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| Content Provider | Springer Nature Link |
|---|---|
| Author | Jiang, G.M. Zhu, G.J. |
| Copyright Year | 2001 |
| Abstract | Field studies of gas exchange and chlorophyll fluorescence of three desert shrub species, Hedysarum fruticosum var. mongolicum, Artemisia ordosia, and Salix pasmmophylla, showed different patterns under different leaf temperature (T$_{1}$) and incident photosynthetic photon flux density (PPFD). H. fruticosum var. mongolicum and A. ordosia exhibited higher P $_{N}$ and g $_{s}$ than S. pasmmophylla, especially under very high T$_{1}$ (>46 °C) and high PPFD (>2 100 µmol m$^{−2}$ s$^{−1}$) in hot summer. The decreases of P $_{N}$ with the diurnal course were due mainly to stomata closure. However, P $_{N}$ of S. pasmmophylla was seriously depressed by very high temperature from midday to evening as shown by the negative P $_{N}$ in hot summer, whereas none of such depression was found in spring. Maximal spring photochemical efficiency of photosystem 2 (PS2), i.e, F$_{v}$/F$_{m}$, was the lowest at 16:00, indicating the injury of PS2 by heat at this stage. In hot summer again, all the three shrubs underwent pronounced midday depression of P $_{N}$ and g $_{s}$, while in spring they showed a one-peak response. And the first peak appeared 2 h earlier in hot summer than in spring for all the three shrubs. It was the high temperature that led to the different patterns of gas exchange and the serious depression of P $_{N}$ in S. pasmmophylla. H. fruticosum var. mongolicum and A. ordosia were much more tolerant to heat and high irradiance than S. pasmmophylla, which fixed most of CO$_{2}$ at the fast growing stage in spring. Nevertheless, in hot summer it had to survive the severe hot environment through strong respiration and storage of CO$_{2}$ only in the early morning. |
| Starting Page | 257 |
| Ending Page | 262 |
| Page Count | 6 |
| File Format | |
| ISSN | 03003604 |
| Journal | Photosynthetica |
| Volume Number | 39 |
| Issue Number | 2 |
| e-ISSN | 15739058 |
| Language | English |
| Publisher | Kluwer Academic Publishers |
| Publisher Date | 2001-01-01 |
| Publisher Place | Dordrecht |
| Access Restriction | Subscribed |
| Subject Keyword | Plant Physiology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Plant Science |
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