溫度影響pythium aphanidermatum及P. spinosum對胡瓜根部的感染
Other Title
Effect of temperature on the infection, of cucumber root by Pythium aphanidermatum and P. spinosum
Journal
植物保護學會會刊
Journal Volume
32
Journal Issue
1
Pages
1-9
Date Issued
1990-02
Date
1990-02
Author(s)
羅朝村
林益昇
Lo, C.T.
Lin, Y.S.
Abstract
盆栽試驗顯示，混雜Pythium aphanidermatum (Pa)及P. spinosum(Ps)之自然田土經蒸氣消毒（100℃, 1.5hr，二次）及藥劑處理(Ridomil-MZ 400X或Dexon 1000X,.100 ml/2kg土壤）後，可顯養抑制胡瓜碎倒病的發生與提高植株生長（與對照植物比蜘。Pa-1菌株在Czapek’s agar上菌絲之最適生長溫度及感染胡瓜根部最適溫度（種子測定法）為32-36℃，而Ps-1則均為24-28℃。在病土以馬鈴薯及胡瓜組織塊誘釣法中，Pa-1與Ps-1菌株纏繞組織塊之最適溫度，則分別在28℃以上及20℃以下。另外，在溫室或田間試驗，從對照田或派加S-H混合物之處理田的胡瓜根部分離Pythium spp.均顯示，在夏季（日平均溫度高於27.2℃以上）以Pa之出現頻率最高，而在冬季（日平均溫度低於18.2℃）則以Ps出現率較高
。由是觀之，很度除可影響Pa、Ps對胡瓜根部之感染力(infectivity)外，尚可影響寄主生長勢及土壤微生物問的競爭力。
In pot test, when the field soil naturally infested with Pythium aphanidermatum (Pa) and P. spinosum (Ps) was treated with steam (100 C, 1.5hr, twice) or fungicides (Ridomil-MZ, 400x or Dexon, 1000x, 100 ml / 2Kg) , it promoted the growth potential and reduced the damping off of cucumber plants compared with check plant. In laboratory tests, the optimum mycelial growth temperature (on Czapek’s agar) and optimum infection temperature (by seed testing method) of Pa-1 and Ps-1 were 32-36℃ and 24-28℃, respectively. However, by using tissue baiting technique, the optimum bait colonization temperature of Pa-1 was above 28℃ and Ps-1 was below 20℃. In greenhouse and field experiments, the isolations of Pythium species were made from cucumber rootlets grown in either nontreated soil (control ) or (S-H) mixture amended soil (1600 Kg / ha), and the results showed that the highest frequencies were recorded in summer ( above 27.2 C, daily average temperature) for Pa and in winter (below 18.2 C, daily average. temperature) for Ps. Therefore, the results suggested that temperature might influence the growth potential of host plant, the competition ability of soil microflora and the infectivity of Pa-1 and Ps-1 to the cucumber root.
Subjects
胡瓜
溫度
優勢種
感染
猝倒病菌
cucumber
Pythium aphanidermaturn
P. spinosum
temperature
infection dominant species
Publisher
中華植物保護學會
Type
journal article
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