Kelsey, Rick G. , and Michael G. Harrington. 



1979. A search for ph3^otoxins influencing germination and early 

 growth of ponderosa pine. USDA For. Serv. Res. Pap. INT- 

 216, 28p. Intermt. For. andRangeExp. Stn.,Ogden, Utah 84401. 



Live and dead tissues of ponderosa pine were examined for volatile 

 and water-extractable ph3^otoxins that inhibit the germination and early 

 growth of ponderosa pine seedhngs. No highly toxic substances were 

 discovered. Germination of ponderosa pine seeds was reduced if the 

 seeds were sown on soils collected from beneath a pine canopy. 



KEYWORDS: Pinus ponderosa Laws. , germination, allelopathy, ph3^o- 

 toxins, chemical ecology. 



Kelsey, Rick G. , and Michael G. Harrington. 



1979. A search for phytotoxins influencing germination and early 

 growth of ponderosa pine. USDA For. Serv. Res. Pap. INT- 

 216, 28 p. Intermt. For. andRangeExp. Stn. , Ogden, Utah 84401. 



Live and dead tissues of ponderosa pine were examined for volatile 

 and water-extractable phytotoxins that inhibit the germination and early 

 growth of ponderosa pine seedhngs. No highly toxic substances were 

 discovered. Germination of ponderosa pii. seeds was reduced if the 

 seeds were sown on soils collected from beneath a pine canopy. 



KEYWORDS: Pinus ponderosa Laws., germination, allelopathy, phj^o- 

 toxins, chemical ecology. 



■ttU.S. GOVERNMENT PRINTING O FFIC E: 1 9 7 9-0-67 7-0 1 9/ 5 6 



