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The infection process of Colletotrichum graminicola and relative aggressiveness on four turfgrass species

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Abstract:

Detached 3-week-old leaves of Agrostis palustris, Lolium perenne, Poa annua, and Poa pratensis were inoculated with conidial suspensions of two isolates of Colletotrichum graminicola obtained from A. palustris. Inoculated leaves were incubated at 23 °C under high relative humidity (>95%). The infection process was investigated by light microscopy from 2 to 168 h after inoculation (AI). Spore germination was observed within 2 h AI, appressoria within 6 h AI, and penetration pores within 8 h AI on all four hosts. Infection hyphae were observed inside epidermal cells within 24 h AI on all four hosts, but significantly greater infection was observed in A. palustris and P. annua than in L. perenne or P. pratensis at both 96 and 120 h AI. Acervuli appeared on leaves of A. palustris at 72 h AI and on L. perenne at 96 h AI but were not found on either P. annua or P. pratensis during the first 168 h AI. The infection process was similar to that reported for C. graminicola from other hosts; however, disease development of the two isolates of C. graminicola from A. palustris was faster or fungal growth more extensive on detached leaf tissue of A. palustris than on other turfgrass species tested.Key words: annual bluegrass, anthracnose, creeping bentgrass.

Des feuilles détachées de Agrostis palustris, Lolium perenne, Poa annua et Poa pratensis, vieilles de 3 semaines, ont été inoculées avec des suspensions conidiales de deux isolats de Colletotrichum graminicola obtenus à partir de A. palustris. Les feuilles inoculées ont été incubées à 23 °C sous humidité relative élevée (>95 %). Le processus d'infection a été examiné sous microscope optique de 2 à 168 h après l'inoculation (AI). La germination des spores fut observée à l'intérieur de 2 h AI, des appressoriums à l'intérieur de 6 h AI, et des pores de pénétration à l'intérieur de 8 h AI, sur les quatre hôtes étudiés. Des hyphes d'infection ont été observés à l'intérieur de cellules épidermiques, à l'intérieur de 24 h AI, chez les quatre hôtes, mais un infection significativement plus importante a été observée chez A. palustris et P. annua par rapport à L. perenne ou à P. pratensis à 96 et 120 h AI. Des acervulums sont apparus sur les feuilles de A. palustris à 72 h AI et sur celles de L. perenne à 96 h AI, mais n'ont pas été retrouvés sur P. annua ou P. pratensis au cours des premières 168 h AI. Le processus d'infection était semblable à celui décrit pour C. graminicola chez d'autres hôtes; toutefois, le développement de la maladie pour deux isolats de C. graminicola provenant de A. palustris était plus rapide, ou la croissance fongique plus abondante, sur des tissus de feuilles détachées de A. palustris que sur d'autres espèces de gazon analysées.Mots clés : pâturin annuel, anthracnose, agrostide traçante.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: July 1, 2003

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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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