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Kim, Hoy-Taek,Moriya, Shigeki,Okada, Kazuma,Abe, Kazuyuki,Park, Jong-In,Yamamoto, Toshiya,Nou, Ill-Sup The Korean Society of Plant Biotechnology 2016 식물생명공학회지 Vol.43 No.1
We isolated and confirmed two S-RNases, denoted as mpS1 and mpS2, from apple rootstock 'Marubakaido' (Malus prunifolia Borkh. Var. ringo Asami). These S-RNases contained and conserved five cysteine residues and two histidine residues, which are essential for RNase activity. The mpS1 showed high similarity to S5 (99.1%) of Malus spectabilis, whereas the mpS2 showed 99.5% nucleotide sequence similarity to S26 of (Malus ${\times}$ domestica) and 99.6% to S35 of (Malus sieversii) when compared with reported S-RNases. In amino acid sequences, the mpS1-RNase was almost similar to the S5-RNase of Malus spectabilis, and the mpS2-RNase was similar to the S35 of Malus sieversii, with only one bp being different from the S26-RNase of Malus ${\times}$ domestica. The 57 S-RNases of Malus species were renamed and rearranged containing the new S-RNases, as mprpS35 (mpS2) and mprpS57 (mpS1), for determining S-genotypes and identifying new alleles from apple species (Malus spp.).
Kim, Hoy-Taek,Nou, Ill-Sup Korean Society of Horticultural Science 2016 원예과학기술지 Vol.34 No.3
The parentage of the horticulturally important pear cultivar 'Niitaka' was confirmed by determining its S-genotypes based on the S-RNase and $PpSFBB^{-{\gamma}}$ genes, and genotyping using simple sequence repeat (SSR) markers. Previous reports suggested that the cultivars 'Amanogawa' and 'Imamuraaki' were the parents of 'Niitaka', although the cultivars 'Chojuro' and 'Shinchu' were also examined as candidate parents, along with two other cultivars. In the present study, the S-genotype of 'Niitaka' was determined to be $S^3S^9$. The $S^9$-RNase of 'Niitaka' was found to be likely inherited from the parent 'Amanogawa' ($S^1S^9$) and the $S^3$-RNase from 'Chojuro' ($S^3S^5$) or 'Shinchu' ($S^3S^5$). Based on the S-genotypes, the cultivar 'Imamuraaki' ($S^1S^6$) had no contribution to the parentage of 'Niitaka' ($S^3S^9$). A total of 67 polymorphic SSR markers were used to further confirm the parentage of 'Niitaka'. Discrepancies were found at several SSR loci between 'Niitaka' and the cultivars 'Imamuraaki' and 'Shinchu', whereas 'Niitaka' inherited alleles from 'Amanogawa' and 'Chojuro' at all SSR loci. Therefore, our findings established that 'Amanogawa' and 'Chojuro' are the parents of pear cultivar 'Niitaka', and not 'Imamuraaki' as previously reported.
Hoy-Taek Kim,Ill-Sup Nou 한국원예학회 2016 원예과학기술지 Vol.34 No.3
The parentage of the horticulturally important pear cultivar ‘Niitaka’ was confirmed by determining its S -genotypes based on the S-RNase and PpSFBB-γ genes, and genotyping using simple sequence repeat (SSR) markers. Previous reports suggested that the cultivars ‘Amanogawa’ and ‘Imamuraaki’ were the parents of ‘Niitaka’, although the cultivars ‘Chojuro’ and ‘Shinchu’ were also examined as candidate parents, along with two other cultivars. In the present study, the S -genotype of ‘Niitaka’ was determined to be S³S⁹. The S⁹-RNase of ‘Niitaka’ was found to be likely inherited from the parent ‘Amanogawa’ (S¹S⁹) and the S³-RNase from ‘Chojuro’ (S³S⁵) or ‘Shinchu’ (S³S⁵). Based on the S-genotypes, the cultivar ‘Imamuraaki’ (S¹S⁶) had no contribution to the parentage of ‘Niitaka’ (S³S⁹). A total of 67 polymorphic SSR markers were used to further confirm the parentage of ‘Niitaka’. Discrepancies were found at several SSR loci between ‘Niitaka’ and the cultivars ‘Imamuraaki’ and ‘Shinchu’, whereas ‘Niitaka’ inherited alleles from ‘Amanogawa’ and ‘Chojuro’ at all SSR loci. Therefore, our findings established that ‘Amanogawa’ and ‘Chojuro’ are the parents of pear cultivar ‘Niitaka’, and not ‘Imamuraaki’ as previously reported.
Identification of a New Race and Development of DNA Markers Associated with Powdery Mildew in Melon
( Hoy Taek Kim ),( Jong In Park ),( Arif Hasan Khan Robin ),( Tomoko Ishikawa ),( Maki Kuzuya ),( Manabu Horii ),( Katsutoshi Yashiro ),( Ill Sup Nou ) 한국육종학회 2016 Plant Breeding and Biotechnology Vol.4 No.2
Powdery mildew disease caused by an obligatory parasitic fungus Podosphaera xanthii is a serious problem of melon (Cucumis melo L.) production worldwide. Severity of problem is further associated with emergence of new races over the years. In this study a new race of powdery mildew fungus was discovered from Ibaraki, Japan. The race was different from all other existing races of P. xanthii occurring in Japan. Phenotypic and genetic analysis established the new fungus type as a new race, N5. Ten melon lines were infected with a total of eight fungal races including the new N5 race and it was found that all melon lines had different disease reactions against the new race compared to other seven races. Only four melon genotypes were found resistant out of 42 commercial cultivars and lines were tested. Disease reactions of two sets of F2 populations and one set of backcross population revealed that two separate epistatic gene loci located in two different linkage groups (LG), LG II and LG XII, interact together for the resistant or susceptible reaction of melon lines. A total of six simple sequence repeat (SSR) markers were found polymorphic in melon lines out of 16 tested in response to N5 race. Two different sets of F2 populations between resistant and susceptible melon lines were assessed with two polymorphic SSR markers located in two different groups, LG II and LG XII. SSR genotyping yielded 78% and 94% expected polymerase chain reaction fragments in favor of resistance or susceptibility of F2 populations of CM17187×PMR5 and PMR45×PMR5 of melon lines, respectively.