caa a22 4500 46789096X CHVBK 20180406152749.0 cr unu---uuuuu 170328e20061001xx s 000 0 eng 10.1007/s10327-006-0284-x doi (NATIONALLICENCE)springer-10.1007/s10327-006-0284-x Reduction in aggressiveness among hybrids between host-specific pathotypes of Magnaporthe oryzae is caused by reduced ability to overcome adult resistance at the level of penetration [Elektronische Daten] [Jiro Murakami, Vu Thi, Bich Hau, Shigeyuki Mayama, Yukio Tosa] A genetic cross between a Triticum isolate (pathogenic on wheat) and a Setaria isolate (pathogenic on foxtail millet) of Magnaporthe oryzae yielded several F1 cultures that were virulent on both wheat and foxtail millet at the primary leaf stage. To estimate whether these cultures survive in nature, they were sprayed onto 1-, 2-, and 3-week-old wheat and foxtail millet. As the age of the inoculated plants increased, the lesion number and size were greatly reduced. The F1 cultures were almost nonpathogenic on both wheat and foxtail millet at the 3-week-old stage. Cytological analysis revealed that the low pathogenicity of the F1 cultures on older plants was primarily associated with a reduced ability to penetrate the cuticle. When placed on wounded leaf surfaces, the F1 cultures produced large lesions on 4-week-old wheat and foxtail millet. These results indicate that hybridization between species-specific pathotypes results in a reduction of aggressiveness. We therefore suggest that, even if such hybrids were produced in nature, they might not survive in the natural environment. The Phytopathological Society of Japan and Springer-Verlag Tokyo, 2006 Blast fungus nationallicence Magnaporthe nationallicence Pyricularia nationallicence Wheat nationallicence Foxtail millet nationallicence Murakami Jiro Laboratory of Plant Pathology, Faculty of Agriculture, Graduate School of Science and Technology, Kobe University, 657-8501, Kobe, Nada, Japan aut Thi Vu Laboratory of Plant Pathology, Faculty of Agriculture, Graduate School of Science and Technology, Kobe University, 657-8501, Kobe, Nada, Japan aut Hau Bich Laboratory of Plant Pathology, Faculty of Agriculture, Graduate School of Science and Technology, Kobe University, 657-8501, Kobe, Nada, Japan aut Mayama Shigeyuki Laboratory of Plant Pathology, Faculty of Agriculture, Graduate School of Science and Technology, Kobe University, 657-8501, Kobe, Nada, Japan aut Tosa Yukio Laboratory of Plant Pathology, Faculty of Agriculture, Graduate School of Science and Technology, Kobe University, 657-8501, Kobe, Nada, Japan aut Journal of General Plant Pathology Springer-Verlag 72/5(2006-10-01), 284-291 1345-2630 72:5<284 2006 72 10327 https://doi.org/10.1007/s10327-006-0284-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10327-006-0284-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Murakami Jiro Laboratory of Plant Pathology, Faculty of Agriculture, Graduate School of Science and Technology, Kobe University, 657-8501, Kobe, Nada, Japan aut NATIONALLICENCE 700 1- Thi Vu Laboratory of Plant Pathology, Faculty of Agriculture, Graduate School of Science and Technology, Kobe University, 657-8501, Kobe, Nada, Japan aut NATIONALLICENCE 700 1- Hau Bich Laboratory of Plant Pathology, Faculty of Agriculture, Graduate School of Science and Technology, Kobe University, 657-8501, Kobe, Nada, Japan aut NATIONALLICENCE 700 1- Mayama Shigeyuki Laboratory of Plant Pathology, Faculty of Agriculture, Graduate School of Science and Technology, Kobe University, 657-8501, Kobe, Nada, Japan aut NATIONALLICENCE 700 1- Tosa Yukio Laboratory of Plant Pathology, Faculty of Agriculture, Graduate School of Science and Technology, Kobe University, 657-8501, Kobe, Nada, Japan aut NATIONALLICENCE 773 0- Journal of General Plant Pathology Springer-Verlag 72/5(2006-10-01), 284-291 1345-2630 72:5<284 2006 72 10327 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer