Host status of stinking passion flower and yellow passion fruit to Rotylenchulus reniformis, Meloidogyne javanica and Pratylenchus brachyurus

Abstract Stinking passion flower (Passiflora foetida L.) is an herbaceous vine used due its medicinal properties. It could be an option to be used as a rootstock for sour passion fruit (P. edulis). This interest was especially motivated by its resistance to Fusarium oxysporum f. sp. passifloraeand F. solani, two soilborne pathogens that severely limit the sour passion fruit cultivation in Brazil. Phytonematodes are other important soil pathogens to most crops, including Passiflora species, and they often interact synergistically with pathogenic Fusarium spp. strains. However, the host status of stinking passion flower to phytonematodes was not assessed yet. Therefore, three pot experiments were carried out in order to assess the reproduction of Rotylenchulus reniformis, Meloidogyne javanica and on Pratylenchus brachyurusstinking passion flower and sour passion fruit. Both P. foetida and P. edulis were susceptible to R. reniformis, but immune (or highly resistant) to both M. javanica and P. brachyurus. Based on previous and the present work, R. reniformis stands out and could be pointed as the most important species to species of Passiflora.

摘要 臭西番莲（Passiflora foetida L.）是一种兼具药用价值的草质藤本植物，可作为酸西番莲（P. edulis）的潜在砧木材料。该应用前景主要依托其对尖孢镰刀菌西番莲专化型（Fusarium oxysporum f. sp. passiflorae）与茄病镰刀菌（F. solani）的抗性——这两类土传病原菌严重限制了巴西境内酸西番莲的商业化种植。此外，植物线虫（Phytonematodes）亦是包括西番莲属（Passiflora）植物在内的多数作物的重要土传病原物，且常与致病性镰刀菌菌株产生协同互作。然而，目前尚无研究评估臭西番莲对植物线虫的寄主适配性。为此，本研究设置3组盆栽试验，以探究肾形肾状线虫（Rotylenchulus reniformis）、爪哇根结线虫（Meloidogyne javanica）及短尾短体线虫（Pratylenchus brachyurus）在臭西番莲与酸西番莲上的繁殖动态。结果表明，臭西番莲与酸西番莲均对肾形肾状线虫易感，但对爪哇根结线虫和短尾短体线虫表现为免疫（或高抗）。结合前期研究与本试验结果，肾形肾状线虫可被认定为西番莲属植物最具危害性的线虫物种。