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Plant Hormones

Plant Hormones

Plant hormones—or phytohormones—are chemical molecules that modulate one or more physiological processes of a plant. In animals, hormones are often produced in specific glands and circulated via the circulatory system. However, plants lack hormone-producing glands.

Short-distance Transport of Resources

Short-distance Transport of Resources

Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.

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.

Morphogenesis

Morphogenesis

Plant morphogenesis—the development of a plant’s form and structure—involves several overlapping developmental processes, including growth and cell differentiation. Precursor cells differentiate into specific cell types, which are organized into the tissues and organ systems that make up the functional plant.

Cell Signaling in Plants

Cell Signaling in Plants

Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...

Responses to Salt Stress

Responses to Salt Stress

Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.

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Related Experiment Video

Updated: Oct 9, 2025

A Simple Protocol for Mapping the Plant Root System Architecture Traits

A Simple Protocol for Mapping the Plant Root System Architecture Traits

Published on: February 10, 2023

Nutrient-hormone relations: Driving root plasticity in plants.

Zhongtao Jia¹, Ricardo F H Giehl¹, Nicolaus von Wirén¹

¹Molecular Plant Nutrition, Department of Physiology & Cell Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, 06466 Stadt Seeland, OT Gatersleben, Germany.

Molecular Plant

|December 17, 2021

Summary

Plants adjust root architecture to absorb essential minerals, using phytohormones to signal nutrient availability and demand. This review explores nutrient-hormone signaling in plant root development.

Keywords:

nutrient sensing nutrient signaling nutrient use efficiency plant hormones root development root plasticity

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Area of Science:

Plant Biology
Nutrient Signaling
Root Development

Background:

Plant development relies on absorbing 14 essential mineral nutrients from soil.
Nutrient bioavailability varies, necessitating dynamic root system adjustments for optimal acquisition.
Plants integrate external nutrient cues and internal demand via signaling pathways.

Purpose of the Study:

To review nutrient sensing and signaling events in plants.
To highlight the role of phytohormones in mediating root developmental plasticity.
To explore nutrient-hormone relationships coordinating root growth.

Main Methods:

Literature review of nutrient sensing and signaling pathways.
Analysis of phytohormone involvement in plant development.
Examination of long-distance signaling from shoots to roots.

Main Results:

Nutrient availability and plant demand trigger cellular signals involving phytohormones.
Systemic signals from shoots and local nutrient cues are integrated to control root growth.
Phytohormone-mediated signaling dictates cell division, elongation, and root hair formation.

Conclusions:

Nutrient-hormone interactions are crucial for coordinating root developmental plasticity.
Understanding these signaling cascades enhances knowledge of plant adaptation to nutrient availability.
This review provides insights into the molecular mechanisms governing root system architecture.