# Volatile Organic Compound Emissions From Solidago altissima Under Experimental Warming and Drought

## TL;DR

This study shows that drought has a stronger effect than warming on the chemical emissions of goldenrod plants, which could impact plant interactions and ecosystem health.

## Contribution

The study experimentally demonstrates the differential effects of drought and warming on VOC emissions in a natural plant community.

## Key findings

- Drought treatments had a stronger effect on VOC emissions than warming treatments.
- Specific compounds, like diisopropyl adipate, were more abundant under drought and warmed + drought conditions.
- Climate change alters VOC emissions, potentially affecting plant communication and ecosystem functioning.

## Abstract

Plant volatile organic compound (VOC) emissions are important mediators for plant interactions with biotic and abiotic factors in the environment. Changes in VOC emissions can be caused by factors associated with climate change, such as warming and drought. However, we currently lack an understanding of how warming and drought affect plants' emissions in their natural environment, let alone how these climate factors may interact to synergistically affect emissions. To fill these knowledge gaps, we measured VOC emissions from tall goldenrod (
Solidago altissima
) in an early successional plant community under four climate treatments: ambient control, warmed, drought, and warmed + drought. Treatments were applied in situ using open‐top chambers for warming and rainout shelters for drought. Drought treatments (drought and warmed + drought) have a stronger effect on VOC emissions compared to nondrought treatments (ambient and warmed). Furthermore, while the overall abundance of VOCs did not differ between treatments, there were specific compounds associated with one or more climate treatments. For example, diisopropyl adipate was more abundant in the drought and warmed + drought treatments. Our study shows that in goldenrod, drought may have a stronger effect than warming on VOC emissions, but moreover, that specific compounds are especially sensitive to certain climate treatments. However, additional experimentation is necessary to validate the functions associated with the affected compounds. These findings demonstrate that climate change alters chemical emissions, which in turn could have implications for ecosystem functioning via changes in plant–plant communication, plant–insect interactions, and overall plant fitness.

Drought has a greater impact than warming on the VOC emissions of
Solidago altissima
. Additionally, a few specific compounds are particularly affected by these climate treatments, which may influence plant functioning through changes in stress protection mechanisms.