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Related Experiment Video

Updated: Jun 25, 2026

A Strategy to Validate the Role of Callose-mediated Plasmodesmal Gating in the Tropic Response

A Strategy to Validate the Role of Callose-mediated Plasmodesmal Gating in the Tropic Response

Published on: April 17, 2016

Ethylene plays multiple nonprimary roles in modulating the gravitropic response in tomato.

A Madlung¹, F J Behringer, T L Lomax

¹Department of Botany and Plant Pathology, Oregon State University, Corvallis 97331-2902, USA.

Plant Physiology

|July 10, 1999

Summary

This summary is machine-generated.

Ethylene

Keywords:

NASA Discipline Plant Biology Non-NASA Center

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Area of Science:

Plant Biology
Plant Physiology
Hormone Signaling

Background:

Ethylene and auxin are known to interact in stem growth regulation.
The role of ethylene in tropic responses, particularly gravitropism, remains unclear with conflicting evidence.
Understanding these interactions is crucial for plant development research.

Purpose of the Study:

To investigate the concentration-dependent effects of ethylene on shoot gravitropism in tomato.
To elucidate the specific roles of ethylene in mediating the gravitropic response using various mutants.
To differentiate ethylene's effect on gravicurvature from its general impact on growth.

Main Methods:

Analysis of four tomato mutants (dgt, nr, epi, lz-2) with altered responses to gravity, auxin, and/or ethylene.
Application of ethylene inhibitors and controlled low ethylene concentrations.
Observation and quantification of shoot gravicurvature under different hormonal and light conditions.

Main Results:

Ethylene inhibitors reduced wild-type shoot gravitropism.
Extremely low ethylene concentrations restored gravitropism in auxin-resistant mutants (dgt).
Moderate ethylene concentrations inhibited gravicurvature in most mutants, except the ethylene-insensitive nr mutant, indicating a specific inhibitory role.

Conclusions:

Ethylene is not the primary driver of shoot gravitropism in tomato but plays a necessary role at low concentrations for a full response.
Moderate ethylene levels specifically inhibit gravicurvature, distinct from its general growth inhibition.
Ethylene's influence on gravitropism is concentration-dependent and modulated by other hormones like auxin.