Developmental change in CO2 compensation concentrations in Spartina alterniflora results from sigmoidal photosynthetic CO2 responses

Title:

Developmental change in CO2 compensation concentrations in Spartina alterniflora results from sigmoidal photosynthetic CO2 responses

Creator:

Bärlocher, M. O., Campbell, D. A., Al-Asaaed, S., and Ireland, R. J.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:14e9551d-2e01-4536-aa9d-87f86b93904a
uuid:14e9551d-2e01-4536-aa9d-87f86b93904a
issn:0300-3604
doi:10.1023/B:PHOT.0000015460.48593.00

Subject:

aerenchyma, bundle sheath, Carex, leaf age, leaf anatomy, net photosynthetic rate, seasonal changes, species differences, and Zea

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

We investigated seasonal patterns of photosynthetic responses to CO2 concentrations in Spartina alterniflora Loisel, an aerenchymous halophyte grass, from a salt marsh of the Bay of Fundy (NB, Canada), and from plants grown from rhizome in controlled-environment chambers. From late May to August, CO2 compensation concentrations (Γ) of field-grown leaves varied between 2.5-10.7 cm3(CO2) m-3, with a mean of 5.4 cm3(CO2) m-3. From September onwards field leaves showed CO2 compensation concentrations from 6.6-21.1 cm3(CO2) m-3, with a mean of 13.1 cm3 m-3 well into the C3-C4 intermediate range. The seasonal variability in Γ did not result from changing respiration, but rather from a sigmoidal response of net photosynthetic rate (PN) to applied CO2 concentration, found in all tested leaves but which became more pronounced late in the season. One explanation for the sigmoidal response of PN to external CO2 concentration could be internal delivery of CO2 from roots and rhizomes to bundle sheath cells via the aerenchyma, but the sigmoidal responses in S. alterniflora persisted out to the tips of leaves, while the aerenchyma extend only to mid-leaf. The sigmoidicity persisted when CO2 response curves were measured from low to high CO2, or from high to low CO2, and even when prolonged acclimation times were used at each CO2 concentration. and M. O. Bärlocher ... [et al.].

Language:

Multiple languages

Rights:

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

Coverage:

365-372

Source:

Photosynthetica | 2003 Volume:41 | Number:3

Harvested from:

CDK

Metadata only:

false