Effect of gibberellin on the phytohormone and related physiological response of Ulva prolifera

• 1、Key Laboratory of Marine Biotechnology of Zhejiang Province, School of Marine Sciences, Ningbo University, Ningbo 315211

Abstract：In this study, the effects of exogenous gibberellin (GA) on the endogenous phytohormone content, chlorophyll fluorescence parameters, protein, carbohydrate and antioxidant capacity in marine algae Ulva prolifera were investigated. Results showed that the phytohormone content of all experimental groups firstly increased, then decreased, lastly kept stable affected by GA. Compared to the control group, the maximum magnification of contents were different, which was about 2.0 for indole acetic acid(IAA), 15.0 for gibberellin(GA), 4.0 for zeatin(ZR), 4.0 for trans zeatin riboside(TRZ), 6.0 for isopentenyl adenine(IP), 2.5 for isopentenyl adenosine(IPA), 2.0 for jasmonic acid(JA), respectively. The Fv/Fm and rETR of 0.5 μg/mL GA group were higher than those of the other experimental groups and the control group; the protein of 0.5 μg/mL GA group was more than others,; the carbonhydrates of 1.0 μg/mL experimental group had the most content; the antioxidant capacity (SOD and POD) was superior to the control. It was concluded that exogenous GA could enhance the growth, what's more, 0.5 μg/mL GA showed the greatest effective.

Keywords： Gibberellin Ulva prolifera Phytohormone