Cytokinin effects on tetrapyrrole biosynthesis and photosynthetic activity in barley seedlings

Planta
Elena YaronskayaB Grimm

Abstract

Cytokinin promotes morphological and physiological processes including the tetrapyrrole biosynthetic pathway during plant development. Only a few steps of chlorophyll (Chl) biosynthesis, exerting the phytohormonal influence, have been individually examined. We performed a comprehensive survey of cytokinin action on the regulation of tetrapyrrole biosynthesis with etiolated and greening barley seedlings. Protein contents, enzyme activities and tetrapyrrole metabolites were analyzed for highly regulated metabolic steps including those of 5-aminolevulinic acid (ALA) biosynthesis and enzymes at the branch point for protoporphyrin IX distribution to Chl and heme. Although levels of the two enzymes of ALA synthesis, glutamyl-tRNA reductase and glutamate 1-semialdehyde aminotransferase, were elevated in dark grown kinetin-treated barley seedlings, the ALA synthesis rate was only significantly enhanced when plant were exposed to light. While cytokinin do not stimulatorily affect Fe-chelatase activity and heme content, it promotes activities of the first enzymes in the Mg branch, Mg protoporphyrin IX chelatase and Mg protoporphyrin IX methyltransferase, in etiolated seedlings up to the first 5 h of light exposure in comparison to contro...Continue Reading

References

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Citations

Jun 3, 2008·Journal of Experimental Botany·Tomás WernerThomas Schmülling
Aug 22, 2008·Plant Physiology·Yan O ZuboThomas Börner
Feb 2, 2013·PloS One·Xiuling ShiAaron M Rashotte
May 31, 2013·World Journal of Microbiology & Biotechnology·Robert RojasRita de Cassia Café Ferreira
Jan 31, 2016·Journal of Experimental Botany·Sai Krishna TallaRajeshwari Ramanan
Apr 16, 2015·Journal of Experimental Botany·Anne Cortleven, Thomas Schmülling
May 12, 2017·Journal of Agricultural and Food Chemistry·Lijuan ZhaoArturo A Keller
Feb 13, 2019·The Plant Journal : for Cell and Molecular Biology·Jan SkalákBřetislav Brzobohatý
Jun 13, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Carlos AgiusWilfried Rozhon
Oct 20, 2020·Journal of Food Science and Technology·Kimroeun VannJirawan Apiraksakorn
Apr 27, 2021·The Plant Journal : for Cell and Molecular Biology·Zhiwei HouBernhard Grimm

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