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Image Title: Vessel contents in the petiole of a transpiring sunflower leaf
Image Credit: Martin J. Canny, Carleton University
AJB Editor: Karl Niklas, Cornell University
Intended End User: Teacher, Student
License Details: BSA - Terms for Image Use
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About the Image

Vessel contents in the petiole of a transpiring sunflower leaf. Vessels containing water shown in green, gas spaces (embolisms) in red. Some vessels are completely embolized, others contain varying amounts of water as well as gas. The proportion of embolized vessels was followed during a day's transpiration. Petioles were snap-frozen intact on the transpiring plant, and viewed, still frozen, in the cryo-scanning microscope.

Link to the AJB Abstract for the article:

Vessel contents of leaves after excision-a test of Scholander's assumption,and Vessel contents during transpiration-embolisms and refilling

National Science Foundation  Development Supported by the National Science Foundation