It was reported that curcumin is synthesized in leaves and then transported to rhizome. I am interested to know at any time of days after sowing, which leaf (according to phyllotaxy) produces maximum curcumin. Is curcumin production related to leaf age or growth or size?
Dear GiridharKalidasu, See Asghari, G., Mostajeren, A., and M. Shebl. 2009. Curcumoid and esstential oil of tumeric at different stages of growth in Iran. Res. Pharm. Sci. 4(1);55-61. The maximum curcumin is a function of growth and size and reaches an optimum at 8 to 10 months. Production can be optimized by 25 to 50% reduction of light intensity. Good Luck with your research objectives.
Dear Dr. Kalidasu, I suggest you to read Wu et al. (2015) Factors Affecting the Accumulation of Curcumin in Microrhizomes of Curcuma aromatica Salisb. BioMed Research International, Volume 2015, Article ID 740794, 10 pages. (http://dx.doi.org/10.1155/2015/740794)
They studied effects of factors such as sucrose concentration, different ratios of 6-benzylaminopurine (6-BA) and α-naphthalene acetic acid (NAA), and light quality on the accumulation of curcumin and other curcuminoids in Curcuma aromatica. Microrhizomes grown on media containing 3% sucrose produced more curcumin and other curcuminoids than those grown on higher concentrations. Moreover, when compared to other ratios of 6-BA and NAA, microrhizomes induced on 3% sucrose media supplemented with 3.0 mg/L 6-BA and 0.5 mg/L NAA produced more curcumin and other curcuminoids; however, the amount was less than in microrhizomes grown on 3% sucrose alone. They observed that a 5% sucrose medium supplemented with 3.0 mg/L of 6-BA and 0.5 mg/L of NAA enhanced the levels of curcumin and curcuminoids and that exposure to red light further increased production.
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