Thesis (Ph. D.)--University of Hong Kong, 2006. / Title proper from title frame. Also available in printed format.

Thesis (Ph. D.)--University of Chicago, Dept. of Botany. / Includes Abstract. A Dissertation, submitted to the Faculty of the Ogden Graduate School of Science, in candidacy for the Degree of Doctor of Philosophy, Department of Botany. Includes bibliographical references.

No description available.

No description available.

Typescript (photocopy) / Digitized by Kansas Correctional Industries

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1992. / Vita. Abstract. Includes bibliographical references (leaves 19-20). Also available via the Internet.

Thesis--University of Florida. / Description based on print version record. Typescript. Vita. Includes bibliographical references (leaves 83-87).

published_or_final_version / abstract / Ecology and Biodiversity / Doctoral / Doctor of Philosophy

Three holly cultivars, Ilex crenata, Thunb. 'Helleri' and 'Rotundifolia' and Ilex cornuta Lindl. et Paxt. 'Burfordi' were grown in 3 liter containers at 200, 300, 400 and 500 ppm nitrogen (N). Significant correlation coefficients were found between plant growth (dry wt accumulation) and both leaf N content and soil solution nitrates, while low correlation coefficients were found between soil nitrates and plant growth. Shoot growth of 'Helleri' and 'Burfordi' was not increased by N levels higher than 300 ppm while 400 ppm N was optimal for 'Rotundifolia'. The effects of 3N levels on tissue N fluctuations during a flush of growth on 'Helleri' were also studied. For all N levels, tissue N levels were shown to increase following the cessation of stem elongation until a level of tissue N was reached where a new flush of growth began. These N levels were approx the same for all N treatments. The time necessary to reach this level was dependent on the level of N added; 5 weeks for 300 ppm, 13 weeks for 150 ppm and 18 weeks for 50 ppm N. Once new growth began, tissue N levels began to decrease. The response of 'Helleri' to 15 fertilizer treatments consisting of different time and lengths was studied. Fertilizer applied during a period following the cessation of stem elongation and before the next flush resulted in greater total N and shoot growth, regardless of whether it was also applied during other weeks or not. Root growth was suppressed by 3 or more fertilizer applications, regardless of the time of application. / Ph. D.

The effects of 6-benzylamino purine (BA) concentration and timing of BA application at various phases of bud development of Ilex crenata Thunb. 'Rotundifolia' were studied. Foliar applications of BA at 800 ppm to unbranched rooted cuttings enhanced axillary bud development resulting in well branched Iiners. Axillary bud development of rooted cuttings was enhanced when applications were made when buds were swelIing preceding a flush of growth. Applications made prior to bud swelling or made during a flush of growth were ineffective in stimulating additional axillary bud development. Combined applications of BA at 800 ppm to liners preceding two successive flushes of growth resulted in a 68% increase in total numbers of shoots per plant over control plants. Applications of BA at 600 ppm and 800 ppm to individual shoots resulted in swelling of the terminal 4-5 cm section of treated stems and development of a red pigment followed by growth of numerous axillary shoots on the stem produced by the apical bud. Applications of BA at 1000 ppm and 1200 ppm to individual shoots acted as chemical pinching agents inhibiting apical buds. Leaves on shoots which developed from liners treated with BA at 1200 ppm were 46% smaller than those on control plants. These suppressed leaves contained 60% fewer upper epidermal cells than leaves of control plants, and average epidermal cell size was 24% larger than those of control plants. / Ph. D.