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Responses of 2 epiphytic yeasts to foliar infection by Rhizoctonia solani or mechanical wounding on the phylloplane of tall fescue

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A growth-chamber experiment was conducted to determine how foliar disease or wounding affects the ability of 2 phylloplane yeasts (Rhodotorula glutinis and Cryptococcus laurentii) to colonize leaves of tall fescue (Festuca arundinacea). Yeasts were applied separately and together onto healthy leaves, leaves infected with Rhizoctonia solani (diseased), and mechanically bruised (wounded) leaves. In all 3 trials, the leaf disturbance treatment significantly affected the abundance of yeast on the phylloplane of tall fescue. Yeast abundance on the diseased or wounded leaves was significantly greater than on the nontreated, healthy leaves. In 2 of the 3 trials, the yeast species applied also had a significant affect on yeast abundance. Typically, R. glutinis was significantly more abundant than C. laurentii when applied individually, but not significantly greater than the total yeast colony-forming units of the co-inoculated treatment. When the 2 yeasts were co-inoculated onto the leaves, R. glutinis comprised 89.7%, 75.4%, and 67.6% of the recovered yeast colony-forming units on healthy, diseased, and wounded leaves, respectfully. Our data suggest that these 2 species of yeasts will differentially colonize compromised leaf tissue with disease or wounds favoring populations of R. glutinis over C. laurentii.

Une expérience en chambre de croissance a été réalisée pour déterminer comment les maladies foliaires ou les blessures affectent la capacité de deux levures du phylloplan (Rhodotorula glutinis et Cryptococcus laurentii) de coloniser les feuilles de la fétuque faux-roseau (Festuca arundinacea). Les levures ont été inoculées séparément ou ensemble sur des feuilles saines, des feuilles infectées par Rhizoctonia solani (malades) et des feuilles coupées mécaniquement (blessées). Dans les 3 essais, les traitements endommageant les feuilles affectaient significativement l’abondance des levures dans le phylloplan de la fétuque faux-roseau. L’abondance des levures sur les feuilles malades ou blessées était significativement plus élevée que sur les feuilles saines non traitées. Dans 2 des 3 essais, l’espèce de levure inoculée avait aussi un effet significatif sur son abondance. Typiquement, la population de R. glutinis était significativement plus abondante que celle de C. laurentii lorsqu’elles étaient inoculées séparément mais pas significativement plus grande que le nombre total d’UFC de levures co-inoculées. Lorsque les deux espèces de levures étaient co-inoculées sur les feuilles, R. glutinis constituait 89,7 %, 75,5 % et 67,6 % des UFC de levures récupérées des feuilles saines, malades et blessées, respectivement. Nos données suggèrent que ces 2 espèces de levures coloniseront de façon différentielle les tissus foliaires fragilisés par la maladie ou les blessures, les populations de R. glutinis étant favorisées par rapport à celles de C. laurentii.

Document Type: Research Article

Publication date: 2009-10-01

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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