Stomatal Ligands
Stomatal Ligands - Related Videos
07:03
Assessing Stomatal Response to Live Bacterial Cells using Whole Leaf Imaging
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Cited by 38 •
2010
We have developed a simple and reproducible protocol to access stomatal response to live bacteria. This method minimizes wounding and manipulation of the leaf as compared to the use of epidermal peels reported previously.
11:09
Relating Stomatal Conductance to Leaf Functional Traits
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Cited by 39 •
2015
Unraveling how physiology and morphology are linked allows a deeper understanding of mechanistic functioning of plant leaves. We present both a procedure to derive parameters of stomatal regulation from stomatal conductance measurements and correlations with traditional functional leaf traits.
02:40
Ligand Binding Sites
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2020
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands. Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
02:51
Metal-Ligand Bonds
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2020
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes. In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
00:49
Ligand Binding and Linkage
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2020
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...
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Abscisic acid (ABA) triggers a receptor-linked phosphorylation relay in guard cells. After ABA binds a PYR/PYL receptor, PP2C phosphatase inhibition permits SnRK2 kinase activation. The kinase then promotes ion efflux, reducing guard-cell turgor and driving pore closure. This sequence explains how ligand recognition becomes a rapid adjustment of gas exchange and water loss.
Specific receptor binding gives signaling molecules distinct entry points into plant responses. ABA uses PYR/PYL receptors in guard cells, linking its signal to pore closure, whereas peptide signals can influence stomatal spacing and formation in the epidermis. This separation allows ligand activity to regulate both immediate stomatal behavior and longer-term patterning.
Peptide signals and abscisic acid act on different biological timescales and targets described in this system. ABA signaling in guard cells changes pore status through PP2C and SnRK2 components, while peptide signals influence where stomata form and how they are spaced across the epidermis. Comparing them connects physiological control with developmental patterning.
Drought, humidity, carbon dioxide concentration, and pathogen exposure provide important contexts for examining ligand activity. These conditions are relevant because stomata must balance carbon dioxide uptake with water loss while responding to environmental stress. Studying signaling under these contexts can reveal how plants coordinate pore behavior with changing external demands.
Research on stomatal ligands can inform studies of water-use efficiency, crop resilience, and plant adaptation. Understanding how receptor pathways alter pore closure or how peptide signals shape stomatal distribution may help explain differences in plant responses to water limitation and other stresses. These findings provide biological context for improving knowledge of stress adaptation.
A useful biological analysis considers both immediate and developmental outcomes: ligand signaling may alter stomatal opening or closure in guard cells, or affect spacing and formation in the epidermis. Researchers can then relate these outcomes to drought, humidity, carbon dioxide, or pathogens to interpret how plants regulate gas exchange and adapt to their environment.