Does elevated CO2 protect photosynthesis from damage by high temperature via modifying leaf water status in maize seedlings?

Title:

Does elevated CO2 protect photosynthesis from damage by high temperature via modifying leaf water status in maize seedlings?

Creator:

Qu, M. N., Bunce, J. A., and Shi, Z. S.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:a563519e-b2fb-4645-8676-23ae9c36ccab
uuid:a563519e-b2fb-4645-8676-23ae9c36ccab
issn:0300-3604
doi:10.1007/s11099-014-0022-0

Subject:

fotosyntéza, oxid uhličitý, kukuřice, photosynthesis, carbon dioxide, heat stress, leaf water potential, net photosynthesis, stomatal conductance, vapor pressure deficit, maize, 2, and 581

Type:

model:article and TEXT

Format:

print, bez média, and svazek

Description:

We hypothesized that decreased stomatal conductance (gs) at elevated CO2 might decrease transpiration (E), increase leaf water potential (ΨW), and thereby protect net photosynthesis rate (PN) from heat damage in maize (Zea mays L) seedlings. To separate long-term effects of elevated CO2, plants grew at either ambient CO2 or elevated CO2. During high-temperature treatment (HT) at 45°C for 15 min, leaves were exposed either to ambient CO2 (380 μmol mol-1) or to elevated CO2 (560 μmol mol-1). HT reduced PN by 25 to 38% across four CO2 combinations. However, the gs and E did not differ among all CO2 treatments during HT. After returning the leaf temperature to 35°C within 30 min, gs and E were the same or higher than the initial values. Leaf water potential (ΨW) was slightly lower at ambient CO2, but not at elevated CO2. This study highlighted that elevated CO2 failed in protecting PN from 45°C via decreasing gs and ΨW., M. N. Qu, J. A. Bunce, Z. S. Shi., and Obsahuje bibliografii

Language:

Multiple languages

Rights:

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

Coverage:

211-216

Source:

Photosynthetica | 2014 Volume:52 | Number:2

Harvested from:

CDK

Metadata only:

false