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Settling and feeding behavior of sharpshooter vectors of Xylella fastidiosa on plum genotypes resistant to leaf scald disease
European Journal of Plant Pathology ( IF 1.8 ) Pub Date : 2020-09-06 , DOI: 10.1007/s10658-020-02104-8
Heloisa Thomazi Kleina , Karla Kudlawiec , Mariana B. Esteves , Marco A. Dalbó , Thiago de Paula Oliveira , Nathalie Maluta , João R. S. Lopes , Louise L. May-De-Mio

Plum leaf scald (PLS) is a serious disease caused by Xylella fastidiosa subsp. multiplex, a pathogenic bacterium transmitted by xylem-sap feeding leafhoppers, commonly named sharpshooters (Hemiptera: Cicadellidae: Cicadellinae). In Brazil, the development of plum genotypes that apparently are not infected under field conditions has opened new perspectives for disease control based on host plant resistance. For example, PLS incidence on ‘SC13’ and ‘SC7’ genotypes is almost null under field conditions, although ‘SC13’ is infected by graft inoculation. Thus, we hypothesized that the performance of these genotypes in the field may be related to vector behavior. To verify this hypothesis, we investigated the settling preference and probing and feeding behavior of the sharpshooters Bucephalogonia xanthophis (Berg) and Sibovia sagata (Signoret) on the PLS-resistant plum genotypes, ‘SC7’ and ‘SC13’, and on the naturally infected cultivar, ‘Laetitia’. In the settling experiments, ‘SC7’ was less preferred by both vector species. For S. sagata held on ‘SC13’, reduced sap ingestion rates were observed. For B. xanthophis, probing and feeding activities differed between individuals held on ‘SC13’ and ‘Laetitia’. Specifically, duration of the stylet pathway phase, duration of xylem sap ingestion events, and number of interruptions of the xylem phase differed for B. xanthophis held on ‘SC13’ and ‘Laetitia’. The results show that the resistant genotypes affected host plant selection by the sharpshooters and highlight the importance of incorporating vector behavior into studies aimed at identifying or developing X. fastidiosa-resistant genotypes.



中文翻译:

抗小叶病的李子基因型上的小木杆菌的神射手载体的沉降和取食行为

梅叶烫伤(PLS)是由Xylella fastidiosa亚种引起的严重疾病。多重,一种由木质部汁液喂养的叶蝉传播的致病细菌,通常被称为神枪手(半翅目:Ci科:Cicadellinae)。在巴西,李子基因型的发展显然不在田间条件下感染,这为基于寄主植物抗性的疾病控制开辟了新的前景。例如,在田间条件下,“ SC13”和“ SC7”基因型的PLS发病率几乎为零,尽管“ SC13”已通过移植接种感染。因此,我们假设这些基因型在野外的表现可能与媒介的行为有关。为了验证这一假设,我们研究了神枪手的沉降偏好以及探测和进给行为Bucephalogonia xanthophis(伯格)和Sibovia sagata(Signoret)上的耐PLS-梅基因型, 'SC7'和'SC13',并且在自然感染品种, '霁霞'。在沉降实验中,两种载体物种均不太优选“ SC7”。对于保留在“ SC13”上的S. sagata,观察到汁液摄入率降低。对于B. xanthophis,在“ SC13”和“ Laetitia”上的个体之间的探测和进食活动有所不同。具体而言,对于黄腐芽孢杆菌,通心针途径阶段的持续时间,木质部汁液摄入事件的持续时间以及木质部阶段的中断次数有所不同在“ SC13”和“ Laetitia”上举行。结果表明,抗性基因型影响了神枪手对寄主植物的选择,并突出了将载体行为纳入旨在鉴定或发展耐X.fastidiosa抗性基因型的研究中的重要性。

更新日期:2020-09-07
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