Abstract
DNA markers that allow for identification of resistance genes in rice germplasm have a great advantage in resistance breeding because they can assess the existence of the genes without laborious inoculation tests. Functional markers (FMs), which are designed from functional polymorphisms within the sequence of genes, are unaffected by nonfunctional allelic variation and make it possible to identify an individual gene. We previously showed that the resistance function of the rice blast resistance gene Pit in a resistant cultivar, K59, was mainly acquired by up-regulated promoter activity through the insertion of a long terminal repeat (LTR) retrotransposon upstream of Pit. Here, we developed PCR-based DNA markers derived from the LTR-retrotransposon sequence and used these markers to screen worldwide accessions of rice germplasm. We identified 5 cultivars with the LTR-retrotransposon insertion out of 68 rice accessions. The sequence and expression pattern of Pit in the five cultivars were the same as those in K59 and all showed Pit-mediated blast resistance. The results suggest that the functional Pit identified using the markers was derived from a common progenitor. Additionally, comparison of the Pit coding sequences between K59 and susceptible cultivars revealed that one nucleotide polymorphism, which caused an amino acid substitution, offered another target for a FM. These results indicate that our DNA markers should enhance prediction of Pit function and be applicable to a range of rice varieties/landraces cultivated in various regions worldwide and belonging to the temperate japonica, tropical japonica, and indica groups.
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Acknowledgments
We thank Dr. T. Ashizawa and Dr. T. Nakajima for providing M. oryzae strains, and staff of our lab for their generous support. This work was partially supported by a Grant-in-Aid for Young Scientists (B) from the Ministry of Education, Culture, Sports, Science and Technology of Japan (21780009 to K. H.).
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Communicated by L. Xiong.
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Supplemental Fig. 1
DNA polymorphisms and the sequencing peak figures in the Pit coding region of K59, Senshou and Tadukan. Open box at the top shows the coding region of Pit. The structural signatures of Pit are shown in the upper region of the figure. The numbers of the upper parts in panels indicate the positions of nucleotide substitutions. A hyphen positioned at the 1284th nucleotide shows a deletion mutation. Arrows indicate the peak that occurred for nucleotide substitutions or deletion mutations (TIFF 6902 kb)
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Hayashi, K., Yasuda, N., Fujita, Y. et al. Identification of the blast resistance gene Pit in rice cultivars using functional markers. Theor Appl Genet 121, 1357–1367 (2010). https://doi.org/10.1007/s00122-010-1393-7
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DOI: https://doi.org/10.1007/s00122-010-1393-7