Cytopathological changes of maize leaf tissue infected by Curvularia lunata (Wakker) Boed

HUANG Li-li, WANG Lan, KANG Zhen-sheng, ZHAO Jie, ZHANG Guan-qu

Acta Phytopathologica Sinica ›› 2004, Vol. 34 ›› Issue (1) : 21-26.

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PDF(1298 KB)
Acta Phytopathologica Sinica ›› 2004, Vol. 34 ›› Issue (1) : 21-26.

Cytopathological changes of maize leaf tissue infected by Curvularia lunata (Wakker) Boed

  • HUANG Li-li1, WANG Lan1,2, KANG Zhen-sheng1, ZHAO Jie1, ZHANG Guan-qu1
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Abstract

The transmission electron microscope and cytochemical technique were employed to examine the alteration of ultrastructure and cell wall components of maize leaf tissue, uninfected and infected by Curvularia lunata (Wakker) Boed. After invading into the maize leaf tissue, the pathogen spread inter-cellularly and then formed intracellular hyphae in the necrotic host cells. As the extension of the hy-phae, a series of cytopathological changes occurred in the host tissue, including plasmolysis, necrosis of protoplasm, degeneration of organelles such as chloroplasts and vacuoles, and collapse of host cells. The cytochemical labeling of main cell wall components in C. lunata-infected leaf tissue showed that the labeling densities for cellulose, xylan, pectin were significantly reduced as compared with that in unino-culated healthy tissue. These results indicate that cell wall-degrading enzymes such as cellulases, xy-lanases, pectinases secreted by C. lunata are closely related to the penetration and extension of pathogen.

Key words

maize / Curvularia lunata / ultrastructure / cytochemistry / cell wall-degrading enzymes

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HUANG Li-li, WANG Lan, KANG Zhen-sheng, ZHAO Jie, ZHANG Guan-qu. Cytopathological changes of maize leaf tissue infected by Curvularia lunata (Wakker) Boed[J]. Acta Phytopathologica Sinica, 2004, 34(1): 21-26
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