of these data.

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Section: Discussionmentioning

confidence: 98%

A rubber tree’s durable resistance to Microcyclus ulei is conferred by a qualitative gene and a major quantitative resistance factor

Guen

García

Doare³

et al. 2011

Tree Genetics & Genomes

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“…R US has been shown to explain up to 80% of the variation for three components of quantitative resistance (latent period, size of uredinia and number of uredinia) after inoculation with seven Mlp strains. Recently, Dowkiw et al (2010) identified several R US -defeating strains which overcame the effect of R US in different poplar genetic backgrounds. The other major locus is inherited from the P. deltoides parent and is associated either by pleiotropy or linkage with the qualitative resistance R 1 .…”

Section: New Phytologist Researchmentioning

confidence: 99%

Qualitative and quantitative resistances to leaf rust finely mapped within two nucleotide‐binding site leucine‐rich repeat (NBS‐LRR)‐rich genomic regions of chromosome 19 in poplar

Bresson¹,

Jorge

Dowkiw

et al. 2011

New Phytologist

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Summary• R US is a major dominant gene controlling quantitative resistance, inherited from Populus trichocarpa, whereas R 1 is a gene governing qualitative resistance, inherited from P. deltoides.• Here, we report a reiterative process of concomitant fine-scale genetic and physical mapping guided by the P. trichocarpa genome sequence. The highresolution linkage maps were developed using a P. deltoides · P. trichocarpa progeny of 1415 individuals. R US and R 1 were mapped in a peritelomeric region of chromosome 19. Markers closely linked to R US were used to screen a bacterial artificial chromosome (BAC) library constructed from the P. trichocarpa parent, heterozygous at the locus R US .• Two local physical maps were developed, one encompassing the R US allele and the other spanning r US . The alignment of the two haplophysical maps showed structural differences between haplotypes. The genetic and physical maps were anchored to the genome sequence, revealing genome sequence misassembly. Finally, the R US locus was localized within a 0.8-cM interval, whereas R 1 was localized upstream of R US within a 1.1-cM interval.• The alignment of the genetic and physical maps with the local reorder of the chromosome 19 sequence indicated that R US and R 1 belonged to a genomic region rich in nucleotide-binding site leucine-rich repeat (NBS-LRR) and serine threonine kinase (STK) genes.

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“…A high degree of synteny exists between the willow and the poplar genomes (Berlin et al 2010), which gives an opportunity to identify candidate genes underlying rust resistance QTLs by utilizing the publicly available Populus genomic resources. In poplar, both qualitative and quantitative M. larici-populina resistance has been described (Lefèvre et al 1994(Lefèvre et al , 1998Dowkiw et al 2003Dowkiw et al , 2010Bastien 2004, 2007;Jorge et al 2005). QTL mapping in a Populus deltoides×Populus trichocarpa family revealed two major and seven smaller resistance QTLs associated to the traits latent period, uredinia number, uredinia size, and field resistance (Jorge et al 2005).…”

Section: Introductionmentioning

confidence: 97%

QTL mapping of resistance to leaf rust in Salix

Samils

Rönnberg‐Wästljung

Stenlid

2011

Tree Genetics & Genomes

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Genetic mapping of quantitative trait loci (QTL) for resistance to Melampsora leaf rust was performed in two willow families: the progeny from a backcross between Salix viminalis and a hybrid S. viminalis×Salix schwerinii (population S 1 ), and the F 1 progeny of a cross between two S. viminalis (population S 3 ). Disease levels were scored in the field for three consecutive years. In the laboratory, five different rust strains were sprayed onto leaf disks and the following resistance components were scored: latent period, diameter and number of uredinia, and flecking. One major QTL and 14 smaller were identified in the S 1 host population. One rust strain, that represents a Melampsora form with limited incidence on S. viminalis, showed lower aggressiveness to the S 1 host population together with a different pattern in QTLs. In the S 3 host population, we detected 13 QTLs for rust resistance, of which two were located to the same genomic regions as those found for the S 1 population. We showed that the strongest QTL cosegregated with a gene homologous to a known Toll/ interleukin receptor-nucleotide binding site-leucine-rich repeat resistance gene in poplar. The importance of the identified QTLs is discussed in relation to breeding for durable resistance.

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Potential of Eurasian poplar rust to overcome a major quantitative resistance factor

Cited by 12 publications

References 46 publications

A rubber tree’s durable resistance to Microcyclus ulei is conferred by a qualitative gene and a major quantitative resistance factor

A rubber tree’s durable resistance to Microcyclus ulei is conferred by a qualitative gene and a major quantitative resistance factor

Qualitative and quantitative resistances to leaf rust finely mapped within two nucleotide‐binding site leucine‐rich repeat (NBS‐LRR)‐rich genomic regions of chromosome 19 in poplar

QTL mapping of resistance to leaf rust in Salix

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