2011•Journal of Nuclear Agricultural SciencesRequires access
PROMOTING EFFECTS OF CALCIUM ON PHOTOSYNTHESIS OF TOBACCO SEEDINGS UNDER CHILLING AND HIGH LIGHT ACCLIMATION
Guangyu Sun
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Abstract
The effects of calcium chloride on photosynthesis characteristic and chlorophyll fluorescence characteristic of flue-curing tobacco seedlings under chilling and high light acclimation were studied,and the seedlings of flue-curing tobacco variety Longjiang 911 was grown as material.The results showed that the net photosynthetic rates(Pn),stomatal conductance(Gs),maximal photochemical efficiency of PSⅡ(Fv /Fm) and actual photochemical efficiency of PSⅡ(ФPSⅡ) significantly decreased under the chilling and high light acclimation compared with non-acclimation seedlings,suggesting that the stress resistance was strengthened while photosynthetic capacity reduced.Pn,Fv /Fm and ФPSⅡof flue-curing tobacco seedlings increased to various degrees at the later stage of acclimation,which implied that the flue-curing tobacco seedlings leaves protected against damage of photosynthetic apparatus by suffering photo-inhibition under temperature and light intensity conducted in the experiment.The carbon dioxide compensation point(CCP) significantly decreased,while Pn,Gs,Fv /Fm,ФPSⅡ,apparent quantum yield(AQY),photosynthetic rate saturated light(Pmax),light compensation points(LCP),light saturation point(LSP),carbolyation efficiency(CE) and photosynthetic rate at saturated carbon dioxide(Jmax) of flue-curing tobacco seedlings leaves were significantly higher than that of acclimation seedlings after spraying calcium chloride.It is concluded that calcium chloride could alleviate damage of the photosynthetic apparatus of tobacco seedlings leaves under chilling and high light acclimation.