2012 Fiscal Year Final Research Report
Toward breeding for disease resistance using weak alleles inducing hybrid weakness
| Project/Area Number |
23658010
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Breeding science
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| Research Institution | Kobe University |
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Principal Investigator |
TAKUMI Shigeo 神戸大学, 大学院・農学研究科, 准教授 (50249166)
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| Co-Investigator(Renkei-kenkyūsha) |
TOSA Yukio 神戸大学, 大学院・農学研究科, 教授 (20172158)
SATO Kazuhiro 岡山大学, 資源植物科学研究所, 教授 (60215770)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 抵抗性 / 耐性 |
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| Research Abstract |
Synthetic hexaploid wheat (AABBDD genome) is produced through crossing tetraploid wheat (AABB genome) with a D-genome progenitor Aegilops tauschii, and available for common wheat breeding to introduce agronomically useful genes from Ae. tauschii. However, abnormal growth phenotypes are sometimes observed in the interspecific hybrids induced by epistatic interaction between the AB and D genomes. The objective of the present study is confirmation of increased disease resistance in synthetic hexaploids showing weak phenotype of hybrid weakness. The results revealed that the enhanced disease resistance was significantly observed in the synthetic wheat lines with weak hybrid chlorosis, although no significant difference was found between the weak hybrid chlorosis-exhibiting plants and wild-type plants in the F_2 population between the normal and hybrid chlorosis lines of synthetic wheat. These observations suggested that trade-off could be established between increase in disease resistance and inhibition of plant growth vigor, and that weak allele for the hybrid chlorosis is available for wheat breeding to produce enhanced disease-resistance varieties.
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