Influence of Added Cadmium Stress on Photosynthetic Characteristics of Maize in Seedling Stage

doi:10.7668/hbnxb.2008.01.022

Abstract

Abstract: A pot experiment was conducted to study the effects of added cadmium(Cd)on photosynthetic characteris -tics of maize under simulated photosynthetic radiation(PAR). The results showed that under Cd stress, maximum photo -synthesis rate(Pnmax), transpiration rate(Tr)decreased significantly. Light saturation point(LSP)and apparent quantumyield(AQY)were also reduced. Cd stress decreased stomatal conductance(Gs).The reduction of Pnby Cd stress were dueto the stomatal limitation under lower PAR,while non -stomatal limitation under higher PAR. Gs of Jitian 6 was more af -fected by Cd stress.The initial fluorescence yield(F_o)of maize leaves with dark adaptation was increased. However themaximum fluorescence yield(F_m), the variable fluorescence(F_v), the potential activity of photosystem II(Fv/Fo), the max -imal quantum yield of photosystem II photochemistry(F_v/F_m)decreased due to Cd stress. It indicated that the efficiency ofprimary conversion of light energy of PS II and its potential activities were inhibited significantly caused by Cd stress.Comparing with Jidan 209, Jitian 6 suffered more reduction in efficiency of light energy transfer and electron transport.

Key words: Cd stress, Maize, Photosynthesis, Fluorescence

CLC Number:

S513.01

ZHANG Lei, YU Yan-ling, ZHANG Lei. Influence of Added Cadmium Stress on Photosynthetic Characteristics of Maize in Seedling Stage[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2008, 23(1): 101-104. doi: 10.7668/hbnxb.2008.01.022.

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