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頁籤選單縮合
題 名 | 臺灣苦蘵白粉病之病原鑑定=The Occurrence of Powdery Mildew on Physalis Angulata Caused by Podosphaera Xanthii |
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作 者 | 鄭奇煒; 陳瑞祥; 張文興; 蔡竹固; | 書刊名 | 植物保護學會會刊 |
卷 期 | 48:1 民95.03 |
頁 次 | 頁41-51 |
分類號 | 433.4 |
關鍵詞 | 苦蘵; 白粉病; 聚合酶連鎖反應; 核醣體核酸內轉錄間隔區; Podosphaera xanthii; Sphaerotheca fusca; Physalis angulata; Powdery mildew; Polymerase chain reaction; rDNA internal transcribed spacer; |
語 文 | 中文(Chinese) |
中文摘要 | 本文初次報導台灣苦蘵白粉病發生,於2005年2月和11月分別自嘉義縣中埔鄉和屏東縣內埔鄉採集苦蘵罹患白粉病植株,白粉覆蓋於葉片、葉柄及莖部,嚴重感染時造成葉部黃化及落葉,但未能發現白粉菌之有性世代。取病葉上分生孢子振落於健康的苦蘵幼苗上, 於接種 2 日後,在 葉片上 出現 白粉 病斑。 採得病原菌菌絲體樣品後,萃取其菌體 DNA ,並以增幅白粉菌核糖體核酸內轉錄間隔區(ITS)之引子對 PN23/PN34 進行聚合酶連鎖反應,得到一 699 bp 之產物;經解序後,與 NCBI 之基因庫比對,發現其與 Sphaerotheca fusca (編號 AB040351)、 Podosphaera xanthii (編號 AB046985 )的 ITS 序列分別具有高達99、98% 的一致性。比較所採得之病原菌與 S . fusca 的孢子外觀及形態類似,鑑定台灣苦蘵白粉病菌應為 Podosphaera xanthii ,而 Sphaerotheca fusca 為其同種異名。以 P . xanthii 序列所設計的引子對S1/S2,進行P . xanthii 的聚合酶連鎖反應(PCR),可以得到一 454 bp之專一性預期產物,而無法自Erysiphe heraclei、Oidium murrayae及Microsphaera diffusa增幅出任何產物。 |
英文摘要 | Water hyacinth ( Eichhornia crassipes (Mart.) Solms) is one of the world's most-noxious aquatic weeds, owing to its life cycle and survival strategies that have given it a competitive edge over other species. Vegetative propagules of water hyacinth were collected from irrigation and drainage ditche s in Changhua and planted in artificial ponds. Seasonal variations in the plant growth rate, leaf production, and seed yield were investigated; and water quality of ditch water samples was also measured. The mean leaf number on an individual plant of water hyacinth showed an increase of from 5 to 17.8 leaves in a month after planting. Mean leaf longevity for lower leaves (node numbers 1~14) was longer than that for upper leaves during the experimental interval. Each capsule contained an average of 42 ± 22 filled seeds, and 16.1 % ± 13.7 % of seeds germinated. The wide variations in seed number and germination were frequently observed in our experiments. Seasonal patterns obtained in growth evaluations with water hyacinth plants cultivated in an artificial pond with running irrigation water were characterized by four phases: a delayed phase (in a temperature range of 16.2~19.4 °C ) followed by linear growth, two linear growth phases (in a temperature range of 21~25.7 °C ), and a rapid exponential phase (in a temperature range of 27.2~28.5 °C ). The fresh biomass was higher when planted in summer (July) than in other seasons. The pH of the sampled sites was consistent throughout the entire experiment (mean pH 8~8.3). The analytical values of electrical conductivity (EC) had a distinct trend of steadily increasing from 0.63 to 0.98 mS/cm at which time there was 90 %~100 % surface coverage. Water hyacinths did not emerge in waters in which the EC exceeded about 3.2 mS/cm. |
本系統中英文摘要資訊取自各篇刊載內容。