Endophytes of industrial hemp (Cannabis sativa L.) cultivars: identification of culturable bacteria and fungi in leaves, petioles, and seeds

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From: Canadian Journal of Microbiology(Vol. 64, Issue 10)
Publisher: NRC Research Press
Document Type: Report
Length: 9,592 words
Lexile Measure: 1400L

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Abstract :

Plant endophytes are a group of microorganisms that reside asymptomatically within the healthy living tissue. The diversity and molecular and biochemical characterization of industrial hemp-associated endophytes have not been previously studied. This study explored the abundance and diversity of culturable endophytes residing in petioles, leaves, and seeds of three industrial hemp cultivars, and examined their biochemical attributes and antifungal potential. A total of 134 bacterial and 53 fungal strains were isolated from cultivars Anka, CRS-1, and Yvonne. The number of bacterial isolates was similarly distributed among the cultivars, with the majority recovered from petiole tissue. Most fungal strains originated from leaf tissue of cultivar Anka. Molecular and phylogenetic analyses grouped the endophytes into 18 bacterial and 13 fungal taxa, respectively. The most abundant bacterial genera were Pseudomonas, Pantoea, and Bacillus, and the fungal genera were Aureobasidium, Alternaria, and Cochliobolus. The presence of siderophores, cellulase production, and phosphorus solubilization were the main biochemical traits. In proof-of-concept experiments, re-inoculation of tomato roots with some endophytes confirmed their migration to aerial tissues of the plant. Taken together, this study demonstrates that industrial hemp harbours a diversity of microbial endophytes, some of which could be used in growth promotion and (or) in biological control designed experiments. Keywords: hemp, endophytes, siderophore, Pseudomonas, molecular detection, antifungal activity. Les endophytes des plantes forment un groupe de microorganismes qui resident de maniere asymptomatique a l'interieur des tissus vivants sains. La diversite, la caracterisation moleculaire et biochimique des endophytes associes au chanvre industriel n'ont pas ete etudiees jusqu'a present. Cette etude a explore l'abondance et la diversite d'endophytes cultivables qui resident dans les petioles, les feuilles et les semences de trois cultivars de chanvre industriel, et examine leurs caracteristiques biochimiques et leur potentiel antifongique. Un total de 134 souches bacteriennes et 53 souches fongiques ont ete isolees a partir des cultivars Anka, CRS-1 et Yvonne. Le nombre d'isolats bacteriens etait distribue de maniere similaire entre les cultivars, la majorite etant recuperee du tissu des petioles. La plupart des souches fongiques provenaient du tissu foliaire du cultivar Anka. Les analyses moleculaires et phylogenetiques groupaient les endophytes en 18 taxons bacteriens et 13 taxons fongiques, respectivement. Les genres bacteriens Pseudomonas, Pantoea et Bacillus et les genres fongiques Aureobasidium, Alternaria et Cochliobolus etaient les plus abondants. La presence de siderophores, la production de cellulase et la solubilisation du phosphore constituaient les principales caracteristiques biochimiques des endophytes. Lors d'experiences de validation de principe, la reinoculation de racines de tomates avec certains endophytes a confirme qu'ils migraient vers les tissus aeriens des plants. Dans son ensemble, cette etude demontre que le chanvre industriel comporte une diversite d'endophytes microbiens dont certains pourraient etre utilises dans des experiences de stimulation de la croissance ou de controle biologique. [Traduit par la Redaction] Mots-cles : chanvre, endophytes, siderophore, Pseudomonas, detection moleculaire, activite antifongique.
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Gale Document Number: GALE|A557705741