Effect of Photosynthetic Pigments,Diurnal Changes of Fluorescence and Ultrastructure in Fast Growing Period of Flue-cured Tobacco to Molybdenum Deficiency
Abstract:The effects on the photosynthetic pigments,the diurnal changes of chlorophyll fluorescence parameters and ultrastructure used by 0.20 mg·kg-1 as CK and 0 mg·kg-1 as molybdenum deficiency treatment were studied on flue-cured tobacco of fast growing period,which is one of the model crop materials.The results showed that:(1)The contents of chlorophyll and carotenoid in tobacco leaves under molybdenum deficiency were significantly lower than those under Mo-fertilized treatment.(2)The net photosynthetic rate(Pn) declined under molybdenum deficiency earlier than that under Mo-fertilized treatment in a day,and the Pn of tobacco in Mo-fertilized treatment was a typical bimodal daily variation.(3)Under molybdenum deficiency,the maximal photochemical efficiency(Fv/Fm)decreased significantly at 12:00 and increased slightly at 16:00.At 10:00,the electron transport rate(ETR) and the quantum yield(Y) began to decrease,but the initial fluorescence(F0)and the non-photochemical quenching efficiency(NPQ) increased sharply,then they did not recover to the level at 8:00.In contrast,under Mo-fertilized treatment,the Fv/Fm was stable,ETR and Y reached the lowest point at 14:00 and then increase slightly at 16:00.F0 and NPQ increased slower during 12:00-14:00,and recovered to the level at 8:00.(4)The grana layer of the ultrastructure of tobacco leaves under molybdenum deficiency expanded to deformation and loose.The amyloid number was less and grew worse.While the grana layer of the tobacco in Mo-fertilized treatment were arranged neatly,and the amyloid grew well.In summary,under molybdenum deficiency,the contents of the photosynthetic pigments of fast growing period tobacco decrease,ultrastructure grows worse,and the chlorophyll fluorescence parameters are sensitive to the bright-light and high-temperature,photosynthetic primary action is inhibited,so the Pn and photosynthetic carbon assimilation product decreased.
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