Combined effect of CO2 enrichment and foliar application of salicylic acid on the production and antioxidant activities of anthocyanin, flavonoids and isoflavonoids from ginger

BMC Complementary and Alternative Medicine

Mohd Hafiz Ibrahim¹  Ehsan Karimi¹  Hawa ZE Jaafar¹  Ali Ghasemzadeh¹ 

[1] Department of Crop Science, Faculty of Agriculture, University Putra Malaysia, 43400 University Putra Malaysia (UPM), Serdang, Selangor, Malaysia

关键词: Ginger;    DPPH activity;    Flavonoids;    Chalcone synthase;    Salicylic acid;    CO₂ enrichment;   

Others  :  1231485
DOI  :  10.1186/1472-6882-12-229

 received in 2012-07-19, accepted in 2012-10-17,  发布年份 2012

【 摘 要 】

Background

The increase in atmospheric CO₂ concentration caused by climate change and agricultural practices is likely to affect biota by producing changes in plant growth, allocation and chemical composition. This study was conducted to evaluate the combined effect of the application of salicylic acid (SA, at two levels: 0 and 10^-3 M) and CO₂ enrichment (at two levels: 400 and 800 μmol·mol⁻¹) on the production and antioxidant activities of anthocyanin, flavonoids and isoflavonoids from two Malaysian ginger varieties, namely Halia Bentong and Halia Bara.

Methods

High-performance liquid chromatography (HPLC) with photodiode array detection and mass spectrometry was employed to identify and quantify the flavonoids and anthocyanins in the ginger extracts. The antioxidant activity of the leaf extracts was determined by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) and thiobarbituric acid (TBA) assays. The substrate specificity of chalcone synthase, the key enzyme for flavonoid biosynthesis, was investigated using the chalcone synthase (CHS) assay.

Results

CO₂ levels of 800 μmol·mol⁻¹ significantly increased anthocyanin, rutin, naringenin, myricetin, apigenin, fisetin and morin contents in ginger leaves. Meanwhile, the combined effect of SA and CO₂ enrichment enhanced anthocyanin and flavonoid production compared with single treatment effects. High anthocyanin content was observed in H Bara leaves treated with elevated CO₂ and SA. The highest chalcone synthase (CHS) activity was observed in plants treated with SA and CO₂ enrichment. Plants not treated with SA and kept under ambient CO₂ conditions showed the lowest CHS activity. The highest free radical scavenging activity corresponded to H Bara treated with SA under high CO₂ conditions, while the lowest activity corresponded to H Bentong without SA treatment and under atmospheric CO₂ levels. As the level of CO₂ increased, the DPPH activity increased. Higher TBA activity was also recorded in the extracts of H Bara treated with SA and grown under high CO₂ conditions.

Conclusions

The biological activities of both ginger varieties were enhanced when the plants were treated with SA and grown under elevated CO₂ concentration. The increase in the production of anthocyanin and flavonoids in plants treated with SA could be attributed to the increase in CHS activity under high CO₂ levels.

【 授权许可】

   
2012 Ghasemzadeh et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

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