Type of Document	Dissertation
Author	Elkner, Timothy Edward
URN	etd-05112006-154744
Title	Photosynthate production and partitioning in apple leaves
Degree	PhD
Department	Horticulture
Advisory Committee	Advisor Name Title Barden, John A. Committee Chair Byers, Ross E. Committee Member Marini, Richard P. Committee Member Seiler, John R. Committee Member Wolf, Dale D. Committee Member
Keywords	Leaves Microbiology. Photosynthesis. Apples.
Date of Defense	1990-05-01
Availability	unrestricted
Abstract Mature field-grown apple trees were used to gain a better understanding of the influences of light and fruit on leaf physiology. Light effects on net photosynthesis (Pn), specific leaf weight (SLW), leaf N content (Weight/area) (Nw), and leaf N concentration (% dry weight) (Np) of spur leaves from two canopy locations were evaluated on four dates in 1987. Interior leaves had lower Pn, SLW, Nw, and Np than exterior leaves. In 1988 the influence of %available photosynthetic photon flux (PPF) on the same parameters was examined throughout the season. On most measurement dates both Pn and SLW increased quadratically while Nw increased linearly with increasing PPF. In both years positive linear relationships existed between Pn and Nw, SLW and Nw, and Pn and SLW.
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