Title: Regulating Effects of Exogenous Calcium Salts on the Photosynthesis between Two Genotypes Flue-Cured Tobacco
Abstract: The regulating effects of the exogenous calcium salts on the photosynthetic characteristics of fl uecured tobacco have been investigated with two genotypes in this paper. With ‘ZY100' and ‘YU10' as experimental materials, this soil-culture pot experiment was carried out during the development process of two cultivars in order to study the effects of three types of calcium salts on the photosynthetic physiological indexes, chlorophyll fl uorescence parameters, water use eff iciency and the accumulation of dry matter. Compared to ‘YU10', the light saturation point(LSP) of ‘ZY100' was higher, but the light compensation point(LCP) was lower. The adaptability and photosynthetic potential of ‘ZY100' under different light environment was higher. The exogenous calcium salts enhanced light saturation points(LSP) of two varieties and result in the growth of two genotypes flue-cured tobacco. The apparent quantum yield(AQY) of two varieties reached the maximum at Ca(NO3)2 treatment and its absorption efficiency under low light intensity was highest. The values of net photosynthetic rate(Pn) and the maximum net photosynthetic rate(Amax) between the treatments of calcium salts were higher than those in the control. With the application of calcium salts, the photochemical quenching coefficient(qP), maximum photochemical efficiency(Fv/Fm), actual photochemical efficiency(ФPSII) and electron transmit rate(ETR) increased, however, the original fluorescence(Fo) and non-photochemical quenching coefficient(NPQ) decreased. The water use efficiency(WUE) of flue-cured tobacco reached the highest in two genotypes at Ca(Ac)2 treatment before 75 d after transplant. Generally, the photosynthetic capability and eff iciency of two cultivars could be effectively improved by appropriate application of calcium salts so that the dry matter accumulation of tobacco could be promoted.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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