Guttation
Understanding guttation as the exudation of xylem sap from hydathodes on leaf margins, distinct from transpiration.
What is Guttation?
The exudation of water in liquid drops from a plant, especially from the edges of leaves.
Key points
- Define guttation and differentiate it from dew.
- Explain the physiological process of guttation.
- Identify the role of root pressure and hydathodes in guttation.
- Understand the composition of guttation fluid.
Common exam trap
Confusing guttation with dew formation.
Definitions
- Term
Guttation
- Meaning
The exudation of water in liquid drops from a plant, especially from the edges of leaves.
- Term
Hydathodes
- Meaning
Specialized pores, typically at the margins of leaves, through which guttation occurs.
- Term
Root Pressure
- Meaning
The positive pressure that develops in the xylem of some plants as a result of active or passive movement of ions into the xylem, which causes water to follow by osmosis.
- Term
Guttation Fluid
- Meaning
The liquid exuded during guttation, essentially xylem sap containing dissolved minerals and organic compounds.
- Term
Dew
- Meaning
A deposit of water droplets formed by condensation of water vapor from the atmosphere on a surface that has cooled below the dew point.
Learning objectives
Define guttation and differentiate it from dew.
Explain the physiological process of guttation.
Identify the role of root pressure and hydathodes in guttation.
Understand the composition of guttation fluid.
Prerequisites
Plant Water Relations
Root Pressure
Transpiration
Structure of a Leaf
Xylem Tissue
Common mistakes
Confusing guttation with dew formation.
Assuming guttation is the same as transpiration.
Underestimating the role of root pressure.
Keywords
Guttation
Hydathodes
Root Pressure
Xylem Sap
Plant Physiology
Water Loss
Herbaceous Plants
Practice preview
Guttation is the process of loss of water in the form of droplets from the plant body. This process occurs through:…
easy
In which of the following plant groups is guttation most commonly observed?…
medium
Which of the following conditions favors guttation?…
easy