Photosynthetic response to precipitation/rainfall in predominant tree (Ulmus pumila) seedlings in Hunshandak Sandland, China

Title:

Photosynthetic response to precipitation/rainfall in predominant tree (Ulmus pumila) seedlings in Hunshandak Sandland, China

Creator:

Li, Y.-G., Jiang, G.-M., Liu, M.-Z., Niu, S.-L., Gao, L.-M., and Cao, X.-C.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:38a842b1-4854-4723-924b-d45048324f31
uuid:38a842b1-4854-4723-924b-d45048324f31
issn:0300-3604
doi:10.1007/s11099-007-0021-5

Subject:

drought stress, leaf water potential, maximum photochemical efficiency, and water use efficiency

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

The responses of gas exchange and chlorophyll fluorescence of field-growing Ulmus pumila seedlings to changes in simulated precipitation were studied in Hunshandak Sandland, China. Leaf water potential (Ψwp), net photosynthetic rate (PN), stomatal conductance (gs), and transpiration rate (E) were significantly increased with enhancement of precipitation from 0 to 20 mm (p<0.01), indicating stomatal limitation of U. pumila seedlings that could be avoided when soil water was abundant. However, PN changed slightly when precipitation exceeded 20 mm (p>0.05), indicating more precipitation than 20 mm had no significant effects on photosynthesis. Maximum photochemical efficiency of photosystem 2, PS 2 (Fv/Fm) increased from 0.53 to 0.78 when rainfall increased from 0 to 10 mm, and Fv/Fm maintained a steady state level when rainfall was more than 10 mm. Water use efficiency (WUE) decreased significantly (from 78-95 to 23-27 µmol mol-1) with enhancement of rainfalls. PN showed significant linear correlations with both gs and Ψwp (p<0.0001), which implied that leaf water status influenced gas exchange of U. pumila seedlings. The 20-mm precipitation (soil water content at about 15 %, v/v) might be enough for the growth of elm seedlings. When soil water content (SWC) reached 10 %, down regulation of PS2 photochemical efficiency could be avoided, but stomatal limitation to photosynthesis remained. When SWC exceeded 15 %, stomatal limitation to photosynthesis could be avoided, indicating elm seedlings might tolerate moderate drought. and Y.-G. Li ... [et al.].

Language:

Multiple languages

Rights:

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

Coverage:

133-138

Source:

Photosynthetica | 2007 Volume:45 | Number:1

Harvested from:

CDK

Metadata only:

false