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Acclimation of photosynthesis in Zea mays to low water potentials involves alterations in protoplast volume reduction |
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| Authors: | Gerald A Berkowitz Kim S Kroll |
| Institution: | (1) Department of Horticulture and Forestry, Cook College-Rutgers, The State University of New Jersey, 08903 New Brunswick, NJ, USA;(2) Department of Soils and Crops, Cook College-Rutgers, The State University of New Jersey, 08903 New Brunswick, NJ, USA |
| Abstract: | Effects of water-stress treatment of Zea mays L. plants on protoplast volume and photosynthesis in leaf slices exposed to solutions of different osmotic potential (
s) were studied. Decreased photosynthetic capacity in the leaf slices at low tissue
w was associated with dehydration-induced protoplast-volume reduction. Leaf slices from plants exposed to in-situ water deficits exhibited greater photosynthetic capacity and relative protoplast volume at low water potential (
w) invitro than tissue from control plants.In-situ water stress induced osmotic adjustment of the leaf tissue as determined by pressure/volume analysis. It is concluded that plant acclimation to low leaf
w may involve a reduced degree of cell shrinkage at a given
w. This acclimation would allow for the maintenance of relatively higher photosynthetic capacity at low water protentials.Symbols
s
Osmotic potential
-
w
water potential
New Jersey Agricultural Experiment Station Publication No. 12149-6-87 |
| Keywords: | Acclimation to water stress Osmotic adjustment Photosynthesis and water stress Water stress Zea (photosynthesis water stress) |
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