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| Content Provider | Springer Nature Link |
|---|---|
| Author | Lauria, J.A. Ramalho, J.C. Lidon, F.C. do Céu Matos, M. |
| Copyright Year | 2004 |
| Abstract | The photosynthetic response of three Arachis hypogaea L. cultivars (57-422, 73-30, and GC 8-35) grown for two months was measured under water available conditions, severe water stress, and 24, 72, and 93 h following re-watering. At the end of the drying cycle, all the cultivars reached dehydration, relative water content (RWC) ranging between 40 and 50 %. During dehydration, leaf stomatal conductance (g $_{s}$), transpiration rate (E), and net photosynthetic rate (P $_{N}$) decreased more in cvs. 57-422 and GC 8-35 than in 73-30. Instantaneous water use efficiency (WUE$_{i}$) and photosynthetic capacity (P $_{max}$) decreased mostly in cv. GC 8-35. Except in cv. GC 8-35, the activity of photosystem 1 (PS1) was only slightly affected. PS2 and ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPCO) were the main targets of water stress. After re-watering, cvs. 73-30 and GC 8-35 rapidly regained g $_{s}$, E, and P $_{N}$ activities. Twenty-four hours after re-watering, the electron transport rates and RuBPCO activity strongly increased. P $_{N}$ and P $_{max}$ fully recovered later. Considering the different photosynthetic responses of the studied genotype, a general characterisation of the interaction between water stress and this metabolism is presented. |
| Starting Page | 37 |
| Ending Page | 41 |
| Page Count | 5 |
| File Format | |
| ISSN | 03003604 |
| Journal | Photosynthetica |
| Volume Number | 42 |
| Issue Number | 1 |
| e-ISSN | 15739058 |
| Language | English |
| Publisher | Kluwer Academic Publishers |
| Publisher Date | 2004-01-01 |
| Publisher Place | Dordrecht |
| Access Restriction | Subscribed |
| Subject Keyword | Plant Physiology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Plant Science |
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