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題 名 | 萵苣褐斑病菌之半選擇性培養基=A Semiselective Medium for Detecting Acremonium Lactucae, the Causal Agent of Lettuce Brown Spot |
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作 者 | 林秀儒; 黃振文; | 書刊名 | 植物病理學會刊 |
卷 期 | 11:3 2002.09[民91.09] |
頁 次 | 頁147-156 |
分類號 | 435.252 |
關鍵詞 | 萵苣; 萵苣褐斑病; 半選擇性培養基; 頭孢菌屬病害; Lettuce; Brown spot of lettuce; Semiselective medium; Acremonium disease; |
語 文 | 中文(Chinese) |
中文摘要 | 評估十四種碳素源與十八種氮素源對萵苣褐斑病菌Acremonium lactucae(AL-0818和AL-0724菌株)菌絲生長的影響,發現蔗糖及半乳糖兩種碳素源可顯著促進菌絲的生長;至於氮素源中,則以酪蛋白有助於菌絲生長。在培養基中,當蔗糖和酪蛋白兩者的重量比在10與13.3時,分別有助於促進本菌AL-0724與AL-0818菌株發芽管的生長。比較十八種化學藥劑對本菌菌絲與發芽管生長的影響,發現貝芬替150ppm,福多寧50ppm,鏈黴素50ppm等藥劑的湸量均不具抑制本菌的功效。進一步,將蔗糖30g、酪蛋白3g、磷酸氫二鉀1g、硫酸鎂0.5g、氯化鉀0.5g、硫酸鐵0.01g、洋菜粉15g與蒸餾水1L均勻混合,經高溫高壓(121℃,15lb,30min)滅菌後,待溫度降至50℃時,再逐一添加貝芬替150ppm、福多寧50ppm、鏈黴素200ppm和新黴素50ppm等藥劑配制成SC(Sucrose-Casein)半選擇性培養基。利用SC半選擇性培養基可以由一般栽培田或連作罹病田的土壤中偵測到本菌的存在,同時發現每克土中含有菌量數約0至4.3×103cfu間。 |
英文摘要 | Fourteen carbohydrates and eighteen nitrogenous compounds were evaluated for their effects on mycelial growth of two isolates, AL-0818 and AL-0724 of Acremonium lactucae, the causal agent of brown spot of lettuce. Among carbon sources, sucrose and galactose were more effective than other carbohydrates to enhance the growth of A. lactucae. As to nitrogenous compounds, casein was the most effective in stimulating growth of the pathogen isolates. The optimum ratio of sucrose and casein by weight was at 10 for AL-0724 or at 13.3 for AL-0818. Eighteen pesticides were respectively added into the basal medium (a modified Czapek's medium containing sucrose and casein, SC-medium) for indexing their suppressive effectiveness. Carbendazim at 150ppm and flutonlanil at 50ppm were not obvious to inhibit the pathogen. In advance, carbendazim, flutonlanil, streptomycin sulfate, and neomycin sulfate were selected to make up a formulation of the semiselective medium. The relationship between concentrations of the four pesticides and the germ-tube growth length of the pathogen was analyzed for determining the optimal formulation that favored the growth of A. lactucae and suppressed the contamination of undesired microorganisms. Finally, surcrose-casein semiselective medium (SC-semiselective medium) was composed of 30g sucrose, 3g casein, 1gK2HPO4, 0.5g KCI, 0.5g MgSO4.7H2O, 0.01gFeSO4.7H2O, 15g agar, 150ppm carbendazim, 50ppm flutonlanil, 200ppm streptomycin sulfate, 50ppm neomycin sulfate and 1L distilled water. The results showed that SC semiselective medium was able to accurately detect the pathogen from artificially and naturally infested soils. Generally, population density of the pathogen in naturally infested field soil was 0-4.3×103 cfu/g soil by detection with SC semiselective medium. |
本系統中英文摘要資訊取自各篇刊載內容。