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RISS 인기검색어
- 검색키워드
- 저자 : Hisashi Kato-Noguchi (검색결과 5 건)
- 무료
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Effect of the D-glucose analog, D-allose, on the growth of Arabidopsis roots
Kato-Noguchi, Hisashi,Takaoka, Takuya,Okada, Kozue The Korean Society of Weed Science and The Turfgra 2011 Weed Biology and Management Vol.11 No.1
Although D-glucose increased the root growth of Arabidopsis seedlings, D-allose (a d-glucose epimer at the third carbon atom) inhibited the root growth at concentrations >0.1 $mmol\;L^{-1}$ and the inhibition increased with increasing D-allose concentrations. Allitol (a reduction product of D-allose) did not show any significant effect on the growth. The addition of D-glucose into the growth medium of Arabidopsis reversed the D-allose-induced growth inhibition, which suggests that the inhibition is not caused by the toxicity of the accumulation of D-allose and/or its metabolites in the seedlings. D-Allose is phosphorylated by hexokinase, using ATP and phosphate, to allose-6-phosphate, with no known capacity for further metabolism. The addition of phosphate into the growth medium did not affect the D-allose-induced growth inhibition and D-allose did not reduce the ATP level in the roots. These results suggest that the inhibition is not due to phosphate starvation and ATP depletion. D-Mannoheptulose, a specific competitive inhibitor of hexokinase, defeated the D-allose-induced growth inhibition. Hexokinase is known to have a sugar-sensing function and possibly triggers a signal cascade, resulting in the change of several gene expressions. Therefore, the phosphorylation of D-allose by hexokinase might trigger a signal cascade, resulting in the inhibition of Arabidopsis root growth. This is probably a useful model system for studies of the hexokinase-mediated sugar-sensing function and for developing new types of weed-control agents.
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Allelopathy of pine litter: Delivery of allelopathic substances into forest floor
Fukiko Kimura,Masashi Sato,Hisashi Kato-Noguchi 한국식물학회 2015 Journal of Plant Biology Vol.58 No.1
Red pine (Pinus densiflora Sieb. et Zucc.) forest forms sparse forest floor where herbaceous plants do not grow well. Allelopathic chemical interaction was speculated to play an important role in the formation of the forest floor. However, only several phenolic acids and their related compounds have been isolated from the forest floor. Those compounds are universal in many plants and cannot distinguish such strong allelopathic activity of red pine from other plants. The present research investigates whether red pine litter contains some potential allelopathic substances other than phenolics. Aqueous methanol extracts of red pine litter inhibited the growth of cress (Lepidium sativum) and Digitaria sanguinalis L., and increasing the extract concentration increased the inhibition. The extract was then purified by several chromatographies and biological activities of all separated fractions were determined. Two main inhibitory substances were finally isolated and their chemical structures were determined by spectral data as 9α,13β- epidioxyabeit-8(14)en-18-oic acid and abscisic acid-β-Dglucopyranosyl ester. These compounds may be synthesized in pine plants and delivered into the forest floor by defoliation of the needles. Their inhibitory activity on the germination and the growth may play an important role in the formation of the sparse forest floors.
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Md. Shafiqul Islam,Arihiro Iwasaki,Kiyotake Suenaga,Hisashi Kato-Noguchi 한국식물학회 2017 Journal of Plant Biology Vol.60 No.1
Organic agriculture emphasized using of biologically originated herbicides and phytotoxic substances are being considered as a replacement to chemical herbicides. Marsilea crenata is an aquatic perennial fern distributed in the South-East Asian countries and is well known for various biological properties. However, to date, there has been no report that addresses the phytotoxicity of Marsilea crenata. Therefore, we explored phytotoxic properties and phytotoxic substances from Marsilea crenata. An aqueous methanol extracts of Marsilea crenata showed inhibition on the seedling growth of cress, lettuce, alfalfa, barnyard grass, Italian ryegrass, and foxtail fescue. Inhibition increased with increasing extract concentration. The extract was purified by several chromatographic steps and two phytotoxic substances were isolated and identified by spectroscopic analysis as loliolide and isololiolide. At the concentration of 30 μM, loliolide and isololiolide inhibited seedling growth of cress and barnyard grass by 41.3 to 51.1%, and 58.15 to 87.5% of control seedlings, respectively. The concentrations required for 50% inhibition of cress and barnyard grass seedlings ranged from 32.1 to 128.5 μM for loliolide, 37.0 to 176.2 μM for isololiolide. These results suggest these compounds may be responsible for phytotoxic effects of Marsilea crenata extract and could be an important part of organic agriculture.
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