Differential Induction by Methyl Jasmonate of Genes Encoding Ornithine Decarboxylase and Other Enzymes Involved in Nicotine Biosynthesis in Tobacco Cell Cultures
Overview
Authors
Affiliations
A cDNA of tobacco BY-2 cells corresponding to an mRNA species which was rapidly induced by methyl jasmonate (MeJA) in the presence of cycloheximide (CHX) was found to encode ornithine decarboxylase (ODC). Another cDNA from a MeJA-inducible mRNA encoded S-adenosylmethionine synthase (SAMS). Although these enzymes could be involved in the biosynthesis of polyamines, the level of putrescine, a reaction product of ODC, increased slowly and while the levels of spermidine and spermine did not change following treatment of cells with MeJA. However, N-methylputrescine, which is a precursor of pyrrolidine ring of nicotine, started to increase shortly after MeJA-treatment of cells and the production of nicotine occured thereafter. The levels of mRNA for arginine decarboxylase (ADC), an alternative enzyme for putrescine synthesis, and that for S-adenosylmethionine decarboxylase (SAMDC), required for polyamine synthesis, were not affected by MeJA. In addition to mRNAs for ODC and SAMS, mRNA for putrescine N-methyltransferase (PMT) was also induced by MeJA. Unlike the MeJA-induction of ODC mRNA, MeJA-induction of SAMS and PMT mRNAs were blocked by CHX. The level of ODC mRNA declined after 1 to 4 h following MeJA treatment, while the levels of mRNAs for SAMS and PMT continued to increase. Auxin significantly reduced the MeJA-inducible accumulation of mRNAs for ODC, SAMS and PMT. These results indicate that MeJA sequentially induces expression of a series of genes involved in nicotine biosynthesis by multiple regulatory mechanisms.
Kurotani K, Hirakawa H, Shirasawa K, Tagiri K, Mori M, Ramadan A Plant J. 2024; 121(1):e17178.
PMID: 39625948 PMC: 11712010. DOI: 10.1111/tpj.17178.
Kaminski K, Bovet L, Hilfiker A, Laparra H, Schwaar J, Sierro N BMC Genomics. 2023; 24(1):516.
PMID: 37667170 PMC: 10476381. DOI: 10.1186/s12864-023-09588-8.
Shoji T, Hashimoto T, Saito K J Exp Bot. 2023; 75(6):1741-1753.
PMID: 37647764 PMC: 10938045. DOI: 10.1093/jxb/erad341.
Laszlo C, Kaminski K, Guan H, Fatarova M, Wei J, Bergounioux A Molecules. 2022; 27(22).
PMID: 36432206 PMC: 9694777. DOI: 10.3390/molecules27228105.
Mo Z, Duan L, Pu Y, Tian Z, Ke Y, Luo W Front Plant Sci. 2022; 13:860455.
PMID: 35574122 PMC: 9096834. DOI: 10.3389/fpls.2022.860455.