Effects of different light qualities on the growth and secondary metabolites of Mentha spicata L.
In this study,the seedlings of Mentha spicata L.were treated with red light(R),blue light(B)and red-blue mixed light(RB),and natural light(W)was used as control.Moreover,the effects of light quality on the growth,physiological indices and secondary metabolite synthesis of menthol were studied.The results showed that different light qualities could affect the rooting rate,axillary bud germination rate,stem diameter,number of leaves,fresh weight of aboveground parts and leaf moisture content.Red Light and red-blue mixed light significantly increased the soluble sugar content in leaves.The content of soluble protein in leaves increased with the increase of the ratio of blue light,the chloro-phyll content in red-blue mixed light treatment was significantly higher than that in the control,and the chlorophyll content in red light treatment and blue light treatment was also increased.Red light mainly affected the content of chlorophyll a,while blue light affected the con-tent of chlorophyll b.Compared with the control,the con-tent of carvone,a secondary metabolite of menthol,was decreased under red light treatment and blue light treat-ment.Red-blue mixed light promoted the accumulation of carvone,decreased the content of D-limonene and increased the proportion of some terpene compounds.Different light qualities can affect the growth and physiological indexes of Mentha spicata L.,and the red-blue mixed light can change the content of secondary metabolites,which provides a basis for impro-ving the medicinal value and industrial breeding of menthol.
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