Rapid stomatal and photosynthetic responses of <i>Vitis berlandieri</i> leaves after petiole excision in water

Authors

  • H. Düring

DOI:

https://doi.org/10.5073/vitis.1993.32.63-68

Keywords:

Vitis, xylem, water potential, stomatal conductance, photosynthesis

Abstract

Excision of petioles of Vitis berlandieri leaves in water caused a transient decline of stomatal conductance within 30-50 s at high and low leaf water potentials. The time of the subsequent recovery of stomatal conductance to the starting point increased with decreasing leaf water potentials (r = -0.969). R is concluded that the rapid increase of pressure in xylem vessels after excision in water is transmitted directly to the epidermis and the stomata bypassing the mesophyll cells.
The transient decrease of photosynthesis observed briefly after petiole excision in water is caused by pressure changes in xylem and by transient stomatal closure and not - as has been shown for other species - by inhibitory solutes originating from the wounded cells of the petiole. This is demonstrated by (1) the instantaneous reversibility of the transient reactions of stomata and photosynthesis by withholding water, (2) the hydraulic signals moving in apical and basal direction in vines, (3) the photosynthesis to stomatal conductance ratio being constant during the experiment, (4) the determination of the dark respiration which remained constant after excision of petioles.

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Published

2015-09-02

Issue

Vol. 32 No. 2 (1993): Vitis

Section

Article

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