| In order to find out whether difference exists in canopy temperature of soybean of different genotypes,infrared radiation thermometer was used to determine the soybeans canopy temperatures of five varieties for a long time,at the same time,determination was also made of percentage of green leaf,soluble protein content,SOD activity,CAT activity and MDA content of the functional leaves of soybean caulis in the periods of duration.The results showed that there were soybean germplasm of low canopy temperature and soybean germplasm of high canopy temperature,the cold soybean Fendou 55 and Ji NF 58,the warm soybean Dongda 2 and Weidou 20,for examples.During the whole seed filling-time,the percentage of green leaf,soluble protein content,SOD activity,CAT activity of cold soybean were superior to warm soybeans and the accumulation of MDA content was obvious slower with process of period of duration.According to these it is thought that difference phenomenon exists in canopy temperature of different genotype soybeans and the relation between temperature type and quality of senescence characters of leaf function was close,which could offer academic base for high yielding and dependable cropping of soybean. |