Biologia plantarum 66:96-102, 2022 | DOI: 10.32615/bp.2021.065
Regulation of StTCP15 gene expression and tuber dormancy characteristics of potato by gibberellic acid, abscisic acid, and low temperature
- 1 College of Life Science and Technology, Gansu Agricultural University, Lanzhou 730070, P.R. China
- 2 Gansu Provincial Key Laboratory of Arid Land Crop Science, Gansu Agricultural University, Lanzhou 730070, P.R. China
- 3 Key Laboratory of Functional Genomic and Molecular Diagnosis of Gansu Province, Lanzhou 730070, P.R. China
- 4 Gansu Pharmaceutical Investment Group Co., Lanzhou 730030, P.R. China
Potato (Solanum tuberosum L.) cv. Eshu 10 was used to investigate the effects of exogenous gibberellic acid (GA3), abscisic acid (ABA), and low-temperature stress on changes of hormone content, expression patterns of StTCP15 gene, and tuber dormancy characteristics. Under GA3 treatment and low-temperature stress, tuber dormancy was broken in about one week sooner compared with the control group, but ABA treatment did not significantly promote the breaking of tuber dormancy. The results of hormone determination using liquid chromatography-mass spectrometry (LC-MS/MS) showed that the content of ABA in tubers treated with GA3 or low-temperature stress was lower than in the control group, and it was higher than in the control group under ABA treatment. The GA3 content of tubers was higher than in the control group under GA3 treatment and lower under low-temperature stress. During dormancy, the ABA content continued to increase and GA3 content fluctuated, ABA content rapidly decreased and GA3 content rapidly increased when the dormancy was breaking, and both ABA content and GA3 content increased during germination. The results from the assay of real-time quantitative PCR showed that the expression of the StTCP15 gene was continuously increased during the dormant period in all groups, and the expression of the StTCP15 gene was the highest at the time of dormancy release. The expression of the StTCP15 gene was increased about 15 times on the 7th d under low-temperature stress and was restored at room temperature. Thus, the StTCP15 gene can respond to GA3, ABA, and low-temperature stress and may be involved in the release of potato tuber dormancy.
Keywords: abscisic acid, gibberellin, low temperature, potato, Solanum tuberosum, StTCP15 gene, tuber dormancy.
Received: March 17, 2021; Revised: August 25, 2021; Accepted: November 3, 2021; Published online: April 7, 2022 Show citation
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