Histopatología del pino de las alturas ( Pinus hartwegii Lindl.) inoculado con tres hongos ophiostomatoides

the goal of this study was to identify the histological alterations in hartweg pine (pinushartwegii) caused by three species of ophiostomatoid fungi by means of light microscopy. there was an accumulation of resin in the inoculated zone within 10 days, and foliage of inoculated seedlings turned yellow and reddish-brown at 60 days. with inoculation of leptographium guttulatum and ophiostoma olivaceapinii, it was observed that they induce the metabolization of polyphenols, which were deposited on the cell walls of the inner bark, the phloem, vascular cambium and in the pith, where they became necrotic. compared to l. guttulatum and o. olivaceapini, o. ips caused a more severe necrosis of the inner bark, cambium, and pith. in the xylem of inoculated seedlings, the hyphae of the three different fungi penetrated into the tracheids and moved through the bordered pits and radially through the parenchyma cells in the rays.