454 



891. , and McLaughlin, R. E. 1977. Comparison of the lipids and fatty acids 

 of Mattesia grandis and the fat body of the host, Anthonomus grandis . J. 

 Invortebr. Pathol. 30: 108-109. 



The neogregarine, M attesia grandis , infects larvae and adults of the boll weevil, 

 Anthonomus grandis (Coleoptera: Curculionidae) of the fatty acids from total 

 lipids of the pathogen and host fat body are 16:00, 16:1, 18:00, 18:1, 18:2 and 

 18:3. Possibly 18:2 and 18:3 acids are essential to the pathogen, and deple- 

 tion of these acids in fat body may limit growth. However, the requirement 

 for polyunsaturated fatty acids does not appear to be the controlling factor 

 in pathogen infection. It has been shown that 18:2 and 18:3 fatty acids com- 

 prise up to 33% of the total acids in the fat body of adult greater wax moth, 

 Galleria mellonella , yet M. grandis will not infect this moth. Phosphatidyl 

 choline (PC) comprises 73% of the total phospholipids in the pathogen compared 

 with 41% in the host. Also, PC and phosphatidyl ethanolamine (PE) occur in about 

 equal percentages in the adipose tissue of the host. It is not known whether 

 the pathogen utilizes the phospholipids of the host intact or synthesizes its 

 own. However, the host can obtain polyunsaturated fatty acids only by ingestion, 

 and there is a direct competition for these compounds by the pathogen. Moreover, 

 this competition is severe because of the extended development stages of the 

 pathogen, which eventually utilizes all the adipose tissue of the host. Pro- 

 gressive utilization of the fatty acids by the pathogen and destruction of the 

 fat body of the host impairs molting, pupation, ecdysis, and egg synthesis in 

 the infected female boll weevil. 



892. ; Pratt, J. R.; Minyard, J. P.; and Hedin, P. A. 1970. Constituents 

 of the cotton bud. XVII. A survey of the lipids and fatty acids of 

 glanded and glandless cotton with respect to nutrition and host-pre- 

 ference of the boll weevil. J. Econ. Entomol. 63: 753-756. 



Lipid extracts of 'Acala' 4-42-77 and 'Rex Smcothleaf' and of their isogenic 





