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Studies using scanning and transmission electron microscopy revealed that pollen grains of alfalfa (Medicago sativa) are susceptible to infection by mycoparasitic fungi, Coniothyrium minitans and Gliocladium catenulatum. The mode of infection was similar between the two mycoparasites. The infection process involved direct hyphal penetration of pollen cell walls, most frequently through germ pores. Growth and proliferation of the invading hyphae in the cell lumen resulted in plasmolysis, as well as degradation and disintegration of pollen cytoplasm. The impact of infection of alfalfa pollen grains by C. minitans and G. catenulatum on dispersal of these mycoparasites and their potential for control of blossom blight of alfalfa, caused by Sclerotinia sclerotiorum, is discussed.

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Universidad Autónoma del Estado de México
Sistema de Información Científica Redalyc ®
Versión 3.0 | 2018
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