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Scientia Silvae Sinicae ›› 2002, Vol. 38 ›› Issue (4): 84-88.doi: 10.11707/j.1001-7488.20020414

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STUDIES ON THE PHYTOTOXIC ACTIVITIES OF LA-Ⅰ AND LA-Ⅱ PRODUCING BY BROWN SPOT NEEDLE BLIGHT FUNGUS (LECANOSTICTA ACICOLA)

Yang Bin,Ye Jianren,Bao Hong,Liu Jikai,Dong Zejun   

  1. Nanjing Forestry University Nanjing 210037;Kunming Institute of Botany,The Chinese Academic of Science Kunming 650204
  • Received:2001-05-08 Revised:1900-01-01 Online:2002-07-25 Published:2002-07-25

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Abstract:

Brown spot needle blight of pine was an important disease in South China, which was caused by Lecanosticta acicola. The pathogen could produce two kinds of toxin, LA-Ⅰand LA-Ⅱ. The toxin activities and basic properties of LA-Ⅰand LA-Ⅱ were studied in the way of bioassay. The results indicated that LA-Ⅰand LA-Ⅱ could not only injure the seedlings of host pine (Pinus elliottii,P.taeda) but also make the seedlings of other plants (P.yunnanensis,P.armandii and Eupatorium sp.) wilt. So both of the two toxins were non host specific toxins(NHST). LA-Ⅰand LA-Ⅱ could keep their toxic activities for 15 minutes after boiling. The minimal effective concentrations of LA-Ⅰand LA-Ⅱ were 100?μg·mL and 500 μg·mL respectively and their activities were not very strong.LA-Ⅰand LA-Ⅱ could not affect their activities each other when they were mixed.

Key words: Lecanosticta acicola, Toxins, Toxic activity