Modern concepts of auxin’s action. 2. Mechanisms of auxin signal transduction and physiological action

2021 ◽  
Vol 2021 (3) ◽  
pp. 98-137
Author(s):  
V. Y. Dzhamieiev ◽  
Keyword(s):  
Signal Transduction ◽  
Physiological Action ◽  
Auxin Signal Transduction

ChemInform Abstract: Yokonolide A, a New Inhibitor of Auxin Signal Transduction, from Streptomyces diastatochromogenes B59.

ChemInform ◽  
2010 ◽  
Vol 33 (3) ◽  
pp. no-no
Author(s):  
Ken-ichiro Hayashi ◽  
Kentaro Ogino ◽  
Yutaka Oono ◽  
Hirofumi Uchimiya ◽  
Hiroshi Nozaki
Keyword(s):  
Signal Transduction ◽  
Streptomyces Diastatochromogenes ◽  
Auxin Signal Transduction

scholarly journals A SNP Mutation of SiCRC Regulates Seed Number Per Capsule and Capsule Length of cs1 Mutant in Sesame

2019 ◽  
Vol 20 (16) ◽  
pp. 4056
Author(s):  
Libin Wei ◽  
Chun Li ◽  
Yinghui Duan ◽  
Wenwen Qu ◽  
Huili Wang ◽  
...  
Keyword(s):  
Signal Transduction ◽  
Transcription Factor ◽  
Signal Transduction Pathway ◽  
Gene Interaction ◽  
Transduction Pathway ◽  
Seed Number ◽  
Mechanism Study ◽  
Mutant Type ◽  
Genome Screening ◽  
Auxin Signal Transduction

Seed number per capsule (SNC) is a major factor influencing seed yield and is an important trait with complex gene interaction effects. We first performed genetic analysis, gene cloning, and molecular mechanism study for an EMS-induced sesame mutant cs1 with fewer SNC and shorter capsule length (CL). The mutant traits were due to the pleiotropism of a regressive gene (Sics1). Capsule hormone determination showed that five out of 12 hormones, including auxin indole-3-acetic acid (IAA), had significantly different levels between wild type (WT) and mutant type (MT). KEGG pathway analysis showed that plant hormone signal transduction, especially the auxin signal transduction pathway, was the most abundant differentially expressed signaling pathway. After the cross-population association and regional genome screening, we found that three homozygous loci were retained in cs1. Further analysis of these three loci resulted in the identification of SiCRC as the candidate gene for cs1. SiCRC consists of seven exons and six introns encoding 163 amino acids. The SiCRC in cs1 showed a point mutation at intron 5 and exon 6 junction, resulting in the splice site being frame-shifted eight nucleotides further downstream, causing incorrect splicing. Taken together, we assumed the SNP mutation in SiCRC disrupted the function of the transcription factor, which might act downstream of the CRC-auxin signal transduction pathway, resulting in a shorter CL and less SNC mutation of cs1 in sesame. Our results highlight the molecular framework underlying the transcription factor CRC-mediated role of auxin transduction in SNC and CL development.

Auxin signal transduction

2015 ◽  
Vol 58 ◽  
pp. 1-12 ◽  
Author(s):  
Gretchen Hagen
Keyword(s):  
Signal Transduction ◽  
Transcriptional Activation ◽  
Molecular Mechanisms ◽  
Molecular Genetic ◽  
Auxin Receptor ◽  
Future Goals ◽  
Repressor Proteins ◽  
Auxin Binding ◽  
Transcriptional Complex ◽  
Auxin Signal Transduction

The plant hormone auxin (indole-3-acetic acid, IAA) controls growth and developmental responses throughout the life of a plant. A combination of molecular, genetic and biochemical approaches has identified several key components involved in auxin signal transduction. Rapid auxin responses in the nucleus include transcriptional activation of auxin-regulated genes and degradation of transcriptional repressor proteins. The nuclear auxin receptor is an integral component of the protein degradation machinery. Although auxin signalling in the nucleus appears to be short and simple, recent studies indicate that there is a high degree of diversity and complexity, largely due to the existence of multigene families for each of the major molecular components. Current studies are attempting to identify interacting partners among these families, and to define the molecular mechanisms involved in the interactions. Future goals are to determine the levels of regulation of the key components of the transcriptional complex, to identify higher-order complexes and to integrate this pathway with other auxin signal transduction pathways, such as the pathway that is activated by auxin binding to a different receptor at the outer surface of the plasma membrane. In this case, auxin binding triggers a signal cascade that affects a number of rapid cytoplasmic responses. Details of this pathway are currently under investigation.

scholarly journals Auxin signal transduction into a quantitative change in natural auxin polar transport in pine cambium

2014 ◽  
Vol 68 (3) ◽  
pp. 201-209
Author(s):  
Tomasz J. Wodzicki ◽  
Alina B. Wodzicki ◽  
Jacek Adamczyk
Keyword(s):  
Signal Transduction ◽  
Feedback Inhibition ◽  
Molecular Transport ◽  
Signal Propagation ◽  
Basipetal Transport ◽  
Auxin Concentration ◽  
A Chain ◽  
Auxin Polar Transport ◽  
Indole 3 Acetic Acid ◽  
Auxin Signal Transduction

Results of experiments performed with 6-mm high stem sections of <em>Pinus sylvestris</em> L. confirmed the hypothesis that the fusiform cells of the cambial region respond to the arrival of indole-3-acetic-acid (IAA) at the signalling concentration in the apoplastic space around their apical ends by increasing the basipetal efflux of endogenous natural auxin. Thus, the auxin signal propagation along the stem cambial region could be a chain of reactions between the axially neighbouring cells, each capable of responding and contributing to the change of auxin concentration in the apoplast which requires only transduction of the foreign auxin signal by each of the cells to increase the basipetal efflux of their own endogenous auxin. The rate of auxin signal propagation in this system is not limited by the rate of auxin molecular transport, and if it functions in conjunction with feedback inhibition, it may produce oscillations of the auxin basipetal efflux generating supracellular auxin waves. Inhibitors of the proteinaceous auxin efflux carrier associated with the plasmalemma (NPA and TIBA), although reducing total basipetal transport of the natural auxin, did not prevent the stimulated additional efflux of this phytohormone. The studied auxin-signal transduction processes seem to be intracellular but not mediated by the Ca-calmodulin complex. The natural auxin basipetal efflux increased significantly within 45 min following the period when it had been strongly reduced by successive collections to agar receivers replaced several times at the basal ends of 6-mm high stem sections in which the intact fusiform cells of the cambial region in about 90% are arranged in only one axial row. Such exhaustion of the cellular reserve of auxin did not prevent the additional auxin basipetal efflux stimulated by the IAA apical treatment. The results may suggest an effect of the auxin signal upon the supply of newly-synthesised auxin directly to the system responsible for its basipetal efflux.

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