Plant Physiol.
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Plant Physiology 69:1051-1054 (1982)
© 1982 American Society of Plant Biologists

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Articles

Leaf Water Potential, Stomatal Resistance, and Photosynthetic Response to Water Stress in Peach Seedlings 1

J. Mark Hand, Eric Young2 and Aurea C. Vasconcelos3

Department of Horticulture and Forestry, New Jersey Agricultural Station, Rutgers University, New Brunswick, New Jersey 08903, Department of Biological Sciences—Botany Unit, Rutgers University, Nelson Biological Laboratories, Piscataway, New Jersey 08854

Individual groups of peach (Prunus persica [L.] Batsch) seedlings stressed to –17, –26 and –36 bars recovered to control levels within 1, 3, and 4 days, respectively. Stomatal resistance was significantly correlated with both leaf water potential and net photosynthesis. In seedlings stressed to –52 bars, leaf water potential and stomatal resistance recovered sooner than net photosynthesis, despite recovery of 02 evolution at a rate similar to leaf water potential. Therefore, some nonstomatal factor other than reduction in photochemical activity must be responsible for the lag in recovery of CO2 assimilation following irrigation.

2 Present Address: Department of Horticultural Science, North Carolina State University, Raleigh, NC 27650.

3 To whom requests for reprints should be addressed.

1 Supported by the New Jersey Agricultural Experiment Station. This work was performed as part of NJAES Project No. 12121.






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Copyright © 1982 by the American Society of Plant Biologists