We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Effect of nitrogen application and elevated CO<sub>2</sub> on photosynthetic gas exchange and electron transport in wheat leaves.
- Authors
Zhang, X. C.; Yu, X. F.; Ma, Y. F.
- Abstract
Nitrogen (N) availability is a critical factor affecting photosynthetic acclimation of C 3 plants under elevated atmospheric CO 2 concentration ([CO 2] e). However, current understanding of N effects on photosynthetic electron transport rate and partitioning, as well as its impact on photosynthesis under [CO 2] e, is inadequate. Using controlled environment open-top chambers, wheat ( Triticum aestivum L.) was grown at two N levels (0 and 200 mg(N) kg −1 soil) and two atmospheric CO 2 concentrations of 400 ([CO 2] a) and 760 μmol mol −1([CO 2] e) during 2009 and 2010. Under [CO 2] e high N availability increased stomatal conductance and transpiration rate, reduced limitations on the activity of triose phosphate isomerase, a Calvin cycle enzyme, and increased the rate of net photosynthesis ( PN). Considering photosynthetic electron transport rate and partitioning aspects, we suggest that greater N availability increased PN under [CO 2] e due to four following reasons: ( 1) higher N availability enhanced foliar N and chlorophyll concentrations, and the actual photochemical efficiency of photosystem (PS) II reaction centers under irradiance increased, ( 2) increase of total electron transport rate and proportion of open PSII reaction centers, ( 3) enhancement of the electron transport rate of the photochemical and carboxylation processes, and ( 4) reduced limitations of the Calvin cycle enzymes on the photosynthetic electron transport rate. Consequently, sufficient N improved light energy utilization in wheat flag leaves under [CO 2] e, thus benefiting to photosynthetic assimilation.
- Subjects
EFFECT of carbon dioxide on plants; EFFECT of nitrogen on plants; PHOTOSYNTHESIS; GAS exchange in plants; ELECTRON transport; WHEAT; PHYSIOLOGY; PLANTS
- Publication
Photosynthetica, 2013, Vol 51, Issue 4, p593
- ISSN
0300-3604
- Publication type
Article
- DOI
10.1007/s11099-013-0059-5