The variety mixture strategy assessed in a G × G experiment with rice and the blast fungus Magnaporthe oryzae
Frequent and devastating epidemics of parasites are one of the major issues encountered by modern agriculture. To manage the impact of pathogens, resistant plant varieties have been selected. However, resistances are overcome by parasites requiring the use of pesticides and causing new economical and food safety issues. A promising strategy to maintain the epidemic at a low level and hamper pathogen's adaptation to varietal resistance is the use of mixtures of varieties such that the mix will form a heterogeneous environment for the parasite. A way to find the good combination of varieties that will actually constitute a heterogeneous environment for pathogens is to look for genotype × genotype (G × G) interactions between pathogens and plant varieties. A pattern in which pathogens have a high fitness on one variety and a poor fitness on other varieties guarantees the efficiency of the mixture strategy. In the present article, we inoculated 18 different genotypes of the fungus Magnaporthe oryzae on three rice plant varieties showing different levels of partial resistance in order to find a variety combination compatible with the requirements of the variety mixture strategy, i.e., showing appropriate G × G interactions. We estimated the success of each plant-fungus interaction by measuring fungal fitness and three fungal life history traits: infection success, within-host growth, sporulation capacity. Our results show the existence of G × G interactions between the two varieties Ariete and CO39 on all measured traits and fungal fitness. We also observed that these varieties have different resistance mechanisms; Ariete is good at controlling infection success of the parasite but is not able to control its growth when inside the leaf, while CO39 shows the opposite pattern. We also found that Maratelli's resistance has been eroded. Finally, correlation analyses demonstrated that not all infectious traits are positively correlated.
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dig-cirad-fr-5719402024-01-28T21:49:11Z http://agritrop.cirad.fr/571940/ http://agritrop.cirad.fr/571940/ The variety mixture strategy assessed in a G × G experiment with rice and the blast fungus Magnaporthe oryzae. Gallet Romain, Bonnot François, Milazzo Joëlle, Tertois Christophe, Adreit Henri, Ravigné Virginie, Tharreau Didier, Fournier Elisabeth. 2014. Frontiers in Genetics, 4 (312), 11 p.https://doi.org/10.3389/fgene.2013.00312 <https://doi.org/10.3389/fgene.2013.00312> The variety mixture strategy assessed in a G × G experiment with rice and the blast fungus Magnaporthe oryzae Gallet, Romain Bonnot, François Milazzo, Joëlle Tertois, Christophe Adreit, Henri Ravigné, Virginie Tharreau, Didier Fournier, Elisabeth eng 2014 Frontiers in Genetics H20 - Maladies des plantes F30 - Génétique et amélioration des plantes F08 - Systèmes et modes de culture Oryza sativa Magnaporthe grisea résistance aux maladies résistance génétique méthode de lutte contrôle de maladies culture en mélange variété variation génétique interaction génique relation hôte pathogène http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_37090 http://aims.fao.org/aos/agrovoc/c_2328 http://aims.fao.org/aos/agrovoc/c_35130 http://aims.fao.org/aos/agrovoc/c_5728 http://aims.fao.org/aos/agrovoc/c_2327 http://aims.fao.org/aos/agrovoc/c_4871 http://aims.fao.org/aos/agrovoc/c_8157 http://aims.fao.org/aos/agrovoc/c_15975 http://aims.fao.org/aos/agrovoc/c_32461 http://aims.fao.org/aos/agrovoc/c_34017 France http://aims.fao.org/aos/agrovoc/c_3081 Frequent and devastating epidemics of parasites are one of the major issues encountered by modern agriculture. To manage the impact of pathogens, resistant plant varieties have been selected. However, resistances are overcome by parasites requiring the use of pesticides and causing new economical and food safety issues. A promising strategy to maintain the epidemic at a low level and hamper pathogen's adaptation to varietal resistance is the use of mixtures of varieties such that the mix will form a heterogeneous environment for the parasite. A way to find the good combination of varieties that will actually constitute a heterogeneous environment for pathogens is to look for genotype × genotype (G × G) interactions between pathogens and plant varieties. A pattern in which pathogens have a high fitness on one variety