ISHS Acta Horticulturae 493: I ISHS Workshop on Water Relations of Grapevines
EFFECTS OF TWO LEVELS OF WATER SUPPLY ON THE PHOTOSYNTHESIS AND THE TRANSPIRATION OF A WHOLE GRAPEVINE (VITIS VINIFERA, C.V. CABERNET SAUVIGNON) |
| Authors: | N. Ollat, J. Tandonnet |
| Keywords: | gas exchange, irrigation, water use efficiency, water stress |
| Abstract:
In order to analyse the relationships between grapevine water status and productivity, we measured the gas exchanges of whole vines in the vineyard. Shortly after the application of the two levels of water supply, the gas exchanges were identical for both treatments. One month later, the photosynthetic activity and the transpiration of the irrigated vine increased in the morning until around 10 am (solar time) and decreased with solar radiation at the end of the afternoon. The gas exchanges of the stressed vine increased sharply in the morning, reached a higher maximal level than the irrigated vine and started to decrease immediately. The water use efficiency was much higher for the stressed vine. Our results show that irrigated vines use as much water as available without any strong effects on their carbon balance. The stressed vines save water and keep very efficient photosynthetic potentialities. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
