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Molecular and Pathogenic Characterization of -like Anamorphs Causing Root and Basal Rot of Almonds.

Authors:
Nieves Capote María Ángeles Del Río Juan Francisco Herencia Francisco Teodoro Arroyo

Plants (Basel) 2022 Apr 4;11(7). Epub 2022 Apr 4.

Andalusian Institute of Agricultural and Fisheries Research and Training (IFAPA) Centro Las Torres, 41200 Seville, Spain.

Three almond nurseries were prospected in the South of Spain (Sevilla) to evaluate the sanitary status of the nursery plant material. Samples consisted of main roots, secondary roots and six-month-old basal stems 'GxN-15', 'Nemaguard', 'Cadaman', 'Rootpac-40' and 'Rootpac-20' rootstocks planted in the soil, and twigs of mother plants from 'Lauranne', 'Guara', 'Marcona', 'Marta' and 'Ferragnes' almond cultivars. Endophytic and potential pathogenic fungi were identified in mother plants and 70 -like anamorph isolates were detected in the root system and basal stems of analyzed rootstocks. Based on partial sequencing of the gene and multilocus phylogenetic analysis of the concatenated ITS, , and partial sequences, seven -like anamorph species were identified as , , , sp. 1, and Pathogenicity was assessed on young healthy detached twigs of 'Guara' almond cultivar and one-year-old 'Lauranne' potted almonds grafted onto 'GxN-15' rootstocks. Among the seven -like anamorph species, sp. 1 and were the most aggressive. Inoculated detached shoots developed necrotic lesions 15 days after inoculation. Inoculated trees showed sectorized necrosis in the main and secondary roots and the basal stem of the rootstock 5 months after inoculation. The most aggressive species were able to cause necrosis also in the grafted cultivar, and and also reduced the root biomass. This is the first report of -like anamorph species causing root and basal rot of almonds.

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http://dx.doi.org/10.3390/plants11070984DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9003061PMC
April 2022

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