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- W2363723596 abstract "A study was conducted,using chlorophyll fluorescence technique and a local alfalfa variety Yuedongzhixing as experimental material,to investigate the diurnal changes of PSⅡ and maximum quantum efficiency of photosystem II photochemistry(Fv/Fm)in alfalfa leaves.The data acquired in this study showed that the diurnal changes of Fv/Fm and actual photochemical efficiency of PSⅡ(ΦPSⅡ)were related to light intensity,the functional photosystem Ⅱ reaction centers were decreased to cause significant photoinhibition.With the increasing of photosynthetic actual irradiation(PAR)to simulate PAR diurnal change,and ΦPSⅡ decreased,nonphotochemical quenching(NPQ)increased,and the fraction of excited energy allocated to PSⅡ increased to enhance PSⅡ burden carrying excited energy.These results indicated that photoinhibition in alfalfa leaves were caused primarily by increasing of excited energy allocated to PSⅡ to enhance reversible inactivation of PSⅡcenters except NPQ increasing.With the decreasing of PAR,Fv/Fm and ΦPSⅡ increased,NPQ and unbalance index of excited energy allocated to PSⅡ and PSⅠ(β/α-1)declined respectively.This indicated that the recovery of PSⅡ photochemical efficiency was caused primarily by renewing PSⅡ activation owing to unloading the energy burden of PSⅡ." @default.
- W2363723596 created "2016-06-24" @default.
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- W2363723596 date "2009-01-01" @default.
- W2363723596 modified "2023-09-27" @default.
- W2363723596 title "The Diurnal Changes of PSIIand Absorbed Light Allocation in Leaves of Alfalfa(Medicago sativa L.)" @default.
- W2363723596 hasPublicationYear "2009" @default.
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