Master of Science (MS)
First Advisor's Name
Kelsey R. Downum
First Advisor's Committee Title
Second Advisor's Name
David W. Lee
Third Advisor's Name
Bradley C. Bennett
Date of Defense
Variation of phenylheptatriyne (PHT) concentrations in leaves of Bidens alba (Linn.) var. radiata (Schultz-Bip.) was investigated across it's Florida range, throughout the year and in response to photoenvironment. Natural surveys of PHT concentrations in B. alba leaves were done at 13 sites in Florida and three sites throughout the year. PHT concentrations were significantly different between populations (p<0.001) but showed little relationship with latitude (R2 =0.024) and none with longitude. Concentrations in leaves fluctuated throughout the year (p<0.001). They were highest in October, followed by June and lowest in January and April. Photoenvironmental influences were experimentally tested. PHT concentrations decreased under low R/FR treatments and increased under filtered UV treatments. Low light quantity did not significantly influence PHT concentrations but decreased PHT levels and leaf biomass. The results suggests that PHT concentrations in B. alba leaves vary in nature and that light quality, R/FR and UV, may effect PHT biosynthesis.
Cantonwine, Emily Gayle, "Phenylheptatriyne variation in bidens alba var. radiata leaves" (1999). FIU Electronic Theses and Dissertations. 2031.
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