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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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Limitation of genetic diversity in japonica rice breeding populations is often identified as a potential obstacle for the development of high yielding cultivars. The use of diverse germplasm in rice breeding has been suggested as one way of combating this problem. This study was conducted to improve the genetic diversity for rice, by developing an advanced backcross population derived from a backcross ‘Junam’ as recurrent parent and ‘IR72’ as a donor parent. Among them, we selected a promising line ‘YR24438-B-B-B-B-132’ containing bacterial blight resistance gene Xa4. Testing in the replicated yield trial in 2009, the ‘YR24438-B-B-B-B-132’ line was selected, and it was designated as ‘Milyang298’. The local adaptability test of ‘Milyang298’ was carried out at three locations from 2014 to 2016 and it was named ‘MY298BB’. The average culm length in the replicated yield trials was 87 cm, which is 15 cm taller than recurrent parent ‘Junam’. Number of spikelets per panicle was significantly lower than in ‘Junam’ but the number of tillers per hill was higher. This variety is resistant to bacterial blight race K1, K2, K3, and K3a.However ‘MY298BB’ showed early leaf senescence at the mature stage and the chlorophyll content of ‘MY298BB’ was significantly lower than that of the recurrent parent ‘Junam’. Moreover the grain filling ratio and yield were significantly lower in ‘MY298BB’ than those of recurrent parent ‘Junam’. Therefore, understanding the leaf senescence mechanism would be useful for improving yield potential in rice.
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참고문헌 (16)
참고문헌 신청
Ebitani T / 2005 / Construction and evaluation of chromosome segment substitution lines carrying overlapping chromosome segments of indica rice cultivar ‘Kasalath’ in a genetic background of japonica elite cultivar ‘Koshihikari’ / Korean J Breed Sci 55:65~73
Harushima Y / 2002 / Diverse variation of reproductive barriers in three intraspecific rice crosses / Genetics 60:312~322
Hur YJ / 2016 / Pyramiding of two rice bacterial blight resistance genes, Xa3 and Xa4, and a closely linked cold-tolerance QTL on chromosome 11 / Theor Appl Genet 129:1861~1871
Ishikawa S / 2005 / Chromosomal regions with quantitative trait loci controlling cadmium concentration in brown rice(Oryza sativa L. ) / New Phytol 168:345~350
Jena KK / 2000 / Rice breeding and genetic: research priorities and challenges / Science Publ :269~284
Harushima Y / 2002 / Diverse variation of reproductive barriers in three intraspecific rice crosses / Genetics 60:312~322
Hur YJ / 2016 / Pyramiding of two rice bacterial blight resistance genes, Xa3 and Xa4, and a closely linked cold-tolerance QTL on chromosome 11 / Theor Appl Genet 129:1861~1871
Ishikawa S / 2005 / Chromosomal regions with quantitative trait loci controlling cadmium concentration in brown rice(Oryza sativa L. ) / New Phytol 168:345~350
Jena KK / 2000 / Rice breeding and genetic: research priorities and challenges / Science Publ :269~284
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