Anatomy of sporosori of Polymyxa graminis, the vector of Indian peanut clump virus, in roots of Sorghum bicolor

Anatomical studies of Polymyxa graminis, the vector of West African and Indian peanut clump virus (IPCV), have been limited. Light, laser confocal, and in situ scanning electron microscopy were used to study mature or nearly mature sporosori of the vector in roots of Sorghum bicolor. Large numbers o...

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Bibliographic Details
Published in:Canadian journal of plant pathology 1997-09, Vol.19 (3), p.281-288
Main Authors: Littlefield, L.J, Delfosse, P, Whallon, J.H, Hassan, Z.M, Sherwood, J.L, Reddy, D.V.R
Format: Article
Language:English
Subjects:
descriptions
disease vectors
fungal anatomy
fungal spores
peanut clump furovirus
Polymyxa graminis
Sorghum bicolor
ultrastructure
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Summary:Anatomical studies of Polymyxa graminis, the vector of West African and Indian peanut clump virus (IPCV), have been limited. Light, laser confocal, and in situ scanning electron microscopy were used to study mature or nearly mature sporosori of the vector in roots of Sorghum bicolor. Large numbers of sporosori occurred in host tissue, including the epidermis, cortical parenchyma, and endodermis, sometimes almost filling host cells. In cross-sections of sporosori, 10-40 individual, closely aggregated resting spores were typically observed. In three-dimensions, sporosori frequently appeared to contain up to several hundred resting spores. Resting spores appeared to form by cleavage of sporogenic plasmodia; mature resting spores were approximately 4-7 micrometers in diameter. Resting spores became more spherical as they matured, and angular spaces developed in the interstices between many of the resting spores within sporosori. The amount of apparent space between resting spores within sporosori appeared different when examined by laser confocal compared to in situ scanning electron microscopy.
ISSN:0706-0661
1715-2992
DOI:10.1080/07060669709500524