Effects of Cerium on Aroma Precursors and Growth of Tobacco
A pot experiment with Yunyan 87 was conducted to investigate the effects of cerium nitrate(0,15,30,45,60 mg·L-1)on Aroma precursors(plastid pigments content,polyphenols content),chemical composi-tion content and growth(photosynthetic and agronomic traits)of tobacco,which is helpful to explore the effect of rare earth element cerium on the aroma precursors and growth of tobacco.The results show that the"Horme-sis"effects of cerium nitrate,which will promote one index at low application and inhibit it at high application,are found on 9 substances content,including chlorophyll a,carotenoids,chlorophyll a+chlorophyll b,neochlo-rogenic acid,cryptochlorogenic acid,rutin,total phenols,reducing sugar and total sugar,and also found in ra-tio of reducing sugar to total sugar,ratio of total sugar to nicotine,ratio of total nitrogen to nicotine,ratio of po-tassium to chloride,transpiration rate,stomatal conductance and net photosynthetic rate.With the increase of cerium nitrate concentration,chlorine and root volume increase,while scopolamine and total phosphorus con-tent decrease.In this study,15 mg·L-1 of cerium nitrate promotes the accumulation of plastid pigments and poly-phenols of tobacco leaves,15-45 mg·L-1 of cerium nitrate improves chemical quality of tobacco leaves,30 mg·L-1 of cerium nitrate enhances the photosynthesis of tobacco leaves,15-30 mg·L-1 of cerium nitrate has a positive effect on the plant height,stem circumference and leaf area of above-ground tobacco plants,and 60 mg·L-1 of cerium nitrate promoted the growth of tobacco roots.Overall,cerium nitrate with the concentration of 15-30 mg·L-1 is beneficial to improving the aroma precursors of tobacco and promoting its shoot growth.
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