Martin, N. E. 



1980. Interactions of pectins and tissues of Cronartium ribicola 

 and Pinus monticola in culture. USDA For. Serv. Res. Pap. 

 INT-250, 5 p. Intermt. For. and Range Exp. Stn. , Ogden, Utah 

 84401. 



Cronartium ribicola , the blister rust fungus of 5-needle pines 

 establishes itself by adhering to the surfaces of host cells and will 

 then penetrate the cell walls with haustoria. Success occurs when 

 enzymes are produced that hydrolyze the cellulose, pectin, and protein 

 constituents of the host cell and when the by-products of enzyme 

 activity are not toxic to the host cell or fungus. Cultures of fungus 

 and pine cells when challenged with pectin compounds responded through 

 cell proliferation and death. Host's cells succumbed at lower 

 concentrations of pectic compounds and were more sensitive as the 

 complexity of the pectin compounds decreased than were the 

 rust cells. 



KEYWORDS: host-parasite interactions, blister rust, western white pine 



Martin, N. E. 



1980. Interactions of pectins and tissues of Cronartium ribicola 

 and Pinus monticola in culture. USDA For. Serv. Res. Pap. 

 INT-250, 5 p. Intermt. For. and Range Exp. Stn., Ogden, Utah 

 84401. 



Cronartium ribicola , the blister rust fungus of 5-needle pines 

 establishes itself by adhering to the surfaces of host cells and will 

 then penetrate the cell walls with haustoria. Success occurs when 

 enzymes are produced that hydrolyze the cellulose, pectin, and protein 

 constituents of the host cell and when the by-products of enzyme 

 activity are not toxic to the host cell or fungus. Cultures of fungus 

 and pine cells when challenged with pectin compounds responded through 

 cell proliferation and death. Host's cells succumbed at lower 

 concentrations of pectic compounds and were more sensitive as the 

 complexity of the pectin compounds decreased than were the 

 rust cells. 



KEYWORDS: host-parasite interactions, blister rust, western white pine 



•<^U.S. GOVERNMENT PRINTING OFFICE; 



1980-0-677-1 21/138 



