• Title/Summary/Keyword: sunflower root exudates

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Allelopathic Activity and Determination of Allelochemicals from Sunflower (Helianthus annuus L.) Root Exudates - 1. Allelopathic and Autotoxic Effects of Sunflower Root Exudates (해바라기(Helianthus annuus L.) 근분비물질(根分泌物質)의 타감작용(他感作用) 및 타감물질(他感物質)의 동정(同定) - 1. 해바라기 근분비물질(根分泌物質)의 타감작용(他感作用) 및 자가억제작용(自家抑制作用))

  • Park, K.H.;Moody, K.;Kim, S.C.;Kim, K.U.
    • Korean Journal of Weed Science
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    • v.12 no.1
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    • pp.52-60
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    • 1992

  • There was no significant difference in the final germination percentages(Experiment 1-3) as affected by sunflower root exudates between the control and the treated for the test species. In general(Experiment 1), however, germination onset was delayed the treated bottles. Germination rate was, also, reduced for both radish(Raphanus sativus L.) and rice(Oryza sativa L.). Therefore, the germination index was low in the treated bottles but germination gradually increased with time in the greated bottles in all test species so that the final germination percentages were similar between treatments. The root exudates of sunflower had significant inhibitory effects(Experiment 1-3) on the lengths of the shoots and roots of all the test species. Fresh weight was also significantly reduced in all test species. Sunflower seedlings(Experiment 3) in the treated(with the XAD-4 resin column) were larger and healthier than those in the control (without XAD-4 resin column) because of the removal of allelochemicals. The fresh weight of sunflower seedlings was markedly inhibited by sunflower root exudates. These mean that sunflower probably is an autotoxic crop.

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Allelopathic Activity and Determination of Allelochemicals from Sunflower (Helianthus annuus L.) Root Exudates II. Elucidation of Allelochemicals from Sunflower Root Exudates (해바라기(Helianthus annuus L.) 근분비물질(根分泌物質)의 타감작용(他感作用) 및 타감물질(他感物質)의 동정(同定) II. 타감성(他感性) 해바라기 근분비물질(根分泌物質)의 동정(同定))

  • Park, K.H.;Moody, K.;Kim, S.C.;Kim, K.U.
    • Korean Journal of Weed Science
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    • v.12 no.2
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    • pp.173-182
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    • 1992

  • Regardless of the test species, germination was adversely affected by the different concentrations of the acidic and neutral fractions of sunflower root exudates while the basic and aqueous fractions had no effect on germination. In both test species, root lengths were inhibited slightly more than shoot lengths. Significant reduction in fresh weights of the test species was observed when the test species were treated with the acidic and neutral fractions but not with the basic and aqueous fractions. Six compounds, hydroquinone, ${\beta}$-resorcyclic acid, vanillic acid, caffeic acid, salicylic acid, and quercetin, were characterized from the acidic fraction. Seven compounds, hydroquinone, gentisic acid, ${\beta}$-resorcyclic acid, vanillic acid, caffeic acid, ferulic acid, and quercetin, were elucidated from the neutral fraction.

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