Penetration and infection of corn by Puccinia polysora Underw.
Santiago Oro, R.; Exconde, O.R.
Philippine Agriculturist 58(1/2): 50-60
Puccinia polysora penetrated corn leaves through stomata directly by germ tube. Hyphal growth originating from just below the guard cells was strictly intercellular among the mesophyll cells, without invading the vascular elements. Haustoria were formed both in the mesophyll and epidermal cells. Uredia were produced from the pseudoparenchymatous funguous layer arising from the dense mycelial growth at the point of penetration. Ten days after inoculation, uredia erupted with the son developing at the point of inoculation. Fungal development pattern in the leaf sheath, midrib and husk was the same as in the leaf.