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plant surface microbiology.pdf

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512<br />

Frank B. Dazzo<br />

Fig. 5. Symbiont-specific interaction of trifoliin A white clover lectin and R. leguminosarum<br />

bv. trifolii. A, B Transmission electron microscopy, C–F conventional immunofluorescence<br />

microscopy using antibody to purified trifoliin A. A The historical micrograph<br />

which suggested the involvement of a particulate cross-bridging clover lectin in<br />

the attachment of encapsulated R. leguminosarum bv. trifolii cells to host root hairs.<br />

B Negatively stained particles of purified trifoliin A white clover lectin. C Distribution of<br />

trifoliin A on root hair tips of white clover seedlings. D Intense binding of root-derived<br />

trifoliin A to R. leguminosarum bv. trifolii. E In situ binding of trifoliin A to the polar<br />

capsule of R. leguminosarum bv. trifolii cultured in the external clover root environment.<br />

F Direct detection of trifoliin A at the contact interface (arrow) of rhizobial cells polarly<br />

attached to a white clover root hair. Scale bar A 1 mm, B 25 nm, C 50 mm, D, E F 2 mm.<br />

Reprinted with permission from the American Society for Microbiology

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