Why it matters where on a leaf a folivore feeds.

Area of Science:

• Plant biology
• Ecology
• Plant-herbivore interactions

Background:

• Dicot leaf tips often mature before the base.
• Leaf expansion patterns influence responses to damage.

Purpose of the Study:

• To investigate how the location and developmental stage of leaf damage affect final leaf area and plant performance.
• To determine if damage to expanding leaves has greater consequences than damage to mature leaves.

Main Methods:

• Excised circular tissue (3.9 cm²) from the base or tip of expanding or mature tobacco leaves (Nicotiana tabaccum).
• Measured final leaf area, visible damage, and fruit production (number and mass).

Main Results:

• Damage to the base of expanding leaves caused significantly more visible damage than other treatments.
• Removing tissue from the base of expanding leaves reduced final leaf area by ~40% and fruit production by ~35%.
• Damage location and leaf developmental stage critically impact herbivory effects.

Conclusions:

• The location of herbivory on a leaf, relative to its developmental stage, has significant consequences for leaf area development and overall plant performance.
• Understanding leaf ontogeny is crucial for accurately assessing herbivory impact and plant responses in ecological studies.