DescriptionParasitism of pythium debaryanum hesse on the potato tuber 412.jpg
English: PHYSIOLOGICAL STUDY OF THE PARASITISM OF
PYTHIUM DEBARYANUM HESSE ON THE POTATO
TUBER by Lon A. Hawkins and Rodney B. Harvey, Journal of Agricultural Research voi. xviii, no. 5
PLATE 36
Photographs enlarged from portions of a motion photomicrograph, showing the method of cell wall penetration by Pythium hyphae.
A. — Shows hypha growing toward the potato cell wall.
B. — Shows hypha attached to wall and about to penetrate.
C. — The tip has just broken through the wall.
D. — The penetration is complete. Note the black line at the point where the hypha penetrates the wall. This may be due to a rolling up of the potato cell wall about the hypha or to a difference in refraction caused by compression of the wall.
Lon A. Hawkins, Rodney b. Harvey, United States. Dept. of Agriculture; Association of American Agricultural Colleges and Experiment Stations; Association of Land-Grant Colleges and Universities; Association of Land-Grant Colleges
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