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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.

Transcription

Transcription

Overview
Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
Transcription Can Produce Different Kinds...

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.

Regulation of Transpiration by Stomata

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.

Water and Mineral Acquisition

Water and Mineral Acquisition

Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.

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Related Experiment Video

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Experimental Design for Laser Microdissection RNA-Seq: Lessons from an Analysis of Maize Leaf Development

Experimental Design for Laser Microdissection RNA-Seq: Lessons from an Analysis of Maize Leaf Development

Published on: March 5, 2017

Extensive tissue-specific transcriptomic plasticity in maize primary roots upon water deficit.

Nina Opitz¹, Caroline Marcon¹, Anja Paschold¹

¹Institute of Crop Science and Resource Conservation, Crop Functional Genomics, University of Bonn, D-53113 Bonn, Germany.

Journal of Experimental Botany

|October 15, 2015

Summary

Maize roots show significant gene expression changes to adapt to water deficit. Most responses are tissue-specific, focusing on transcriptional regulation and hormone metabolism for survival and continued growth.

Keywords:

Drought RNA-Sequencing (RNA-Seq)expression pattern low water potential maize primary root tissue specificity transcriptome water deficit.

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Experimental Design for Laser Microdissection RNA-Seq: Lessons from an Analysis of Maize Leaf Development

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Lateral Root Inducible System in Arabidopsis and Maize

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Imaging and Analysis for Quantifying Maize (Zea mays) Abiotic Stress Phenotypes

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Published on: March 28, 2025

Area of Science:

Plant Biology
Genomics
Agricultural Science

Background:

Water deficit is a major global constraint on crop productivity.
Understanding plant responses to drought is crucial for food security.

Purpose of the Study:

Investigate early transcriptome changes in maize primary roots under water deficit.
Identify tissue-specific gene expression patterns and regulatory mechanisms.

Main Methods:

RNA-Sequencing (RNA-Seq) to analyze gene expression.
Bayesian hierarchical model to determine gene activity status.
Differential gene expression analysis across root tissues.

Main Results:

High plasticity in water deficit response; 70% of genes constitutively active.
Few genes (<3%) consistently regulated across all tissues; most are tissue-specific (>75%).
Key functional categories include transcriptional regulation, hormone metabolism, and cell wall reorganization for root growth.

Conclusions:

Maize exhibits complex, tissue-specific transcriptomic adaptations to water deficit.
Findings provide insights for developing drought-tolerant maize cultivars through genetic strategies.