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.

Reaction of yellow passion fruit to passion fruit woodiness disease and to bacterial spot

“…MAR20#10 (37.5%) and MAR20#41 (25.0%) were the genotypes with the greatest numbers of resistant plants at the end of the study, contrasting with MAR20#19 (12.5%) and MAR20#2005 (5.9%). Differently from our findings, Costa et al (2018) did not observed a single resistant plant to Xap strain UnB-1393 after five evaluations in a distinct season. According to Fuhrmann et al (2014), these results point to the existence of diverse genetic resistance levels to bacterial spot, including within plants of the same genotype.…”

“…The remaining genotypes were classified as MS (Table 2). Our findings are corroborated by Costa et al (2018) who also verified that MAR20#2005 (S) and MSCA (S) presented higher severity scores as compared to other genotypes when inoculated with UnB-1393 Xap strain during the wet season. Conversely, Nogueira (2016) found greater susceptibility of Rosa Intenso (MS), MAR20#41 (S), and MSCA (S) when 90-day-old plants were inoculated with UnB-1393 Xap strain during the same study period of this report.…”

“…The trait bacterial spot severity was positively correlated to bacterial spot incidence at a magnitude of 0.81 (P ≤ 0.01). Strong correlations between disease severity and incidence have also been reported for PWD and bacterial spot (COSTA et al, 2018;VIANA et al, 2014b). Therefore, this information emphasizes the importance of analysing these variables during plant selection.…”

“…Therefore, this information emphasizes the importance of analysing these variables during plant selection. Additionally, Costa et al (2018) distinguished a contrasting response from genotypes regarding bacterial spot disease and PWD. The authors found that genotypes with greater resistance to bacterial spot showed greater susceptibility to PWD.…”

Screening of Sour Passion Fruit for Reaction to Bacterial Spot and Passion Fruit Woodiness Disease

“…Naturally occurring multiple resistance to numerous pathogens have been recorded for a few crops (Melo et al, 2008;Neder, Pinto, Melo, Lepre, & Peixouto, 2010;Wisser et al, 2011). However, multiple pathogen reaction studies are limited for sour passion fruit (Costa et al, 2018a(Costa et al, , 2018b. Most studies performed for this crop under protected cultivation are focused on mechanical inoculation of a single pathogen (Fuhrmann et al, 2014;Viana et al, 2014aViana et al, , 2014b.…”