and a poor fitness on other varieties guarantees the efficiency of the mixture strategy. In the present article, we inoculated 18 different genotypes of the fungus Magnaporthe oryzae on three rice plant varieties showing different levels of partial resistance in order to find a variety combination compatible with the requirements of the variety mixture strategy, i.e., showing appropriate G × G interactions. We estimated the success of each plant-fungus interaction by measuring fungal fitness and three fungal life history traits: infection success, within-host growth, sporulation capacity. Our results show the existence of G × G interactions between the two varieties Ariete and CO39 on all measured traits and fungal fitness. We also observed that these varieties have different resistance mechanisms; Ariete is good at controlling infection success of the parasite but is not able to control its growth when inside the leaf, while CO39 shows the opposite pattern. We also found that Maratelli's resistance has been eroded. Finally, correlation analyses demonstrated that not all infectious traits are positively correlated. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/571940/1/document_571940.pdf application/pdf Cirad license info:eu-repo/semantics/openAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.3389/fgene.2013.00312 10.3389/fgene.2013.00312 info:eu-repo/semantics/altIdentifier/doi/10.3389/fgene.2013.00312 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.3389/fgene.2013.00312 |
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H20 - Maladies des plantes F30 - Génétique et amélioration des plantes F08 - Systèmes et modes de culture Oryza sativa Magnaporthe grisea résistance aux maladies résistance génétique méthode de lutte contrôle de maladies culture en mélange variété variation génétique interaction génique relation hôte pathogène http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_37090 http://aims.fao.org/aos/agrovoc/c_2328 http://aims.fao.org/aos/agrovoc/c_35130 http://aims.fao.org/aos/agrovoc/c_5728 http://aims.fao.org/aos/agrovoc/c_2327 http://aims.fao.org/aos/agrovoc/c_4871 http://aims.fao.org/aos/agrovoc/c_8157 http://aims.fao.org/aos/agrovoc/c_15975 http://aims.fao.org/aos/agrovoc/c_32461 http://aims.fao.org/aos/agrovoc/c_34017 http://aims.fao.org/aos/agrovoc/c_3081 H20 - Maladies des plantes F30 - Génétique et amélioration des plantes F08 - Systèmes et modes de culture Oryza sativa Magnaporthe grisea résistance aux maladies résistance génétique méthode de lutte contrôle de maladies culture en mélange variété variation génétique interaction génique relation hôte pathogène http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_37090 http://aims.fao.org/aos/agrovoc/c_2328 http://aims.fao.org/aos/agrovoc/c_35130 http://aims.fao.org/aos/agrovoc/c_5728 http://aims.fao.org/aos/agrovoc/c_2327 http://aims.fao.org/aos/agrovoc/c_4871 http://aims.fao.org/aos/agrovoc/c_8157 http://aims.fao.org/aos/agrovoc/c_15975 http://aims.fao.org/aos/agrovoc/c_32461 http://aims.fao.org/aos/agrovoc/c_34017 http://aims.fao.org/aos/agrovoc/c_3081 |
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H20 - Maladies des plantes F30 - Génétique et amélioration des plantes F08 - Systèmes et modes de culture Oryza sativa Magnaporthe grisea résistance aux maladies résistance génétique méthode de lutte contrôle de maladies culture en mélange variété variation génétique interaction génique relation hôte pathogène http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_37090 http://aims.fao.org/aos/agrovoc/c_2328 http://aims.fao.org/aos/agrovoc/c_35130 http://aims.fao.org/aos/agrovoc/c_5728 http://aims.fao.org/aos/agrovoc/c_2327 http://aims.fao.org/aos/agrovoc/c_4871 http://aims.fao.org/aos/agrovoc/c_8157 http://aims.fao.org/aos/agrovoc/c_15975 http://aims.fao.org/aos/agrovoc/c_32461 http://aims.fao.org/aos/agrovoc/c_34017 http://aims.fao.org/aos/agrovoc/c_3081 H20 - Maladies des plantes F30 - Génétique et amélioration des plantes F08 - Systèmes et modes de culture Oryza sativa Magnaporthe grisea résistance aux maladies résistance génétique méthode de lutte contrôle de maladies culture en mélange variété variation génétique interaction génique relation hôte pathogène http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_37090 http://aims.fao.org/aos/agrovoc/c_2328 http://aims.fao.org/aos/agrovoc/c_35130 http://aims.fao.org/aos/agrovoc/c_5728 http://aims.fao.org/aos/agrovoc/c_2327 http://aims.fao.org/aos/agrovoc/c_4871 http://aims.fao.org/aos/agrovoc/c_8157 http://aims.fao.org/aos/agrovoc/c_15975 http://aims.fao.org/aos/agrovoc/c_32461 http://aims.fao.org/aos/agrovoc/c_34017 http://aims.fao.org/aos/agrovoc/c_3081 Gallet, Romain Bonnot, François Milazzo, Joëlle Tertois, Christophe Adreit, Henri Ravigné, Virginie Tharreau, Didier Fournier, Elisabeth The variety mixture strategy assessed in a G × G experiment with rice and the blast fungus Magnaporthe oryzae |
