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The Involvement of DNA Methylation in Plant Growth Regulators-Mediated Growth in Tomato (Solanum lycopersicum) Seedlings

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Abstract

DNA methylation is a kind of epigenetic modification regulated by DNA methyltransferases and DNA demethylases. Here, the influences of DNA methylation inhibitor 5-aza-2'-deoxycytidine (5-azadC) combined with plant hormones [abscisic acid (ABA), methyl jasmonate (MeJA), and gibberellic acid (GA3)] and small gaseous signal molecules [(nitric oxide (NO), hydrogen sulfide (H2S), and hydrogen gas (H2)] on the tomato (Solanum lycopersicum) seedlings growth were explored. Moreover, the expression levels of DNA methyltransferases and demethylases under plant hormones and small gaseous molecules were detected. We found that ABA and MeJA restrained tomato seedling growth, and GA3, NO, H2S, and H2 promoted seedling growth. Nevertheless, 5-azadC treatment retarded the effects of these plant growth regulators mentioned above. Moreover, ABA boosted SlDRM5 expression, whereas GA3 and MeJA treatments inhibited the expression. Sodium hydrosulfide and hydrogen-rich water treatments affected SlDRM5 expression. Moreover, MeJA increased the quantity of SlDML1 transcripts from 3 to 24 h, while other therapies decreased the quantity. It is interesting to note that GA3 expressively induced SlMET1 and SlDML2 expression. Hence, DNA methylation may be essential for plant growth and is controlled by phytohormones and gaseous signal channels. The findings above offer fresh perspectives on how DNA methylation inhibitor reacts to different plant growth regulators.

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Funding

This study was supported by the National Key Research and Development Program of China (Grant No. 2018YFD1000800); the National Natural Science Foundation of China (Nos. 32072559, 31860568, 31560563, 31160398, and 32102370); the Natural Science Foundation of Gansu Province, China (Nos. 20JR5RA027, 1606RJZA073, 1606RJZA077, and 1606RJYA252); and the Fuxi Young Talents Fund of Gansu Agricultural University (No. Gaufx-03Y07).

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Conceptualization, WL; Formal analysis, ZL, CL, XP, and HZ; Funding acquisition, WL and CW; Investigation, CW, ZL, YY, and DH; Methodology, CW and ZL; Project administration, ZL and CW; Resources, ZL; Supervision, WL Writing of the original draft, ZL; Writing, reviewing, & editing of the manuscript, ZL, CW, and WL.

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Correspondence to Weibiao Liao.

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The authors declare no conflicts of interest.

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Liu, Z., Liu, C., Wang, C. et al. The Involvement of DNA Methylation in Plant Growth Regulators-Mediated Growth in Tomato (Solanum lycopersicum) Seedlings. J Plant Growth Regul 43, 1287–1303 (2024). https://doi.org/10.1007/s00344-023-11183-w

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  • DOI: https://doi.org/10.1007/s00344-023-11183-w

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