Number 1, January

Tree Physiology 18:1–9 [ Summary ] [ Full Text ]
Organic and inorganic sulfur transport in the xylem sap and the sulfur budget of Picea abies trees
Barbara Köstner, Robert Schupp, Ernst-Detlef Schulze and Heinz Rennenberg

Tree Physiology 18:11–20 [ Summary ] [ Full Text ]
Effects of temperature and tissue nitrogen on dormant season stem and branch maintenance respiration in a young loblolly pine (Pinus taeda) plantation
C. A. Maier, S. J. Zarnoch and P. M. Dougherty

Tree Physiology 18:21–28 [ Summary ] [ Full Text ]
Histological response of resistant and susceptible white spruce to simulated white pine weevil damage
Elizabeth S. Tomlin, Rene I. Alfaro, John H. Borden and Fangliang He

Tree Physiology 18:29–36 [ Summary ] [ Full Text ]
Developmental factors responsible for heterosis in aspen hybrids (Populus tremuloides × P. tremula
Bailian Li, Glenn T. Howe and Rongling Wu

Tree Physiology 18:37–43 [ Summary ] [ Full Text ]
Changes in the relationship between tree size and aboveground respiration in field-grown hinoki cypress (Chamaecyparis obtusa) trees over three years
Taketo Yokota and Akio Hagihara

Tree Physiology 18:45–51 [ Summary ] [ Full Text ]
Seasonal changes in leaf nitrogen pools in two Salix species
Olevi Kull, Andres Koppel and Asko Noormets

Tree Physiology 18:53–58 [ Summary ] [ Full Text ]
Accumulation of flavonoids and related compounds in birch induced by UV-B irradiance
Anu Lavola

Tree Physiology 18:59–64 [ Summary ] [ Full Text ]
Growth and development of the arborescent cactus Stenocereus queretaroensis in a subtropical semiarid environment, including effects of gibberellic acid
Eulogio Pimienta, Gerardo Hernandez, Alejandro Domingues and Park S. Nobel

Tree Physiology 18:65–68 [ Summary ] [ Full Text ]
Thigmomorphogenesis: a dose response to flexing in Ulmus americana seedlings
Frank W. Telewski and Michele L. Pruyn

Tree Physiology 18:69 [ Free Full Text ]
A note on the report by M. B. Lavigne and M. G. Ryan relating stem maintenance respiration rate
Jeffrey S. Amthor

Tree Physiology 18:69 [ Free Full Text ]
Reply to letter by J. S. Amthor
M. B. Lavigne and M. G. Ryan

Tree Physiology 18:70 [ Free Full Text ]
Book Review
Tree–Crop Interactions: A Physiological Approach
Chin K. Ong and Peter Huxley
Reviewed by Damase Khasa