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Phenotypic and molecular evaluation of cotton hairy roots as a model system for studying nematode resistance

机译:棉花毛状根的表型和分子评价作为研究线虫抗性的模型系统

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Agrobacterium rhizogenes-induced cotton (Gossypium hirsutum L.) hairy roots were evaluated as a model system for studying molecular cotton-nematode interactions. Hairy root cultures were developed from the root-knot nematode (RKN) (Meloidogyne incognita [Kofoid and White] Chitwood, race 3)-resistant breeding line M315 and from the reniform nematode (RN) (Rotylenchulus reniformis Linford '' Oliveira)-resistant accession GB713 (G. barbadense L.) and compared to a nematode-susceptible culture derived from the obsolete cultivar DPL90. M315, GB713, and DPL90 hairy roots differed significantly in their appearance and growth potential; however, these differences were not correlated with transcript levels of the A. rhizogenes T-DNA genes rolB and aux2 which help regulate hairy root initiation and proliferation. DPL90 hairy roots were found to support both RKN and RN reproduction in tissue culture, whereas M315 and GB713 hairy roots were resistant to RKN and RN, respectively. M315 hairy roots showed constitutive up-regulation of the defense gene MIC3 (Meloidogyne Induced Cotton3) compared to M315 whole-plant roots and DPL90 hairy roots. Our data show the potential use of cotton hairy roots in maintaining monoxenic RKN and RN cultures and suggest hairy roots may be useful in evaluating the effect of manipulated host gene expression on nematode resistance in cotton.
机译:评价发根农杆菌诱导的棉花(棉(Gossypium hirsutum L.))的毛状根作为研究分子棉-线虫相互作用的模型系统。从抗根结线虫(RKN)(Meloidogyne incognita [Kofoid and White] Chitwood,第3种族)抗性繁殖系M315和肾形线虫(RN)(Rotylenchulus reniformis Linford” Oliveira)抗性发展出毛状根培养物。加入GB713(G. barbadense L.),并与源自过时品种DPL90的线虫敏感培养物进行比较。 M315,GB713和DPL90毛状根的外观和生长潜力存在显着差异。但是,这些差异与发根农杆菌T-DNA基因rolB和aux2的转录水平无关,后者有助于调节毛根的起始和增殖。发现DPL90毛状根支持组织培养中的RKN和RN繁殖,而M315和GB713毛状根分别对RKN和RN具有抗性。与M315全株根和DPL90毛根相比,M315毛根显示防御基因MIC3(根结线虫诱导的Cotton3)的组成型上调。我们的数据显示了棉毛根在维持单亲性RKN和RN培养物中的潜在用途,并暗示了毛根在评估操纵宿主基因表达对棉花线虫抗性的影响中可能有用。

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