Original video: https://youtu.be/0-YCZLpJVk8
Delivered on: 07 NOVEMBER 2022
This in-depth video explores the fascinating world of plant signaling and signal transduction, the intricate processes that allow plants to perceive and respond to their environment. 🌿 We'll delve into the complex mechanisms by which plants receive, process, and react to various internal and external cues.
What you'll learn:
Signal Transduction Overview: We'll define signal transduction and its importance in plant life, highlighting how it enables plants to adapt and thrive in changing conditions.
Types of Signals: Explore the diverse range of signals that plants perceive, including environmental cues (light, temperature, touch), developmental signals, and more.
Receptors: Learn about the various types of receptors that plants use to detect signals, including kinases, G protein-coupled receptors, and ion channels.
Signal Transduction Pathways: We'll examine the key steps involved in signal transduction, from receptor activation to cellular responses, including phosphorylation cascades, second messengers, and gene expression changes.
Response Timescales: Understand the different timescales of plant responses, from rapid movements (e.g., Venus flytrap closing) to long-term growth adjustments.
Cell-Autonomous vs. Non-Cell-Autonomous Responses: We'll differentiate between responses that occur within a single cell and those that involve communication between cells or tissues.
Examples of Signal Transduction in Plants: We'll discuss specific examples of signal transduction pathways in plants, including those involved in cell elongation, defense responses, and stomatal regulation.
Plants, being sessile organisms, must constantly adapt to their environment to thrive and survive. To achieve this, they have developed intricate sensory systems that allow them to optimize resource usage, monitor light conditions, and defend against threats. Charles and Francis Darwin were pioneers in understanding plant signal transduction through their studies on the bending growth of grass coleoptiles in response to light. They observed that the light signal was perceived at the coleoptile tip, but the bending occurred lower down, suggesting a mobile signal transferred information within the plant. This mobile signal was later identified as auxin, the first plant hormone discovered.
In the context of plant signaling, a signal is any environmental input that triggers a response, while a receptor is the physical component, usually a protein or pigment, that perceives the signal. Upon sensing a signal, the receptor must transduce it, converting it into a different form to amplify the signal and initiate a cellular response. This often involves modifying protein activity or employing second messengers, which can alter processes like gene transcription. Therefore, a typical signal transduction pathway follows the sequence: signal → receptor → signal transduction → response.
Often, the initial response generates secondary signals, such as hormones, that travel to other parts of the plant to evoke the main physiological response. The specific steps and molecules involved in these processes constitute the signal transduction pathways, and our understanding of these pathways continues to expand.
Overview Slides: ADVANCED CROP PHYSIOLOGY AGR4301 FALL- 2022
Keywords: Plant physiology, signal transduction, plant signals, receptors, kinases, phosphorylation, second messengers, gene expression, cell-autonomous, non-cell-autonomous, plant responses, environmental cues, developmental signals
Location:
Faculty of Agriculture, Universiti Putra Malaysia
Fakulti Pertanian, Universiti Putra Malaysia, 43000 Seri Kembangan, Selangor
XPMM+9J Seri Kembangan, Selangor
2.9845517506267742, 101.73803356324866
Attribution 4.0 International — CC BY 4.0 - Creative Commons
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