• Title, Summary, Keyword: Oryza sativa L

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Changes in SPAD Value and Phothosynthetic Rate during Grain Filling of Oryza glaberrima Strains and Oryza sativa Cultivars (Oryza glaberrima 계통과 Oryza sativa 품종의 등숙기간중 SPAD치와 광합성속도의 변화)

  • 윤영환
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.42 no.6
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    • pp.759-765
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    • 1997
  • The process of the senescence in Oryza glaberrima Steud. strains and Oryza sativa L. cultivars were examined in terms of SPAD value(chlorophyll content) and photosynthetic rate. SPAD values and photosynthetic rates of flag leaves for 10 genotypes of each species was measured at the 1, 3 and 5 weeks after heading. SPAD values and photosynthetic rates of O. glaberrima strains tended to decrease rapidly after heading. O. sativa cultivars showed slower decrease as compared to O. glaberrima strains, in particular during the period from 1 to 3 weeks after heading. Although there was no significant difference between the two species in the mean value of photosynthetic rate and SPAD value at 1 weeks after heading, O. glaberrima had lower values after 3 weeks after heading. There were significant positive correlation coefficients between the photosynthetic rate and the SPAD value at 1 and 3 weeks after heading for O. glaberrima strains, and at 1 and 5 weeks after heading for O. sativa cultivars. There were significant positive correlation between the decreasing rates of the photosynthetic rates and the decreasing rates of the SPAD values at the period from the 1 to 3 weeks after heading for both species. At the period from 3 to 5 weeks after heading, only O. glaberrima showed a significant correlation between two traits, indicating that rapid decrease in chlorophyll content would affect the photosynthesis in O. glaberrima.

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A Quinolone Alkaloid, from the Aleurone Layer of Oryza sativa cv. Mihyangbyo, Inhibits Growth of Cultured Human Leukemia Cell

  • Chung, Ha-Sook
    • Preventive Nutrition and Food Science
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    • v.7 no.2
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    • pp.119-122
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    • 2002
  • Oryza sativa cv. Mihyangbyo is one of several recently developed varieties of rice; characterized by high levels of aromatic components, which may increase its sensory and nutritional properties. In conjunction with our continuing investigation of bioactive components of improved grain varieties, a quinolone alkaloid was isolated from the n-butanol soluble fraction of the aleurone layer of Oryza sativa cv. Mihyangbyo (Gramineae) through activity-guided fractionation and isolation. The compound exhibited moderate antineoplastic activity in a human leukemia cell line (U937) with an $IC_{50}$/ value of 118.1 ug/mL, based on the MTT(3-[4, 5]dimethylthiazol-2-yl]-2, 5-diphenyltetrazolium bromide) cell proliferation assay. The chemical structure of the functional compound was determined, based on physical and spectroscopic characteristics.

Isolation and Identification of Adenosine and Phlomuroside from the Aerial Parts of Oryza sativa L. (벼(Oryza sativa L.)의 지상부로부터 adenosine과 phlomuroside의 분리 및 동정)

  • Jeong, Rak-Hun;Lee, Dae-Young;Cho, Jin-Gyeong;Baek, Yoon-Su;Seo, Kyeong-Hwa;Lee, Dong-Geol;Kang, Hee-Cheol;Kim, Ji-Young;Baek, Nam-In
    • Journal of Applied Biological Chemistry
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    • v.57 no.4
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    • pp.321-324
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    • 2014
  • Fresh and chopped aerial parts of Oryza sativa were extracted in 80% aqueous mehthanol, and the concentrated extract was successively partitioned in n-hexane, ethyl acetate (EtOAc), n-butanol (n-BuOH), and $H_2O$ fractions. From the n-BuOH fraction, two compounds were isolated through repeated silica gel and ODS column chromatography (c.c.). Based on nuclear magnetic resonance (NMR), mass spectrometry and infrared spectroscopy spectroscopic data, the compounds were identified to be adenosine (1) and phlomuroside (2). Especially, the configuration of both the anomer hydroxyl groups was determined as ${\beta}$ from the coupling constants of the anomer protons (J =6.0 and 7.6 Hz) in the $^1H-NMR$ spectra. This is the first report for the isolation of these compounds from Oryza sativa L.

