GAS EXCHANGE OF WINTER WHEAT AND RYE SEEDLINGS UNDER CHANGING CONDITIONS OF SOIL AND AIR HUMIDITY

During 6 days of water stress and after following rewatering photosynthetic and transpiration rates were measured in air containing 1 and 10 g H2O m−3 for 3 wheat and 3 rye cultivars. From 4th to 6th day of stress both photosynthetic and transpiration rates substantially decreased in air containing...

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Bibliographic Details
Published in:Cereal research communications 1994-01, Vol.22 (4), p.389-395
Main Author: Łoboda, Tadeusz
Format: Article
Language:English
Subjects:
Dehydration
Grana
Humidity
Miscellaneous
Photosynthesis
Plants
Rye
Seedlings
Soil water
Soil water content
Transpiration
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Summary:During 6 days of water stress and after following rewatering photosynthetic and transpiration rates were measured in air containing 1 and 10 g H2O m−3 for 3 wheat and 3 rye cultivars. From 4th to 6th day of stress both photosynthetic and transpiration rates substantially decreased in air containing both 1 and 10 g H2O m−3. In the last day of the experiment all rye cultivars and cv. Grana had positive net photosynthetic rate independently of air humidity, while cvs. Liwilla and Mironowska 808 had higher respiration than photosynthetic rate. Generally photosynthetic rate in the air containing 10 g H2O m−3 was the same from 1st to 3rd day of water stress and higher from 4th to 6th of water stress than in the air containing 1 g H2O m−3. After rewatering partial recovery of photosynthetic rate was observed during several minutes. Transpiration rate was also decreasing from 4th to 6th day of water stress and its rapid increase was observed after rewatering.
ISSN:0133-3720
1788-9170