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首页> 外文期刊>Acta Horticulturae >Histopathological changes in banana roots caused by Pratylenchus coffeae, Meloidogyne incognita and Radopholus similis, and identification of RAPD markers associated with P. coffeae resistance.
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Histopathological changes in banana roots caused by Pratylenchus coffeae, Meloidogyne incognita and Radopholus similis, and identification of RAPD markers associated with P. coffeae resistance.

机译：桔梗，南方根结线虫和Ra​​d虫引起的香蕉根的组织病理学变化，以及鉴定与咖啡抗性相关的RAPD标记。

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摘要

Worldwide, nematodes are amongst the most important pests of banana. By damaging the root system, nematodes adversely affect the uptake of water and nutrients, the basic needs for plant growth and fruit production. Although phenolics in banana roots are formed in response to infection by various pathogens including nematodes, information on the nature of such compounds and their potential role in defence is scarce. 59 banana genotypes (10 diploids and 49 triploids) were infected with the root-lesion nematode Pratylenchus coffeae, the root-knot nematode Meloidogyne incognita and the burrowing nematode Radopholus similis in glasshouse experiments. The production of phenolic compounds in healthy and nematode-infected banana roots was investigated histochemically, and RAPD markers associated with nematode resistance were identified. Root histological studies revealed higher numbers of cells with phenols and lignified cells in resistant accessions ‘Karthobiumtham’ (ABB) and ‘Bhimkol’ (BB) compared to susceptible accessions ‘Therahaw-1164’ (ABB) and ‘Jahaji’ (AAA). RAPD analysis using arbitrary oligonucleotide primers differentiated resistant and susceptible banana genotypes. The marker bands found in the resistant accessions could be used to study the molecular basis for resistance to nematodes. Sequencing of these bands could help to establish the mechanism responsible for nematode resistance.
机译：在全世界，线虫是香蕉最重要的害虫之一。线虫通过破坏根系，对水和养分的吸收，植物生长和水果生产的基本需求产生不利影响。尽管香蕉根中的酚类化合物是响应各种病原体（包括线虫）的感染而形成的，但有关此类化合物的性质及其在防御中的潜在作用的信息仍然很少。在温室试验中，59种香蕉基因型（10种二倍体和49种三倍体）感染了根部线虫Pratylenchus coffeae，根结线虫Meloidogyne incognita和穴居线虫Radopholus similis。组织化学研究了健康和经线虫感染的香蕉根中酚类化合物的产生，并鉴定了与线虫抗性相关的RAPD标记。根源组织学研究显示，与易感性品种“ Therahaw-1164”（ABB）和“ Jahaji”（AAA）相比，抗性品种“ Karthobiumtham”（ABB）和“ Bhimkol”（BB）中含有酚和木质素细胞的细胞数量更多。使用任意寡核苷酸引物进行的RAPD分析可区分抗性和易感香蕉基因型。在抗性种质中发现的标记带可用于研究线虫抗性的分子基础。这些条带的测序可以帮助建立引起线虫抗性的机制。

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