description |
Frequent and devastating epidemics of parasites are one of the major issues encountered by modern agriculture. To manage the impact of pathogens, resistant plant varieties have been selected. However, resistances are overcome by parasites requiring the use of pesticides and causing new economical and food safety issues. A promising strategy to maintain the epidemic at a low level and hamper pathogen's adaptation to varietal resistance is the use of mixtures of varieties such that the mix will form a heterogeneous environment for the parasite. A way to find the good combination of varieties that will actually constitute a heterogeneous environment for pathogens is to look for genotype × genotype (G × G) interactions between pathogens and plant varieties. A pattern in which pathogens have a high fitness on one variety and a poor fitness on other varieties guarantees the efficiency of the mixture strategy. In the present article, we inoculated 18 different genotypes of the fungus Magnaporthe oryzae on three rice plant varieties showing different levels of partial resistance in order to find a variety combination compatible with the requirements of the variety mixture strategy, i.e., showing appropriate G × G interactions. We estimated the success of each plant-fungus interaction by measuring fungal fitness and three fungal life history traits: infection success, within-host growth, sporulation capacity. Our results show the existence of G × G interactions between the two varieties Ariete and CO39 on all measured traits and fungal fitness. We also observed that these varieties have different resistance mechanisms; Ariete is good at controlling infection success of the parasite but is not able to control its growth when inside the leaf, while CO39 shows the opposite pattern. We also found that Maratelli's resistance has been eroded. Finally, correlation analyses demonstrated that not all infectious traits are positively correlated. |
format |
article |
topic_facet |
H20 - Maladies des plantes F30 - Génétique et amélioration des plantes F08 - Systèmes et modes de culture Oryza sativa Magnaporthe grisea résistance aux maladies résistance génétique méthode de lutte contrôle de maladies culture en mélange variété variation génétique interaction génique relation hôte pathogène http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_37090 http://aims.fao.org/aos/agrovoc/c_2328 http://aims.fao.org/aos/agrovoc/c_35130 http://aims.fao.org/aos/agrovoc/c_5728 http://aims.fao.org/aos/agrovoc/c_2327 http://aims.fao.org/aos/agrovoc/c_4871 http://aims.fao.org/aos/agrovoc/c_8157 http://aims.fao.org/aos/agrovoc/c_15975 http://aims.fao.org/aos/agrovoc/c_32461 http://aims.fao.org/aos/agrovoc/c_34017 http://aims.fao.org/aos/agrovoc/c_3081 |
author |
Gallet, Romain Bonnot, François Milazzo, Joëlle Tertois, Christophe Adreit, Henri Ravigné, Virginie Tharreau, Didier Fournier, Elisabeth |
author_facet |
Gallet, Romain Bonnot, François Milazzo, Joëlle Tertois, Christophe Adreit, Henri Ravigné, Virginie Tharreau, Didier Fournier, Elisabeth |
author_sort |
Gallet, Romain |
title |
The variety mixture strategy assessed in a G × G experiment with rice and the blast fungus Magnaporthe oryzae |
title_short |
The variety mixture strategy assessed in a G × G experiment with rice and the blast fungus Magnaporthe oryzae |
title_full |
The variety mixture strategy assessed in a G × G experiment with rice and the blast fungus Magnaporthe oryzae |
title_fullStr |
The variety mixture strategy assessed in a G × G experiment with rice and the blast fungus Magnaporthe oryzae |
title_full_unstemmed |
The variety mixture strategy assessed in a G × G experiment with rice and the blast fungus Magnaporthe oryzae |
title_sort |
variety mixture strategy assessed in a g × g experiment with rice and the blast fungus magnaporthe oryzae |
url |
http://agritrop.cirad.fr/571940/ http://agritrop.cirad.fr/571940/1/document_571940.pdf |
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