. Journal of agricultural research . 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 thehypha penetrates the wall. This may be due to a rolling up of the potato cell wallabout the hypha or to a difference in refraction caused by compression of the wall. PLATE 37 Photographs enlarged from portions of a motion photomicrograph, showing themethod of cell wall penetration by Pythium hyphae. A.—Shows the hypha growing
. Journal of agricultural research . 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 thehypha penetrates the wall. This may be due to a rolling up of the potato cell wallabout the hypha or to a difference in refraction caused by compression of the wall. PLATE 37 Photographs enlarged from portions of a motion photomicrograph, showing themethod of cell wall penetration by Pythium hyphae. A.—Shows the hypha growing against the potato cell wall. Sufficient pressure hasalready been applied to cause the hypha to bend. Notice that this bending increasesin later photographs. B.—^A little later stage than A. C.—The tip has broken through as a small tube. D.—Penetration is complete. Notice the constriction of the hypha at the pointwhere it?.penetrates the potato cell wall. Parasitism of Pythium debaryanum on ttie Potato Tuber PLATE 37. B
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagricul, bookyear1913
