Effects of shade and light recovery on soybean photosynthetic characteristics and sugar metabolism
[Objective]Leaf characteristics,photosynthetic index and key enzyme activities of carbon metabolism were studied to investigate the relationship between photosynthetic characteristics and carbon metabolism in different light environments and growth stages.[Method]Two varieties,shade tolerance Nanxiadou38(ND38)and shade sensitive Huaxia5(HX5)were used in field experiment under green shading net to investigate the specific leaf weight,leaf area per plant,photosynthetic pigment concentration,photosynthetic performance,biomass distribution,sugar levels and key enzymatic activities related to carbon metabolism.[Result]With the shade treatment during shading peri-od,the specific leaf weight,leaf area per plant,photosynthetic pigment concentration and photosynthetic rate all decreased significantly with shading area treatment,and the decline of HX5 was more obvious than that of ND38.Biomass allocation increased in stem but decreased in leaf,and the leaf proportion of ND38 was significantly higher than that of HX5.Both soluble sugar and sucrose levels in leaves decreased significantly,but sucrose content under heavy shading was significantly lower than that under light shading,and the decline of HX5 was more obvious than that of ND38.Starch content increased significantly and the range of HX5 was higher than that of ND38.Starch content of HX5 all was higher than that of ND38.Sucrose synthetase(SS),sucrose phosphate synthetase(SPS)and sucrose invertase(Inv)decreased sig-nificantly.SS and Inv in heavy shading were significantly lower than of light shading,and there was no significant difference between varie-ties under the same shading treatment.During light recovery period,the difference of leaf traits among treatments decreased and the prefer-ence of leaf mass allocation ratio declined.Starch content with shading treatment was significantly higher than that of normal light.The re-covery ability of ND38 was better than that of HX5.SPS and Inv of ND38 also were significantly higher than those of HX5,but SS of ND38 was higher than that of HX5 in heavy shading treatment.The recovery ability of ND38 was better than that of HX5.[Conclusion]Specific leaf weight,photosynthetic pigment concentration,photosynthetic rate and key enzyme activities of carbon metabolism decrease significantly dur-ing shading period.However,starch content and stem biomass allocation increase.During light recovery period,photosynthetic performance and enzyme activity recovered rapidly and leaf biomass allocation increase.HX5 is sensitive to shading treatment,and its photosynthetic per-formance and enzyme activity decrease significantly.ND38 can keep quite photosynthetic performance and equitable mass allocation during shading period.The recovery ability of photosynthetic performance and key enzymatic activities of ND38 is better than that of HX5.
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