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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Puccinia coronata ： ウィキペディア英語版 Puccinia coronata ''Puccinia coronata'' is a plant pathogen and causal agent of oat and barley crown rust. The pathogen occurs worldwide, infecting both wild and cultivated oats. It is a relatively new disease of barley in North America. It was first found in 1992 in a barley breeding nursery near Clay Center, Nebraska. Since then, crown rust has been found throughout the upper Midwest, with greatest incidence in the central Red River Valley of North Dakota and Minnesota. In that region the alternate host, common buckthorn (''Rhamnus cathartica''), grows abundantly in shelter belts and riparian areas. Since 1993, outbreaks of crown rust have occurred on barley and forage grasses at several localities in this region. The extent of yield losses in barley caused by this disease have not been determined. Crown rust posed a threat to barley production, because the first infections in barley occur early in the season from local inoculum.〔(USDA ARS )〕 Crown rusts have evolved many different physiological races within different species in response to host resistance. Each pathogenic race can attack a specific line of plants within the species typical host. For example, there are over 290 races of P. coronata. Crops with resistant phenotypes are often released, but within a few years virulent races have arisen and ''P. coronata'' can infect them. 〔 == Symptoms == Uredinia are linear, light orange, and occur mostly on the leaf blades but occasionally occur also on leaf sheaths, peduncles and awns. Extensive chlorosis is often associated with the uredinia. Telia are mostly linear, black to dark brown, and are covered by the host epidermis.〔 Although infection by crown rust does not usually kill whole plants, it does kill individual leaves of the plants. This greatly reduces photosynthetic processes which in turn reduces growth and crop yields. In addition, if plants are badly infected, they become more sensitive to drought conditions which can cause death. ウィキペディア（Wikipedia）』 ■ウィキペディアで「Puccinia coronata」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.