Partial resistance to Melampsora larici-populina leaf rust in hybrid poplars: Genetic variability in inoculated excised leaf disk bioassay and relationship with complete resistance
Identifieur interne : 001350 ( Main/Merge ); précédent : 001349; suivant : 001351Partial resistance to Melampsora larici-populina leaf rust in hybrid poplars: Genetic variability in inoculated excised leaf disk bioassay and relationship with complete resistance
Auteurs : A. Dowkiw [France] ; C. Husson [France] ; P. Frey [France] ; J. Pinon [France] ; C. Bastien [France]Source :
- Phytopathology [ 0031-949X ] ; 2003.
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- Pascal (Inist)
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Abstract
Inoculated excised leaf disk technique allows decomposition of poplar partial resistance to Melampsora larici-populina leaf rust into key epidemiological components such as latent period (LP), uredinia number (UN), uredinia size (US), and spore production (SP) for a given M. larici-populina strain under controlled environmental conditions. Three hundred thirty-six genotypes from an interspecific Populus dehoides x P trichocarpa F1 progeny segregating for complete resistance to M. laricipopulina strain 931D6 were inoculated with M. larici-populinastrain 93CV1 This strain was able to infect the whole family, except few probable recombinants. LP. final UN. and final US after one infectious cycle proved to be relevant complementary descriptors of partial resistance. Area under the disease progress curve and other parameters of uredinia appearance dynamics did not yield additional information. Indirect assessment of SP by US scoring was reliable and easy to access compared with direct spore counting. UN was the only trait for which a doubling of the inoculum pressure level had a significant effect, leading to greater differentiation between genotypes. Consistent with previous studies is the clear relationship between presence of complete resistance against M. larici-populinastrain 931D6 and higher partial resistance to M. larici-populinu strain 93CV1 (32% longer LP. 76% smaller UN, and 34% smaller US). In the subpopulation compatible with 931D6, bimodal distribution of genotypic means for US suggested implication of a major gene inherited from the P trichocarpaparent. Residual variation was noted for the three epidemiological components, suggesting that additional genes might condition these quantitative traits.
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Dowkiw</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Institut National de la Recherche Agronomique (INRA), Unité Améliortation, Génétique et Physiologie Forestières, av. de la Pomme de Pin, BP 20619 Ardon</s1><s2>45166 Olivet</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Centre-Val de Loire</region><region type="old region" nuts="2">Région Centre</region><settlement type="city">Olivet</settlement></placeName></affiliation></author><author><name sortKey="Husson, C" sort="Husson, C" uniqKey="Husson C" first="C." last="Husson">C. Husson</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Institut National de la Recherche Agronomique (INRA), Unité de Pathologie Forestière</s1><s2>54280 Champenoux</s2><s3>FRA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Lorraine (région)</region><settlement type="city">Champenoux</settlement></placeName></affiliation></author><author><name sortKey="Frey, P" sort="Frey, P" uniqKey="Frey P" first="P." last="Frey">P. Frey</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Institut National de la Recherche Agronomique (INRA), Unité de Pathologie Forestière</s1><s2>54280 Champenoux</s2><s3>FRA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Lorraine (région)</region><settlement type="city">Champenoux</settlement></placeName></affiliation></author><author><name sortKey="Pinon, J" sort="Pinon, J" uniqKey="Pinon J" first="J." last="Pinon">J. Pinon</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Institut National de la Recherche Agronomique (INRA), Unité de Pathologie Forestière</s1><s2>54280 Champenoux</s2><s3>FRA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Lorraine (région)</region><settlement type="city">Champenoux</settlement></placeName></affiliation></author><author><name sortKey="Bastien, C" sort="Bastien, C" uniqKey="Bastien C" first="C." last="Bastien">C. Bastien</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Institut National de la Recherche Agronomique (INRA), Unité Améliortation, Génétique et Physiologie Forestières, av. de la Pomme de Pin, BP 20619 Ardon</s1><s2>45166 Olivet</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Centre-Val de Loire</region><region type="old region" nuts="2">Région Centre</region><settlement type="city">Olivet</settlement></placeName></affiliation></author></analytic><series><title level="j" type="main">Phytopathology</title><title level="j" type="abbreviated">Phytopathology</title><idno type="ISSN">0031-949X</idno><imprint><date when="2003">2003</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Phytopathology</title><title level="j" type="abbreviated">Phytopathology</title><idno type="ISSN">0031-949X</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Bioassay</term><term>Gene</term><term>Genetic variability</term><term>Melampsora larici-populina</term><term>Populus trichocarpa</term><term>Resistance</term><term>Spores</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Melampsora larici-populina</term><term>Populus trichocarpa</term><term>Résistance</term><term>Variabilité génétique</term><term>Essai biologique</term><term>Spore</term><term>Gène</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Inoculated excised leaf disk technique allows decomposition of poplar partial resistance to Melampsora larici-populina leaf rust into key epidemiological components such as latent period (LP), uredinia number (UN), uredinia size (US), and spore production (SP) for a given M. larici-populina strain under controlled environmental conditions. Three hundred thirty-six genotypes from an interspecific Populus dehoides x P trichocarpa F<sub>1</sub> progeny segregating for complete resistance to M. laricipopulina strain 931D6 were inoculated with M. larici-populinastrain 93CV1 This strain was able to infect the whole family, except few probable recombinants. LP. final UN. and final US after one infectious cycle proved to be relevant complementary descriptors of partial resistance. Area under the disease progress curve and other parameters of uredinia appearance dynamics did not yield additional information. Indirect assessment of SP by US scoring was reliable and easy to access compared with direct spore counting. UN was the only trait for which a doubling of the inoculum pressure level had a significant effect, leading to greater differentiation between genotypes. Consistent with previous studies is the clear relationship between presence of complete resistance against M. larici-populinastrain 931D6 and higher partial resistance to M. larici-populinu strain 93CV1 (32% longer LP. 76% smaller UN, and 34% smaller US). In the subpopulation compatible with 931D6, bimodal distribution of genotypic means for US suggested implication of a major gene inherited from the P trichocarpaparent. Residual variation was noted for the three epidemiological components, suggesting that additional genes might condition these quantitative traits.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Centre-Val de Loire</li><li>Grand Est</li><li>Lorraine (région)</li><li>Région Centre</li></region><settlement><li>Champenoux</li><li>Olivet</li></settlement></list><tree><country name="France"><region name="Centre-Val de Loire"><name sortKey="Dowkiw, A" sort="Dowkiw, A" uniqKey="Dowkiw A" first="A." last="Dowkiw">A. Dowkiw</name></region><name sortKey="Bastien, C" sort="Bastien, C" uniqKey="Bastien C" first="C." last="Bastien">C. Bastien</name><name sortKey="Frey, P" sort="Frey, P" uniqKey="Frey P" first="P." last="Frey">P. Frey</name><name sortKey="Husson, C" sort="Husson, C" uniqKey="Husson C" first="C." last="Husson">C. Husson</name><name sortKey="Pinon, J" sort="Pinon, J" uniqKey="Pinon J" first="J." last="Pinon">J. Pinon</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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