Effects of root temperature on leaf gas exchange and xylem sap abscisic acid concentrations in six Cucurbitaceae species

Title:

Effects of root temperature on leaf gas exchange and xylem sap abscisic acid concentrations in six Cucurbitaceae species

Creator:

Zhang, Y. P., Qiao, Y. X., Zhang, Y. L., Zhou, Y. H., and Yu, J. Q.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:d207e77f-7f25-408a-90ff-11cbace15fe8
uuid:d207e77f-7f25-408a-90ff-11cbace15fe8
issn:0300-3604
doi:10.1007/s11099-008-0065-1

Subject:

adaptation, CO2 assimilation, photosystem 2 photochemistry, photosynthesis, and stomatal behaviour

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Roots of six Cucurbitaceae species were exposed to low (14 °C), middle (24 °C), and high (34 °C) temperatures while aerial parts of plants were maintained at ambient temperatures between 23 and 33 °C. The highest dry mass (DM), photon-saturated rate of net photosynthesis (PNsat), and stomatal conductance (gs) were found at 14 °C in figleaf gourd and turban squash plants, at 24 °C in cucumber and melon plants, while bitter melon and wax gourd plants had lower DM, PNsat, and gs at 14 °C than at 24 or 34 °C. Sub-or supra-optimum root temperatures did not induce photoinhibition but induced slight changes in the quantum efficiency of photosystem 2, PS2 (ΦPS2) and photochemical quenching (qp). Meanwhile, xylem sap abscisic acid (ABA) concentration followed a contrasting change pattern to that of gs. Thus the change in PNsat was mainly due to the change in gs and roots played an important role in the regulation of stomatal behaviour by delivering increased amount of ABA to shoots at sub-or supra-optimum root temperatures. and Y. P. Zhang ... [et al.].

Language:

Multiple languages

Rights:

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

Coverage:

356-362

Source:

Photosynthetica | 2008 Volume:46 | Number:3

Harvested from:

CDK

Metadata only:

false