Yellow passion fruit reaction to Xanthomonas axonopodis pv. passiflorae and to Cowpea aphid-borne mosaic virus

Abstract Yellow passion fruit (Passiflora edulis Sims) yield and longevity have been drastically reduced by bacterial spot (Xanthomonas axonopodis pv. passiflorae - Xap) and passion fruit woodiness disease (PWD) (Cowpea aphid-borne mosaic virus - CABMV). This study was aimed at evaluating the reaction of 11 genotypes of yellow passion fruit, based on the reaction of their progenies, to both mechanically inoculated Xap and CABMV, under greenhouse conditions. There was a progressive increase in bacterial spot and PWD severity with time. BRS Gigante Amarelo, MAR20#12, and MAR20#34 were selected as the progenies with lowest bacterial spot severity and disease progress over time. MAR20#2005, EC-L-7, UnB2015-1, and EC-3-0 presented the lowest PWD severity and disease progress over time. These progenies, along with individual plants from other progenies in which disease severity was significantly low until the last evaluation, will be cloned and tested again for Xap and CABMV, including other isolates.

研究摘要：黄果西番莲（Passiflora edulis Sims）的产量与寿命因细菌性斑点病（Xanthomonas axonopodis pv. passiflorae，简称Xap）以及西番莲木质化病毒病（PWD，病原为豇豆蚜传花叶病毒（Cowpea aphid-borne mosaic virus，简称CABMV））的双重侵染，出现大幅降低。本研究旨在以11个黄果西番莲基因型的子代的抗病反应为依据，评价其对机械接种的Xap与CABMV的抗性表现，试验于温室条件下开展。随着试验时长推移，细菌性斑点病与PWD的病情严重度呈渐进式加重。其中，BRS Gigante Amarelo、MAR20#12、MAR20#34这三个子代的细菌性斑点病病情严重度与病害进展速率均为最低。MAR20#2005、EC-L-7、UnB2015-1、EC-3-0这四个子代的PWD病情严重度与病害进展速率均为最低。上述子代，以及其余直至最终评估阶段病情严重度仍显著偏低的其他子代中的单株，将被克隆，并再次开展Xap与CABMV（含其他分离物）的抗性验证试验。