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Responses to Drought and Flooding

Responses to Drought and Flooding

Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.

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Regulation of Transpiration by Stomata

During photosynthesis, plants acquire the necessary carbon dioxide and release the produced oxygen back into the atmosphere. Openings in the epidermis of plant leaves is the site of this exchange of gasses. A single opening is called a stoma—derived from the Greek word for “mouth.” Stomata open and close in response to a variety of environmental cues.

Adaptations that Reduce Water Loss

Adaptations that Reduce Water Loss

Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.

Responses to Salt Stress

Responses to Salt Stress

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Responses to Heat and Cold Stress

Responses to Heat and Cold Stress

Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.

Riboswitches

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Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...

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Updated: Jun 14, 2026

A Flexible Low Cost Hydroponic System for Assessing Plant Responses to Small Molecules in Sterile Conditions

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Published on: August 25, 2018

SlROP4 negatively regulates drought tolerance in tomato.

Chao Cheng¹, Min Li¹, Bing Sun¹

¹State Key Laboratory of Wheat Improvement, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China.

Plant Science : an International Journal of Experimental Plant Biology

|June 12, 2026

Summary

Researchers identified SlROP4 in tomato, a gene crucial for drought response. Modulating SlROP4 enhances drought tolerance in tomato plants by improving water retention and reducing oxidative damage, suggesting it as a target for crop improvement.

Keywords:

Drought tolerance ROP ROS Stomata Tomato

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Last Updated: Jun 14, 2026

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Tomato Root Transformation Followed by Inoculation with Ralstonia Solanacearum for Straightforward Genetic Analysis of Bacterial Wilt Disease

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Published on: March 11, 2020

Area of Science:

Plant Biology
Molecular Biology
Genetics

Background:

Rho-like GTPases of plants (ROPs) are vital regulators of plant cellular processes.
The specific functions of ROPs in tomato (Solanum lycopersicum) drought responses remain largely unexplored.

Purpose of the Study:

To investigate the role of ROP genes, particularly SlROP4, in tomato drought tolerance.
To determine if SlROP4 can be a target for enhancing drought resilience in tomato.

Main Methods:

Identification and characterization of nine ROP genes in tomato.
Expression analysis and subcellular localization of SlROP4.
Generation and physiological assessment of transgenic tomato plants expressing a dominant-negative SlROP4 (SlROP4^DN) under drought stress.
Measurement of reactive oxygen species, malondialdehyde, and antioxidant enzyme activities.
Evaluation of abscisic acid (ABA) sensitivity and ABA-responsive gene expression.

Main Results:

SlROP4 was highly expressed, localized to the plasma membrane, and induced by drought stress.
SlROP4^DN transgenic tomato plants displayed enhanced drought tolerance, showing improved growth, water content, and chlorophyll retention.
These plants exhibited reduced oxidative damage (lower ROS and MDA levels) without altered antioxidant enzyme activity.
SlROP4^DN plants demonstrated increased sensitivity to ABA, including enhanced stomatal closure and upregulated ABA-responsive genes.

Conclusions:

SlROP4 plays a significant role in modulating drought tolerance in tomato.
Targeting SlROP4 presents a promising strategy for developing drought-resilient tomato varieties.