Study summary · research use only
Short Exogenous Peptides Regulate Expression of CLE, KNOX1, and GRF Family Genes in Nicotiana tabacum
Plain-language summary
Paraphrased from the published abstract below — not a verdict on whether anything works.
In this study using tobacco (Nicotiana tabacum) callus cultures and plant regenerants, researchers examined effects of the short peptides epitalon (Ala-Glu-Asp-Gly), bronchogen (Ala-Glu-Asp-Leu), and vilon (Lys-Glu) at concentrations of 10-7 to 10-9 M. Epitalon and bronchogen were reported to increase callus growth and stimulate leaf formation and growth in plant regenerants. The peptides were reported to modulate expression of CLE family genes, KNOX1 transcription factor genes, and GRF genes coding for DNA-binding proteins such as topoisomerases and nucleases. The authors describe these peptides as a possible new generation of plant growth regulators with potential use in experimental botany, plant molecular biology, biotechnology, and agronomy.
Abstract
Exogenous short biologically active peptides epitalon (Ala-Glu-Asp-Gly), bronchogen (Ala-Glu-Asp-Leu), and vilon (Lys-Glu) at concentrations 10-7-10-9 M significantly influence growth, development, and differentiation of tobacco (Nicotiana tabacum) callus cultures. Epitalon and bronchogen, in particular, both increase growth of calluses and stimulate formation and growth of leaves in plant regenerants. Because the regulatory activity of the short peptides appears at low peptide concentrations, their action to some extent is like that of the activity of phytohormones, and it seems to have signaling character and epigenetic nature. The investigated peptides modulate in tobacco cells the expression of genes including genes responsible for tissue formation and cell differentiation. These peptides differently modulate expression of CLE family genes coding for known endogenous regulatory peptides, the KNOX1 genes (transcription factor genes) and GRF (growth regulatory factor) genes coding for respective DNA-binding proteins such as topoisomerases, nucleases, and others. Thus, at the level of transcription, plants have a system of short peptide regulation of formation of long-known peptide regulators of growth and development. The peptides studied here may be related to a new generation of plant growth regulators. They can be used in the experimental botany, plant molecular biology, biotechnology, and practical agronomy.
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