. Principles of modern biology. Biology. The Plant Kingdom - 609 Fig. 31-16. Wheat rust, growing on wheat stubble (left) and on barberry leaves (right). This basidiomycete (Pucc/nia graminis) is a very destruc- tive parasite. Summer spores of this rust can pass from wheat plant to wheat plant. But the fall spores, which grow upon wheat stubble, can continue to live only if they manage to infest the leaves of the common barberry bush. Only winter spores, formed in the barberry leaves, are capable of surviving through a cold season. Consequently, it is the winter spores (at least in northern reg
. Principles of modern biology. Biology. The Plant Kingdom - 609 Fig. 31-16. Wheat rust, growing on wheat stubble (left) and on barberry leaves (right). This basidiomycete (Pucc/nia graminis) is a very destruc- tive parasite. Summer spores of this rust can pass from wheat plant to wheat plant. But the fall spores, which grow upon wheat stubble, can continue to live only if they manage to infest the leaves of the common barberry bush. Only winter spores, formed in the barberry leaves, are capable of surviving through a cold season. Consequently, it is the winter spores (at least in northern regions) that reinfect the wheat crop when the following spring arrives. The name "rust" derives from the orange color of the summer sporangia, formed on the leaves of the wheat. (Photos by Benjamin Koehler; from The Plant World.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marsland, Douglas, 1899-. New York, Holt, Rinehart and Winston
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