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Gas exchanges of an endangered species Syringa pinnatifolia and a widespread congener S. oblata.
- Source :
- Photosynthetica; Dec2004, Vol. 42 Issue 4, p529-534, 6p
- Publication Year :
- 2004
-
Abstract
- Net photosynthetic rate ( P<subscript>N</subscript>), transpiration rate ( E), water use efficiency (WUE), stomatal conductance ( g<subscript>s</subscript>), and stomatal limitation (L<subscript>s</subscript>) were investigated in two Syringa species. The saturation irradiance (SI) was 400 µmol m<superscript>-2</superscript>s<superscript>-1</superscript> for S. pinnatifolia and 1 700 µmol m<superscript>-2</superscript>s<superscript>-1</superscript> for S. oblata. Compared with S. oblata, S. pinnatifolia had extremely low g<subscript> s</subscript>. Unlike S. oblata, the maximal photosynthetic rate ( P<subscript>max</subscript>) in S. pinnatifoliaoccurred around 08:00 and then fell down, indicating this species was sensitive to higher temperature and high photosynthetic photon flux density. However, such phenomenon was interrupted by the leaf development rhythms before summer. A relatively lower P<subscript>N</subscript> together with a lower leaf area and shoot growth showed the capacity for carbon assimilation was poorer in S. pinnatifolia. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03003604
- Volume :
- 42
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Photosynthetica
- Publication Type :
- Academic Journal
- Accession number :
- 50070499
- Full Text :
- https://doi.org/10.1007/S11099-005-0009-y