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Two glasshouse experiments were conducted to determine the potential for Armillaria species to infect fireweed and subsequently use it as a food base for attacking lodgepole pine. Aspen segments colonized by A. mellea and A. ostoyae were used to inoculate fireweed roots. Both species caused infection, although the former was more pathogenic, attacking 28 of 42 inoculated fireweed roots as opposed to 8 of 60 in the case of the latter species. None of the nine pines inoculated with segments of fireweed roots colonized by A. ostoyae became infected, even though the isolates were pathogenic on pine when aspen segments were used as the food base. In contrast, 8 of 29 pine seedlings inoculated with fireweed colonized by A. mellea were killed, thus suggesting that fireweed could play some role in the epidemiology of this disease. 相似文献
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Lipid class and fatty acid composition of phospholipids from the gonads of skipjack tuna 总被引:1,自引:0,他引:1
Seiichi HIRATSUKA Tomoko KITAGAWA Yoko MATSUE Masayuki HASHIDUME Shun WADA 《Fisheries Science》2004,70(5):903-909
ABSTRACT: Lipid class and fatty acid composition of phospholipids from the gonads of skipjack tuna were examined to evaluate effective utilization of the processing of by-products. The predominant phospholipids in the ovaries were phosphatidylcholine (PC; 47.9%), phosphatidylethanolamine (PE; 19.3%) and lyso-phosphatidylcholine (LPC; 19.1%). In contrast, those in the testes were PC (40.1%), PE (29.3%) and phosphatidylserine (PS; 9.6%). The percentage of docosahexaenoic acid (DHA) was markedly high at more than 50% in LPC of the ovaries, and PE and PS of the testes were also high. The percentages of DHA at sn-position 2 of the predominant phospholipids, except for PC in the testes, were more than 60%, in particular PE in the testes was remarkably high at 81.9%. After storage for 2 days at 5°C, the LPC content in the ovaries increased twofold and the DHA level of LPC was the same as before, though the contents of other phospholipids decreased. 相似文献
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