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首页> 外文OA文献 >Carrageenans, sulphated polysaccharides of red seaweeds, differentially affect arabidopsis thaliana resistance to trichoplusia ni (Cabbage Looper)
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Carrageenans, sulphated polysaccharides of red seaweeds, differentially affect arabidopsis thaliana resistance to trichoplusia ni (Cabbage Looper)

机译：角叉菜胶，红海藻的硫酸多糖，差异地影响拟南芥对毛滴虫的抗性（卷心菜）

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Carrageenans are a collective family of linear, sulphated galactans found in a number of commercially important species of marine red alga. These polysaccharides are known to elicit defense responses in plant and animals and possess anti-viral properties. We investigated the effect of foliar application of \u3b9-, \u3ba- and \u3bb-carrageenans (representing various levels of sulphation) on Arabidopsis thaliana in resistance to the generalist insect Trichoplusia ni (cabbage looper) which is known to cause serious economic losses in crop plants. Plants treated with \u3b9- and \u3ba-carrageenan showed reduced leaf damage, whereas those treated with \u3bb-carrageenan were similar to that of the control. In a no-choice test, larval weight was reduced by more than 20% in \u3b9- and \u3ba- carrageenan treatments, but unaffected by \u3bb-carrageenan. In multiple choice tests, carrageenan treated plants attracted fewer T. ni larvae by the fourth day following infestation as compared to the control. The application of carrageenans did not affect oviposition behaviour of T. ni. Growth of T. ni feeding on an artificial diet amended with carrageenans was not different from that fed with untreated control diet. \u3b9-carrageenan induced the expression of defense genes; PR1, PDF1.2, and TI1, but \u3ba- and \u3bb-carrageenans did not. Besides PR1, PDF1.2, and TI1, the indole glucosinolate biosynthesis genes CYP79B2, CYP83B1 and glucosinolate hydrolysing QTL, ESM1 were up-regulated by i-carrageenan treatment at 48 h post infestation. Gas chromatography-mass spectrometry analysis of carrageenan treated leaves showed increased concentrations of both isothiocyanates and nitriles. Taken together, these results show that carrageenans have differential effects on Arabidopsis resistance to T. ni and that the degree of sulphation of the polysaccharide chain may well mediate this effect.
机译：角叉菜胶是线性的，硫酸化的半乳聚糖的集体家族，存在于许多商业上重要的海洋红藻物种中。已知这些多糖在植物和动物中引起防御反应，并具有抗病毒特性。我们研究了叶面施用\ u3b9-，\ u3ba-和\ u3bb-卡拉胶（代表各种硫酸盐水平）对拟南芥对普通昆虫Trichoplusia ni（白菜弯loop）的抵抗力的影响。在农作物中。用\ u3b9-和\ u3ba-角叉菜胶处理的植物显示出减少的叶片损伤，而用\ u3bb-角叉菜胶处理的植物与对照相似。在一项无选择的测试中，在\ u3b9-和\ u3ba-角叉菜胶治疗中，幼虫体重减少了20％以上，但不受\ u3bb-角叉菜胶的影响。在多项选择测试中，与对照相比，在受到侵染后第四天，用角叉菜胶处理过的植物吸引了较少的T. ni幼虫。角叉菜胶的施用不影响丁香木的产卵行为。饲喂角叉菜胶的人工饲料饲喂的三叶草的生长与未经处理的对照饲料饲喂的三叶草的生长无差异。 \ u3b9-角叉菜胶诱导防御基因的表达； PR1，PDF1.2和TI1，但\ u3ba-和\ u3bb-卡拉胶没有。除PR1，PDF1.2和TI1外，在侵染后48小时，i-角叉菜胶处理还上调了吲哚芥子油苷生物合成基因CYP79B2，CYP83B1和芥子油苷水解QTL，ESM1。角叉菜胶处理过的叶片的气相色谱-质谱分析表明，异硫氰酸盐和腈的浓度均增加。综上所述，这些结果表明角叉菜胶对拟南芥对烟草的抗性具有不同的作用，并且多糖链的硫酸化程度可以很好地介导该作用。

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