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首页> 外文期刊>African Journal of Biotechnology >Cloning and characterization of NBS-LRR resistance gene analogues of Musa spp. and their expression profiling studies against Pratylenchus coffeae
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Cloning and characterization of NBS-LRR resistance gene analogues of Musa spp. and their expression profiling studies against Pratylenchus coffeae

机译:芭蕉属NBS-LRR抗性基因类似物的克隆与鉴定。及其对咖啡草的表达谱研究

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摘要

Resistance gene analogues (RGAs) were isolated from two banana cultivars viz., Karthobiumtham and Rose using degernate primers designed from the conserved motifs of different plant resistance genes. A total of 40 sequences were hit with various R genes, of which 20 sequences were having uninterrupted open reading frame (ORFs). Based on the conserved domains like P loop, internal kinase 2, kinase 3a and hydrophobic domain motifs of the deduced amino acid sequences were grouped as NBS-LRR class of resistant genes. The phylogentic analysis of RGAs showed that all the?Musa?RGAs are grouped under non-TIR branch and grouped into six distinct?Musa?RGA cluster. To investigate the expression profile of the RGAs, specific primers were designed for one representative RGA from each RGA cluster and it was found that C1 and C5 were induced upon root lesion nematode infection in the resistant (cv. Karthobiumtham) and not in susceptible (cv.Nendran) cultivar. C6 was expressed only in resistant cultivar not in susceptible one.? But there was no change in the expression of C2 and C3 in both resistant and susceptible cultivars. These results indicate that in depth study on C1, and C5 RGAs will be helpful for further improvement of?P.?coffeae?resistance in banana.
机译:使用从不同植物抗性基因的保守基序设计的脱氢柠檬酸引物,从两个香蕉品种Karthobiumtham和Rose中分离出抗性基因类似物(RGA)。共有40个序列被各种R基因所击中,其中20个序列具有不间断的开放阅读框(ORF)。根据保守域如P环,推导的氨基酸序列的内部激酶2,激酶3a和疏水域基序被归类为NBS-LRR类抗性基因。 RGA的系统发育分析表明,所有的“ Musa” RGAs都归类于非TIR分支下,并分为六个不同的“ Musa” RGA簇。为了研究RGA的表达谱,为每个RGA簇中的一个代表性RGA设计了特异性引物,发现在根瘤线虫感染后,抗药性(cv。Karthobiumtham)和不易感性(cv)诱导了C1和C5 (Nendran)品种。 C6仅在抗性品种中表达而不在易感品种中表达。但是在抗性和易感品种中C2和C3的表达均没有变化。这些结果表明,对C1和C5 RGA的深入研究将有助于进一步提高香蕉的抗P.coffeae的能力。

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