Title: Effects of Low Light on Growth and Photosynthetic Fluorescence Characteristics in Soybean Seedling
Abstract: Soybean seedlings are usually affected by shading in maize-soybean relay strip intercropping conditions. This work aimed to investigate the response of soybean seedling growth and photosynthetic fluorescence characteristics to low light environment. The light intensity of 12 000,7 200 and 3 600 lx were chose for simulating different light environment. Soybean( G.max L. Merr.) cultivar Gongxuan 1( shade tolerance) and Guixia 3( shade sensitive) were used as experimental materials. The results showed that the height increased and the values of stem diameter,root diameter,root length,biomass,and root-shoot ratio decreased with declined of light intensity. For photosynthetic pigments,the 3 600 lx light intensity were significantly higher than that of CK. With light intensity declined,net photosynthetic rate( Pn) and transpiration rate( Tr) appeared the trend of low-high-low,whereas stomatal conductance( Gs) and intercellular CO2concentration( Ci) gradually decreased. Fluorescence parameters F,Fm',Fo and Fm of Guixia 3 increased with the declining of light intensity,however,those of Gongxuan 1 were maximized in light intensity of 7 200 lx. In addition,the non-photochemical quenching( NPQ) increased and the Fv / Fo displayed a trend of high-low-high of two soybean varieties with the decrease of light intensity.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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