This preview shows page 1. Sign up to view the full content.
Unformatted text preview: itation rocks! Water Stress Text • Effects on
– Stem hydraulic
• Measure of how readily
water moves in the
• As stem water potential
decreases due to
Water Stress Cavitation = event of water vapor filling a vessel
Embolism = result -> a gas bubble that fills the vessel
When water potential is negative enough cavitation
Results in loss of conductance (and flow) of cavitated
the noise is due to the formation of water vapor bubble, due to the xylem cavitating, due to water
stress. basically water vapor bubble is building up in the xylem. this causes the ﬂow of the water
and more water stress. at night the plant can have a positive pressure and it can get rid of the bubble root pressure is one way to get rid of the bubbles and that is basically during the night
that is why you see the water drops on the corner of the leaves called guttation. More about embolism and repair
Xylem under repair from embolism
suppl/bff1fe3531cea979/suppl/DC1 so basically there is a trigger and
that trigger will tell the nucleus to...
View Full Document
This document was uploaded on 01/17/2014.
- Winter '08