Carbon balance of a winter wheat-root microbiota system under elevated CO2

Title:

Carbon balance of a winter wheat-root microbiota system under elevated CO2

Creator:

Šantrůčková, H., Šantrůček, J., Květoň, J., Šimková, M., Elhottová, D., and Roháček, K.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:0cec5b15-97af-4ace-8912-6f088313839b
uuid:0cec5b15-97af-4ace-8912-6f088313839b
issn:0300-3604
doi:10.1023/A:1007081419206

Subject:

carbon partitioning, photosynthesis, plant growth, microbial biomass, respiration rate, and Triticum aestivum L.

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

We examined the carbon budget of young winter wheat plants and their associated microorganisms as affected by a doubling of the atmospheric CO2 concentration (700 µmol mol-1). Plants were grown hydroponically in pre-sterilised sand at a controlled irradiance and temperature regime. Net photosynthesis (PN) and respiration (RD) rates of roots and shoots were measured continuously, plant growth and carbon distribution in the plant-root medium-associated microorganism system were determined destructively in interval-based analyses. PN in elevated CO2 grown plants (EC) was 123% of that in the control (AC) plants when averaged over the whole life span (39-d-old plants, 34 d in EC), but the percentage varied with the developmental stage being 115, 88, and 167% in the pretillering, tillering, and posttillering phase, respectively. There was a transient depression of PN, higher amplitude of day/night fluctuations of the chloroplast starch content, and depression of carbon content in rhizosphere of EC plants during the period of tillering. After 34 d in EC, carbon content in shoots, roots, and in rhizodepositions was enhanced by the factors 1.05, 1.28, and 1.96, respectively. Carbon partitioning between above and belowground biomass was not affected by EC, however, proportionally more C in the belowground partitioning was allocated into the root biomass. Carbon flow from roots to rhizodepositions and rhizosphere microflora was proportional to PN; its fraction in daily assimilated carbon decreased from young (17%) to order (3-4%) plants. and H. Šantrůčková ... [et al.].

Language:

Multiple languages

Rights:

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

Coverage:

341-354

Source:

Photosynthetica | 1999 Volume:36 | Number:3

Harvested from:

CDK

Metadata only:

false