Effects of nitrogen on growth and photosynthetic characteristics of Cinnamomum bodinieri seedlings under drought stress
To investigate the response to drought stress and the effect of exogenous nitrogen addition on drought resistance,1-year-old Cinnamomum bodinieri seedlings were used as experimental materials,and the Hoagland nutrient solution was used as the nitrogen source.Two nitrogen levels,nitrogen deficiency(N0)and nitrogen application(N1)were set,and drought treatment was applied.The growth indexes,chlorophyll content and photosynthetic gas exchange parameters were measured at 0 d(normal water,W0),3 d(mild drought,W1),5 d(moderate drought,W2)and 8 d(severe drought,W3)after stopping watering,respectively.The results showed that drought stress could inhibit the growth and biomass accumulation of Cinnamomum bodinieri seedlings,reduce leaf chlorophyll content,induce stomatal closure,reduce intercellular carbon dioxide concentration,and inhibit the net photosynthetic rate of leaves.Exogenous nitrogen addition could promote the growth of Cinnamomum bodinieri seedlings,mainly reflected in the growth of the above-ground part,and could increase the chlorophyll content of the seedlings,and significantly increase the net photosynthetic rate of the seedlings under drought stress.
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