Resin Canal Traits Variation in Pinus spp. with Different Susceptibility to the Pine Wood Nematode

Different studies have emphasized the influence of resin canal traits in susceptibility pine trees to wood nematode (PWN) Bursaphelenchus xylophilus. Resin canals can facilitate PWN migration through stem and are involved accumulation volatile terpenes xylem response pathogen, inducing tracheid embolisms. In this work, we conducted a inoculation experiment under greenhouse conditions investigate anatomical constitutive among seven Pinus species with different degrees PWN: P. canariensis, halepensis, pinea taeda were grouped into ‘low-susceptible group’, pinaster, radiata, sylvestris ‘high-susceptible group’. The high-susceptible group presented higher radial growth, wider cortex, lower frequency smaller than low-susceptible group. size cortical was positively related number seedlings colonized by PWN, suggesting that facilitated migration. increased diminished mean area xylem, showed more induced Additionally, larger growths These results suggest role on spp. PWN. Nevertheless, high interspecific variability found these within each evidences importance other factors