Elevated sensitivity to gibberellin by vernalization in the vegetative rosette plants of Eustoma grandiflorum and Arabidopsis thaliana

Plant Science : an International Journal of Experimental Plant Biology
M OkaM Mino

Abstract

Changes in the sensitivity to gibberellin (GA) after vernalization were studied in the vegetative rosette of Eustoma grandiflorum and late flowering Arabidopsis thaliana mutant, fca-1. The sensitivity to GA after vernalization was monitored using the bolting rate of plants that were grown on a medium containing GA(3) or ancymidol. The bolting rates were higher in vernalized plants than non-vernalized plants when the same GA(3) concentration was used. There was a positive relationship between the duration of vernalization and the bolting rate in E. grandiflorum. In contrast, a negative relationship between the duration of treatment and bolting rate was found in the non-vernalized plants. In fca-1, the flowering time of vernalized plants was significantly reduced compared with the non-vernalized plants under various concentrations of GA(3) treatment. To elucidate whether this elevated sensitivity relates to the efficiency of GA signal transduction, we measured the transcript amounts of Expansin (Exp), which is up-regulated by GA, and GA20-oxidase (GA20ox) and GA3 beta-hydroxylase (GA3betahy), which are down-regulated by GA. The transcript amounts were estimated using the Taq-Man PCR system based on combinations of primers and pro...Continue Reading

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Citations

Apr 9, 2002·Journal of Biosciences·Peter V Minorsky
Sep 13, 2014·Molecular Genetics and Genomics : MGG·Wei ZhangBeijiu Cheng
Jan 19, 2018·Physiologia Plantarum·Feiyi HuangTongkun Liu
Jun 13, 2002·Plant Physiology·Peter V Minorsky

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