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Helminthosporium Turcicum
''Setosphaeria turcica'' (anamorph ''Exserohilum turcicum''; formerly known as ''Helminthosporium turcicum'') is the causal agent of northern corn leaf blight in maize. It is a serious fungal disease prevalent in cooler climates and tropical highlands wherever corn is grown. It is characterized by large cigar shaped necrotic lesions that develop on the leaves due to the polyketide metabolite monocerin. Races Races of ''S. turcica'' are named for the maize R genes which are not effective against them. For example, the maize gene ''Ht1'' does not confer resistance against a Race 1 isolate, while genes ''Ht2'' and/or ''Ht3'' do. In contrast, genes ''Ht2'' and ''HtN'' do not confer resistance against a Race 2N isolate, while gene ''Ht1'' does. Isolates which do not overcome any known R gene are termed Race 0. Race 1, which overcomes the ''Ht1'' resistance gene, was originally discovered in Hawaii in 1973. By the time it was first noted in the continental United States, in Indian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fungus
A fungus ( : fungi or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as a kingdom, separately from the other eukaryotic kingdoms, which by one traditional classification include Plantae, Animalia, Protozoa, and Chromista. A characteristic that places fungi in a different kingdom from plants, bacteria, and some protists is chitin in their cell walls. Fungi, like animals, are heterotrophs; they acquire their food by absorbing dissolved molecules, typically by secreting digestive enzymes into their environment. Fungi do not photosynthesize. Growth is their means of mobility, except for spores (a few of which are flagellated), which may travel through the air or water. Fungi are the principal decomposers in ecological systems. These and other differences place fungi in a single group of related organisms, named the ''Eumycota'' (''true f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
