Relationship between photosynthetic activity and chlorophyll content in an isolated Quercus ilex L. tree during the year

Title:

Relationship between photosynthetic activity and chlorophyll content in an isolated Quercus ilex L. tree during the year

Creator:

Gratani, L., Pesoli, P., and Crescente, M. F.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:91127b76-7eee-410b-8a4c-d5ec170857b0
uuid:91127b76-7eee-410b-8a4c-d5ec170857b0
issn:0300-3604
doi:10.1023/A:1006924621078

Subject:

net photosynthetic rate, oak, regression analysis, seasonal course, and stomatal conductance

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

The relationship between chlorophyll (Chl) content and net photosynthetic rate (PN) in an isolated Quercus ilex tree, growing inside Villa Pamphili Park in Rome, was explored. The highest PN was in March, May, and September (10.1 μmol m-2 s-1, maximum rate). PN decreased by 65 % (with respect to the yearly maximum) when leaf temperature reached 34 °C, and by 50 % when leaf temperature was 9 °C. The highest Chl contents were in April, October [1.47 g kg-1 (d.m.), maximum value], and December. The lowest Chl content was found in July (0.78 g kg-1). The decrease of PN in July was in close connection with the decrease of Chl content. On the contrary, the high Chl content during winter did not correspond with PN of this season. Discordances between Chl content and PN over the year influenced the regression analysis, which although positive did not show very high correlation coefficients (r = 0.7). The high Chl (a+b) content during most of the year indicated that the photosynthetic apparatus remained basically intact also during stress periods. and L. Gratani, P. Pesoli, M. F. Crescente.

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

445-451

Source:

Photosynthetica | 1998 Volume:35 | Number:3

Harvested from:

CDK

Metadata only:

false