A major issue in rice production is the control of Pyricularia oryzae, the causal agent of rice blast. Genotypes with R resistant leucine-rich repeat genes control specific races of the parasite. However, the resistance is overcome by the pathogen, over a sufficiently long time. In temperate areas, current cultivated varieties have a largely insufficient field resistance. This prompted us to undertake the pyramiding of the R resistance genes Pib, Piz, Pik, Pita2, and Piz-t in temperate japonica materials. Two lines were produced, SJKK and SJKT-2, that have each four pyramided genes. They are fully resistant to rice blast when tested in the field and in greenhouse. However, the tropical origin of the R donor genotypes added complexity to the pyramiding exercise. The results point to a lack of fitness costs in pyramided lines.
Blast resistance R genes pyramiding in temperate japonica rice / C.M. Pozzi, G. Orasen, E. Puja, M.R. Stile, R. Greco. - In: EUPHYTICA. - ISSN 0014-2336. - 216:3(2020 Mar 01). [10.1007/s10681-020-2575-2]
Blast resistance R genes pyramiding in temperate japonica rice
C.M. Pozzi
Primo
;G. OrasenSecondo
;R. GrecoUltimo
2020
Abstract
A major issue in rice production is the control of Pyricularia oryzae, the causal agent of rice blast. Genotypes with R resistant leucine-rich repeat genes control specific races of the parasite. However, the resistance is overcome by the pathogen, over a sufficiently long time. In temperate areas, current cultivated varieties have a largely insufficient field resistance. This prompted us to undertake the pyramiding of the R resistance genes Pib, Piz, Pik, Pita2, and Piz-t in temperate japonica materials. Two lines were produced, SJKK and SJKT-2, that have each four pyramided genes. They are fully resistant to rice blast when tested in the field and in greenhouse. However, the tropical origin of the R donor genotypes added complexity to the pyramiding exercise. The results point to a lack of fitness costs in pyramided lines.File | Dimensione | Formato | |
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EUPH-D-19-00545_R1 (2).pdf
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Orasen2020_Article_BlastResistanceRGenesPyramidin.pdf
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