Caragana korshinskii seedlings maintain positive photosynthesis during short-term, severe drought stress

Title:

Caragana korshinskii seedlings maintain positive photosynthesis during short-term, severe drought stress

Creator:

Fang, X. W., Turner, N. C., Li, F. M., Li, W. J., and Guo, X. S.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:4918d5d2-8676-45fa-a456-41e83baf43f5
uuid:4918d5d2-8676-45fa-a456-41e83baf43f5
issn:0300-3604
doi:10.1007/s11099-011-0067-2

Subject:

botanika, botany, chlorophyll fluorescence, photochemical efficiency, photosynthesis, proline, water deficit, and water relations

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Seedling performance may determine plant distribution, especially in water-limited environments. Plants of Caragana korshinskii commonly grow in arid and semiarid areas in northwestern China, and endure water shortage in various ways, but little is known about their performance when water shortage occurs at early growth stages. The water relations, photosynthetic activity, chlorophyll (Chl) content and proline accumulation were determined in 1-year-old seedlings growing in a 1:1 mixture of Loess soil and Perlite and subjected to (1) a water deficit for 20 days and (2) kept adequately watered throughout. The water deficit induced low (-6.1 MPa) predawn leaf water potentials (LWP), but did not induce any leaf abscission. Stomatal conductance (gs), leaf transpiration rate (E), and net photosynthetic rate (PN) decreased immediately following the imposition of the water deficit, while the maximal photochemical efficiency of photosystem II (PSII) (Fv/Fm) and the effective quantum yield of PSII (ΦPSII) decreased 15 days later. An early and rapid decrease in gs, reduced E, increased Chl (a+b) loss, increased the apparent rate of photochemical transport of electrons through PSII (ETR)/PN, as well as a gradual increase in non-photochemical quenching of fluorescence (NPQ) and proline may have contributed to preventing ΦPSII from photodamage. C. korshinskii seedlings used a stress-tolerance strategy, with leaf maintenance providing a clear selective advantage, considering the occasional rainfall events during the growing season. and X. W. Fang ... [et al.].

Language:

Multiple languages

Rights:

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

Coverage:

603-609

Source:

Photosynthetica | 2011 Volume:49 | Number:4

Harvested from:

CDK

Metadata only:

false