Antioxidant Compounds of Oryza sativa L (벼의 항산화성분)

  • Min, Byung-Sun;Lee, Hyeong-Kyu;Zee, Ok-Pyo;Moon, Hyung-In
    • Korean Journal of Pharmacognosy
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    • v.33 no.3
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    • pp.173-176
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    • 2002
  • In search for the plant-derived antioxidant compound, it was found that the EtOAc, BuOH extracts obtained from the leaves parts of Oryza sativa L. which exhibited a significant antioxidant activity from 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical cleavage. Activity-guided fractionation on the basis of the inhibitory activity upon the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical cleavage. and repeated column chromatography afforded several antioxidant compounds from Oryza sativa L. The structures and stereochemistry of these compounds were established on the basis of analysis of spectra and some chemical transformations as follows: 5,7-dihydroxy- 8-methoxyflavone, $acacetin-7-O-{\beta}-rutinoside$, $pectolinarigenin-7-O-{\beta}-rutinoside$. At antioxidant activity test for isolated three compounds, antioxidant activity was showed too.

Morphological Characters of Panicle and Seed Mutants of Rice

  • Kang Sang-Gu;Pandeya Devendra;Kim Sung-Soo;Suh Hak-Soo
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.51 no.4
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    • pp.348-355
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    • 2006
  • Phenotypes of panicle, hull and seed of mutant rice (Oryza sativa L.) were characterized. Panicle mutants were classified in 4 groups with their internode length of main rachis, primary rachis, secondary rachis and pedicel. Hull and seed mutants were grouped into 12 based on their mutant characters in shape, size and color of seeds. These natural and spontaneous mutant collections showed distinct phenotypes to wild type rice. This might be useful for the identification of the functions of genetic factors in the Mendelian inheritance.

The Effect of Ginseng Saponin Fraction on the Germination and Early Growth of Rice Seed (Oryza sativa L.) (인삼사포닌이 벼의 발아 및 초기 생장에 미치는 영향)

  • 이용우;주충노
    • Journal of Ginseng Research
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    • v.11 no.1
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    • pp.77-83
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    • 1987
  • The effects of ginseng saponin on the germination and early growth of rice seeds (Oryza sativa L.) were investigated. The early growth (length) of test rice seeds which were rinsed for 60 hrs in $10^{-4}$% saponin solution prior to transplantation to water agar bed was about 20% faster than that of control seeds, It was also found that the amylase activity of the seeds was most active when the seeds were rinsed in 10-4% saponin solution for 48 hrs. In vitro investigation showed that the amylase activities were stimulated about 30% by the treatment of $10^{-5}$% saponin solution compared with control group. From the above results, it seems that the ginseng saponin might activate amylase of rice seed during germination, resulting in rapid growth of rice.

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Screening of Gravity Inducible cDNAs in Rice(Oryza sativa L.) Cultured Cell (벼 (Oryza sativa L.)배양세포의 고중력유도성 cDNA의 탐색)

  • ;;Kiyoharu OONO
    • Korean Journal of Plant Tissue Culture
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    • v.21 no.2
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    • pp.111-115
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    • 1994
  • Two different gravity specific cDNA, namely, GSC 13 and GSC 124 with length of 1.34 and 0.67 kilobase pairs, and transcripts of 2.0 and 1.9 kilobase pairs, respectively. were isolated by differential screening and northern hybridization of the total RNA isolated from treated and untreated cultured cells showed that maximum levels of trannscripts were achieved after 4 h of gravity stress at 450, 000 x g for both, GSC 13 and GSC 124, suggesting that these mRNA could be expressed and translated into polyeptites related to the cell to extream gravity stress.

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