Related Experiment Video
Updated: Jun 26, 2025
11:01
Monitoring Plant Hormones During Stress Responses
Published on: June 15, 2009
16.6K
Phytohormone profiling in an evolutionary framework
Vojtěch Schmidt1,2, Roman Skokan3, Thomas Depaepe4
1Institute of Experimental Botany of the Czech Academy of Sciences, Rozvojová 263, 165 02, Prague 6, Czechia.
Nature Communications
|May 8, 2024
Summary
Phytohormones like auxin and cytokinins are widespread in green algae (Viridiplantae), challenging previous assumptions about their absence. This study reveals key differences in phytohormone profiles between algae and land plants.
Area of Science:
- * Plant biology
- * Biochemistry
- * Evolutionary biology
Background:
- * Charophyte green algae are closely related to land plants.
- * Phytohormone regulation is typically absent in charophyte genomes.
- * Endogenous phytohormone production has been sporadically reported in these algae.
Purpose of the Study:
- * To comprehensively analyze multiple phytohormones in Viridiplantae, with a focus on charophytes.
- * To investigate the presence and distribution of phytohormones across green algae and land plants.
- * To understand phytohormone biosynthesis and metabolism in Streptophyta.
Main Methods:
- * Analysis of multiple phytohormones in established algal cultures.
- * Comparative analysis across Viridiplantae, focusing on charophytes and land plants.
- * Phylogenetic guidance for data interpretation.
Main Results:
- * Auxin, salicylic acid, ethylene, and cis-zeatin cytokinins are ubiquitous in Viridiplantae.
- * Land plants possess trans-zeatin cytokinins and conjugates, absent in green algae.
- * Charophytes produce jasmonates and abscisic acid occasionally; land plants consistently produce abscisic acid.
- * Phytohormones like auxin, cytokinins, and salicylic acid are excreted into culture media.
Conclusions:
- * Phytohormone biosynthesis and signaling pathways in angiosperms do not fully align with the observed capacities in Viridiplantae.
- * The study provides insights into phytohormone evolution and metabolism across Streptophyta.
- * Findings challenge the notion of phytohormone absence in early plant relatives.
More Related Videos
Related Concept Videos
01:56Plant Hormones
23.9K
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.
23.9K
01:25Cell Signaling in Plants
5.6K
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...
5.6K
02:05Gene Evolution - Fast or Slow?
7.1K
The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
In contrast, regions which code...
7.1K
02:19Morphogenesis
28.1K
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.
28.1K
02:45Biological Clocks and Seasonal Responses
34.6K
The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
34.6K
02:54Evolutionary Relationships through Genome Comparisons
5.7K
Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
5.7K