The photosynthetic response of the perennial ryegrass (Lolium perenne) in its fifth year of free-air CO(sub 2) enrichment (FACE) at Eschikon, Switzerland [electronic resource].
- Published
- Washington, D.C. : United States. Dept. of Energy. Office of Energy Research, 1998.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Physical Description
- 65 pages : digital, PDF file
- Additional Creators
- Brookhaven National Laboratory, United States. Department of Energy. Office of Energy Research, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online
- Restrictions on Access
- Free-to-read Unrestricted online access
- Summary
- Stands of Ryegrass (Lolium perenne L. cv.Bastion) were grown in the field at ambient or elevated (600 {micro}mol mol{sup −1}) [CO₂], high (560 kg Ha{sup −1} y{sup −1}) or low (140 kg Ha{sup −1} y{sup −1}) nitrogen addition and were harvested five times a year during the growing season. The plants were sown during 1992, additional plots being sown during 1995. These were in their fifth year and second year of growth respectively. Exposure to elevated [CO₂] was carried out with a Free-Air CO₂ Enrichment (FACE) system which provides the most realistic system of fumigation currently available. Elevated [CO₂] increased diurnal CO₂ uptake by between 40 to 83% while reducing stomatal conductance by between 1 and 38% in all of the 1992 grown plants measured at high [CO₂]. Analysis of the A/c{sub i} response of 1992 grown plants showed no acclimation of the photosynthetic apparatus in response to elevated [CO₂] - both V{sub c,max} (a measure of the maximum in vivo rate of carboxylation) and J{sub max} (a measure of the maximum capacity for the regeneration of RuBP) showed no significant change during any of the periods of regrowth. In contrast the leaves of 1995 grown plants, appeared to be experiencing an acclimatory change in their photosynthetic apparatus in response to elevated [CO₂]. However, this negative response seemed to be removed directly after a harvest when the source:sink balance had increased. The apparent lack of an acclimatory response after almost 5 years of growth at elevated [CO₂], suggests that L. perenne may be close to achieving the appropriate photosynthetic adjustments which would allow it to attain a significantly higher photosynthetic potential.
- Report Numbers
- E 1.99:bnl-66151
E 1.99: kp-12-03-02
kp-12-03-02
bnl-66151 - Subject(s)
- Other Subject(s)
- Note
- Published through SciTech Connect.
12/31/1998.
"bnl-66151"
" kp-12-03-02"
"KP-12-03-02"
Williams, J.; Anderson, J.P.; Long, S.P. - Type of Report and Period Covered Note
- Topical;
- Funding Information
- AC02-98CH10886
AS-159-EBID
View MARC record | catkey: 14447940