Full text of this article is only available in PDF format.

Olavi Luukkanen (email)

Investigations on factors affecting net photosynthesis in trees : gas exchanges in clones of Picea abies (L.) Karst

Luukkanen O. (1978). Investigations on factors affecting net photosynthesis in trees : gas exchanges in clones of Picea abies (L.) Karst. Acta Forestalia Fennica no. 162 article id 7596. https://doi.org/10.14214/aff.7596

Abstract

The net photosynthetic rate per unit of foliage was studied in two-year old cuttings of Norway spruce (Picea abies (L.) H. Karst.), representing four clones, at varying temperature and soil moisture. The CO2 compensation point (Γ), photorespiration, dark respiration, and water balance were also investigated. All these characteristics indicated differences among the clones. A correlation between CO2 exchange and transpiration suggested that stomatal control determined at least a part of this variation during a favourable water balance. An inverse relationship existed between Γ and net photosynthetic rate, and the same curvilinear model explained this variation in unstressed as well as stressed plants at a given temperature. An increase in Γ seems to be a normal result of water stress, particularly at high temperature, indicating an increase in mesophyll resistance to CO2 diffusion. This result was in agreement with calculated values of mesophyll resistance. It also supported our earlier conclusions about the significance of mesophyll resistance during water stress.

Keywords
Norway spruce; Picea abies; photosynthesis; water stress; temperature; clones; heredity; mesophyll resistance

Published in 1978

Views 1178

Available at https://doi.org/10.14214/aff.7596 | Download PDF

Creative Commons License CC BY-SA 4.0

Register
Click this link to register to Silva Fennica.
Log in
If you are a registered user, log in to save your selected articles for later access.
Contents alert
Sign up to receive alerts of new content

Your selected articles
Send to email
Luukkanen O., (1978) Investigations on factors affecting net photosyn.. Acta Forestalia Fennica vol. 0 no. 162 article id 7596 (remove) | Edit comment
Your search results