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Used in this assay the four cooked different sugarcane varieties Guitang 11 Guitang 17 new Taiwan Sugar No. 10 , No. 20 New Taiwan Sugar as the test material , in sugarcane growth preliminary to 100mg / L ethephon foliar spray research ethephon on photosynthetic characteristics in sugarcane leaves C 4 pathway two key light synthase activity , chlorophyll content , N, P, K content was measured , and analyzed the relationship between these factors and the growth of sugar cane . Also the field indicators investigation . The results show that : 1 ethephon treatment can improve the net photosynthetic rate and transpiration rate of the sugar cane , but the effect of different varieties , especially Guitang 11 new Taiwan Sugar No. 10, the effect of the most significant . 2 net photosynthetic rate of sugarcane light intensity of response curves showed that ethephon treatments can improve the net photosynthetic rate light intensity response slope of the curve , after Ethrel is more conducive to sugarcane strains use of light intensity , thereby increasing the sugar cane net photosynthetic rate . 3 , the diurnal variation of net photosynthetic rate of sugarcane curve for a single peak curve , maximum net photosynthetic rate around about 11:00 am , Ethrel peak shape of the curve of the net photosynthetic rate unchanged , but the handling of the peak level of increase . Ethrel can improve PEP completed dismutase and NADP- malic enzyme activity , which is conducive to the conduct of photosynthesis . 5 , ethephon treatment increased the chlorophyll content . Ethrel can improve the sugar cane +3 leaves the content of N, P , but has little effect on K .
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