Wheat Leaf Rust
1985; Elsevier BV; Linguagem: Inglês
10.1016/b978-0-12-148402-6.50010-9
Autores Tópico(s)Powdery Mildew Fungal Diseases
ResumoPublisher Summary This chapter provides an overview of distribution, importance, and control of wheat leaf rust. Wheat leaf rust, caused by Puccinia recondite, usually does not cause spectacular damage; however, on a worldwide basis, it causes more damage than other wheat rusts. The leaf rust organism can be grown in axenic culture, although growth is limited. Therefore, although availability of nutrients in the host influences the rate and amount of rust development, specific nutrients are not likely to be responsible for the specificity shown in gene-for-gene interactions. Wheat leaf rust occurs wherever wheat is grown, and it is the commonest, most widely distributed of all cereal rusts. The chapter describes the mechanisms that most likely contribute to the evolution of leaf rust races—asexual recombination, alternate hosts, and mutation. Avirulence in leaf rust is usually dominant; a recessive mutation to virulence at one allele of any locus can, therefore, only be detected by selfing cultures on the aecial host. Thus, when a part of a rust population is heterozygous for virulence at a particular locus, a mutation occurring at the other allele would result in a virulent strain in the rust population.
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