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Evaluation of Iron and Zinc Content in Rice Germplasms
Jeom-Ho Lee,Kyu-Seong Lee,Hung-Goo Hwang,Chang-Ihn Yang,Sang-Bok Lee,Young-Hwan Choi,O-Young Jeong,Parminder Virk 한국육종학회 2008 한국육종학회지 Vol.40 No.2
The germplasm of 246 rice cultivars was analysed for iron and zinc contents using a Inductively Coupled Argon Plasma (ICP) at International Rice Research Institute (IRRI) Philippines. Iron contents ranged from 2.0 to 12.0, and zinc ranged from 10.0 to 33.0 (mg/kg), showing with the mean values of 4.3 and 22.8 (mg/kg), respectively. In genotypes tested, there was approximately a two-fold difference in iron and zinc concentrations, suggesting a genetic potential to increase these micronutrients in rice grain. A highly significant positive correlation (r2=0.503) was found between iron and zinc contents. Iron contents decreased drastically as polishing time increased, whereas zinc decreased only slightly. In the interaction between genotype and environment on iron contents, genotype (G), environment (E), and the G × E interactions accounted for 69%, 5% and 26% of the sums of squares, respectively. Indicating that genotype is would be the most significant factor for the to improve iron contents of rice in rice breeding, suggesting that therefore identifying genotypes with relatively stable performance across various environments is important as staple food crops.
Lee, Jeom Kyu,Lee, Yeong Seon,Park, Yong Keun,Kim, Bong Su Center for Academic Publications Japan 2005 Microbiology and immunology Vol.49 No.7
<P>Mutation with Ser-83-->Leu in gyrA gene was associated with the principal mutation for ciprofloxacin resistance in clinical isolates of Acinetobacter baumannii. Double mutation, Ser-83-->Leu in gyrA gene and Ser-80-->Leu in parC gene, was the most frequently detected among ciprofloxacin-resistant isolates. A novel mutation with Ser-80-->Trp in parC gene, in addition to mutation in gyrA gene, was associated with a high-level ciprofloxacin resistance. These results suggested that the presence of an additional mutation in the parC gene contributed to a higher-level of ciprofloxacin resistance than a single mutation in the gyrA gene (geometric mean MICs of ciprofloxacin, 44.1 versus 16 microg/ml, P < 0.05).</P>
Lee, Jeom Kyu,Lee, Yeong Seon,Park, Yong Keun,Kim, Bong Su Elsevier 2005 INTERNATIONAL JOURNAL OF ANTIMICROBIAL AGENTS Vol.25 No.4
<P><B>Abstract</B></P><P>The presence of fluoroquinolone resistance-associated alterations in topoisomerase II and IV were investigated for 103 <I>nfxC</I>-like type <I>Pseudomonas aeruginosa</I> isolates. The most <I>nfxC</I>-like type isolates (98.1%) possessed the substitution of Ile for Thr-83 in GyrA. A single alteration in GyrA (Thr-83→Ile) was the most frequently detected and the next common alteration was two alterations with Thr-83→Ile in GyrA and Ser-87→Leu in ParC. A novel alteration at position Glin-106 of GyrA, which was suggested to be responsible for fluoroquinolone resistance, was identified. Our study revealed that the alterations in GyrB (Glu-468→Asp) and in ParE (Asp-419→Asn or Glu-459→Asp) play a complementary role in the acquisition of resistance to fluoroquinolone. There was a correlation between the ciprofloxacin MIC and the number of resistance-associated alterations in GyrA, GyrB, ParC and ParE of <I>P. aeruginosa</I> isolates.</P>
Genotypic Differences in Nitrogen Uptake and Utilization for Grain Yield of Rice
Myung-Kyu Oh,Myeong-Ki Kim,Min-Kyu Choi,Im-Soo Choi,Young-Chan Cho,Yeon-Gyu Kim,Jeom-Ho Lee,Young-Tae Lee 한국육종학회 2005 한국육종학회지 Vol.37 No.5
A field experiment was conducted to investigate the variation of nitrogen(N) use eficiency, nitrogen uptake efficiency,and their relationships with grain yield in 34 rice genotypes. Significant diferences among genotypes were observed in grain yield,N uptake, total dry matter (TDM), and harvest index (HI). The N-eficient genotypes that produced high grain yield at both lowand standard levels of N were, Ilpumbyeo(MNU)77-GH1-3, Ilpumbyeo, and SR19616-2B-34-3. Inefficient genotypes that pro-genotypes giving low yields at both and standard levels. Increase in grain yield was highly correlated with N uptake (r2 = 0.65***)and TDM was also similarly correlated with N uptake. The grain yield-N uptake relationship for individual genotypes indicatedsignificant diference in slope and in the yield obtained with soil N (GY0). Differences in GY0 were due to genotypic variation inN uptake and efficiency of use. HI was related to both grain yield and TDM.