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題 名 | Lack of Host Specificity of Strains of Erwinia Rhapontici, Causal Agent of Pink Seed of Pulse and Cereal Crops=豆類及禾本科作物粉紅種子病病原菌Erwinia Rhapontici不具寄主專一性 |
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作 者 | 黃鴻章; 謝廷芳; | 書刊名 | Botanical Studies |
卷 期 | 48:2 2007.04[民96.04] |
頁 次 | 頁181-186 |
分類號 | 373.9 |
關鍵詞 | 粉紅種子病; 寄主專一性; 菌株特異性; Erwinia rhapontici; Host specificity; Pink seed disease; Strain differentiation; |
語 文 | 英文(English) |
中文摘要 | Erwinia rhapontici係造成作物粉紅種子與軟腐病的病原菌,本病原菌菌株分離自碗豆、菜豆、扁豆、雞豆、小麥、油菜或加拿大西部罹病田田土,並於室內與田問測試其寄主專一性。在室內生長箱試驗時,碗豆、菜豆、扁豆及雞豆的幼嫩豆莢以每莢注射接種0.1亳升病原細菌胞子懸浮液(1×10^9 cfu/ml)之量接種所有測試菌株,而小麥的孕穗期幼穗則先以鐵刷擦傷,再以噴霧接種方式每株接種20毫升細菌胞子懸浮液。結果所有的菌株均可危害所有測試作物,無關菌株來源,且大部分菌株危害種子比率超過50%,顯示本病原菌不具寄主專一性。於2003至2004年的田問試驗結果亦顯示,當健康的硬粒小麥、春小麥及菜豆在幼穗或果莢形成期以鐵刷刮傷後,緊臨於以罹病種子栽植的罹病碗豆時,罹病株上之接種源可傳播並危害周遭的健康植株。對於由不具寄主專一性的E. rkapontici所引起的粉紅種子病在病害管理上所造成的衝擊,將於文中一併討論。 |
英文摘要 | Erwinia rhapontici is the causal agent of pink seed and soft rot diseases of several crops. Laboratory and field experiments were conducted to study the host specificity of strains of E. rhapontici collected from diseased seeds of pea, bean, lentil, chickpea, wheat, and canola or from infested field soil in western Canada. For the growth chamber experiments, plants of pea, bean, lentil and chickpea were inoculated with each strain of E. rhapontici by injection of bacterial suspension (1×10^9cfu/mL) into young pods at 0.1mL/pod, whereas developing heads of wheat were injured by abrading with a wire brush and inoculated by spraying of bacterial suspension at 20mL/plant. Results showed that the E. rhapontici strains were not host specific, since all of the strains could infect each of the host crops tested, regardless of the origin of strains. The frequency of infected seeds was high (>50%) for most strain by crop combinations. Field experiments conducted in 2003 and 2004 revealed that the inoculum of E. rhapontici on infected pea seeds was readily transmitted to neighboring crops of durum wheat, spring wheat, and common bean, if the crops were injured by abrading with a wire brush at the early pod formation stage. The impact of the lack of host specificity on management of the pink seed disease caused by E. rhapontici is discussed. |
本系統中英文摘要資訊取自各篇刊載內容。