Bio-Organic Chemical Studies on Resistance of Solanacea Plant Stock against Soilborn Disease

1.茄子砧木“Taibyo VF“乙醚乙酸乙酯可溶性组分对土传病害病原菌具有抑菌活性。它们的活性比茄子“千良”的活性高。这一结果表明，某些真菌毒性化合物部分参与了抗性。分离得到5种酚类化合物和3种倍半萜类化合物，并确定了它们的化学结构。其中之一是solavetivone，含量相当大。这些数据表明，solavetivone在Taibyo VF抗性中起重要作用。番茄砧木“Taibyo shinko No.1“的乙醚和乙酸乙酯可溶性组分也显示出比番茄“Kyoryoku beiju”更强的活性。醚溶物中的真菌毒性化合物为6种甾体生物碱，其中4种为新化合物，4种为C18-羟基脂肪酸，7种为酚类化合物。由于醚溶性组分中的碱性化合物表现出最高的杀菌活性，因此甾体类生物碱可能是抗真菌的关键化合物。

1. Eggplant stock "Taibyo VF"Ether ethyl acetate soluble fractions showed antifungal activities against the pathogens of soilborn diseases. They had a higher activity than those from a eggplant "Senryo". This result suggestes that some fungitoxic compounds partly participate in resistance. Five phenolic compounds and three sesquiterpenes were isolated as fungitoxic compounds and their chemical structures were determined. One of them is solavetivone and the content is rather large. These data show that solavetivone plays an important part in resistance of Taibyo VF.2. Tomato stock "Taibyo shinko No. 1"Ether and ethyl acetate soluble fractions also showed stronger activities than those of tomato "Kyoryoku beiju". Fungitoxic compounds from ether soluble fraction were six steroidal alkaloids including four new compounds, four C18-hydroxy fatty acids and seven phenolic ompounds. Since basic compounds in ether soluble fraction showed the highst fungitoxic activity, the steroidal alkalcids are suggested to be key compounds for resistance.