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Plant Hormones01:56

Plant Hormones

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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.
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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...
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Hormones are classified into four main groups: steroids, eicosanoids, amino acid-based derivatives, and peptide hormones.
Steroids and eicosanoids fall under the category of lipid-soluble hormones. Steroids are derived from cholesterol and feature four interconnected carbon rings with variable side chains. Notable examples include estradiol from ovaries and testosterone from testes, exemplifying the critical roles of these lipid-soluble hormones in reproductive physiology. Eicosanoids, derived...
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Secondary Messengers in Hormone Action01:26

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Water-soluble hormones cannot cross the plasma membrane, so they rely on protein receptors that span the membrane to trigger intracellular signaling pathways. These pathways then activate second messengers inside the cell, including cAMP or calcium ions.
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Hormones of the Pituitary Gland01:27

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The small, pea-sized pituitary gland is located at the base of the brain. It is crucial in regulating various bodily functions, from growth to reproduction. The gland is divided into the anterior lobe and the posterior lobe. The secretory cell clusters in the pars distalis of the anterior pituitary lobe are controlled by hypothalamic regulators and synthesize six primary hormones.
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A signaling cascade is a series of events that facilitates the transmission of information within or between cells, culminating in a targeted response in the recipient cell. As chemical messengers, hormones are pivotal in initiating and modulating these intricate signaling cascades based on their solubility.
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Peptide-derived Method to Transport Genes and Proteins Across Cellular and Organellar Barriers in Plants
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Peptide-derived Method to Transport Genes and Proteins Across Cellular and Organellar Barriers in Plants

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Peptide hormones in plants.

Zhenbiao Zhang1, Huibin Han2, Junxiang Zhao3

  • 1Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, 266101, China.

Molecular Horticulture
|January 24, 2025
PubMed
Summary
This summary is machine-generated.

Plant peptide hormones are crucial signaling molecules regulating growth and development. This review details their discovery, functions, and the underlying molecular mechanisms in plants.

Keywords:
Peptide hormonesPost-translational modificationsProteolytic processingReceptor-like kinaseSecretionsSignal transductions

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Area of Science:

  • Plant molecular biology
  • Plant signaling pathways
  • Endocrinology

Background:

  • Peptide hormones are small secreted polypeptides facilitating intercellular communication.
  • They are synthesized from nuclear genes and undergo complex processing.
  • Their discovery in plants, starting with systemin, revealed widespread roles in plant life.

Purpose of the Study:

  • To provide a comprehensive overview of plant peptide hormones.
  • To discuss their discoveries, chemical properties, and regulatory mechanisms.
  • To highlight recent advances in receptor kinases and signaling pathways.

Main Methods:

  • Literature review and synthesis of existing research.
  • Analysis of discoveries and functional roles of plant peptide hormones.
  • Compilation of information on transcriptional and post-translational modifications.

Main Results:

  • Plant peptide hormones regulate diverse processes including development, reproduction, and stress responses.
  • Identification of numerous peptide hormones across plant species.
  • Advances in understanding receptor-mediated sensing and downstream signaling.

Conclusions:

  • Plant peptide hormones are essential for intricate signaling networks.
  • Continued research is vital for understanding their full potential in agriculture and plant science.
  • Future research directions and challenges in the field were discussed.