Monoterpene composition : response to stress in lodgepole pine seedlings Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/0k225d74s

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  • Lodgepole pine seedlings were used to test a general hypothesis of how water and nitrogen stress affect a plants' monoterpene composition. Four treatments, consisting of high and low levels of both water and nitrogen, were applied to the trees. Growth measurements, consisting of shoot and needle lengths, needle fresh weights and areas, foliar nitrogen contents, and pre-dawn plant moisture potentials, were made to determine the effects of the treatments. Significantly greater growth occurred in the high water, high nitrogen treatment. Both low water treatments resulted in the least growth. Monoterpene composition of current years' needles was analyzed monthly during the five months following budburst. Although many qualitative differences were found among the individual compounds each month, no definite pattern in the changes could be found. However, when monoterpene composition was quantified by totaling the integrator peak areas for a sample, definite seasonal and treatment effects becaine evident. Total amounts of monoterpenes reached a maximum as shoot and needle growth slowed. The treatments averaged nearly a five-fold increase in peak area. over the growing season. Trees in the high water, low nitrogen treatment were often lower in peak area than the other treatments. The effects of water stress and high nitrogen nutrition led to the highest amounts of monoterpenes. Monoterpenes have implications in tree defense from insect attack and possibly in storage of metabolically active compounds. Both functions are alluded to in this study.
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