Ruan Lifang, Yu Ziniu, Fang Bin, He Wei, Wang Yujie, Shen Ping
Key Laboratory of Agricultural Microbiology, Ministry of Education, Wuhan, PR China.
Syst Appl Microbiol. 2004 May;27(3):286-9. doi: 10.1078/0723-2020-00265.
The pigment melanin is well known to protect against the damaging effects of UV radiation. In this study, we show that thirty-five of thirty-seven tested Bacillus thuringiensis strains possess the potential to produce melanin in the presence of L-tyrosin at elevated temperature (42 degrees C). These findings offer a method of protecting insecticidal toxins produced by B. thuringiensis from UV degredation and may therefore have important applications in the field of crop protection. Toxicity assays on Heliothis armigera suggested that the insecticidal activity of B. thuringiensis that produced melanin was significantly higher after UV irradiation than when melanin was not produced.
众所周知，色素黑色素可抵御紫外线辐射的破坏作用。在本研究中，我们发现，在三十七株受试苏云金芽孢杆菌菌株中，有三十五株在高温（42摄氏度）及L-酪氨酸存在的情况下具有产生黑色素的潜力。这些发现提供了一种保护苏云金芽孢杆菌产生的杀虫毒素免受紫外线降解的方法，因此可能在作物保护领域具有重要应用。对棉铃虫的毒性测定表明，产生黑色素的苏云金芽孢杆菌在紫外线照射后的杀虫活性显著高于未产生黑色素时。
