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《Acta Prataculturae Sinica》 2006-06
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Effect of chilling stress on carbon and nitrogen metabolism of leguminous Cassia rotundifolia seedlings

WENG Bo-Qi,JIANG Fu-Ying,FANG Jin-Mei,YING Zhao-Yang,HUANG Yi-Bin(Agricultural Ecology Institute,FAAS;Fujian Engineering and Technology Research Center for Hilly Prataculturae,Fuzhou 350013,China)  
The changes of free amino acids,soluble protein and sugar contents in leaves of C.rotundifolia seedlings and the relation between them and cold resistance under chilling stress were discussed by modeling different chilling stress grades as 15,10 and 5℃ in comparison with 25℃ in this paper.The chilling stress lasted 24 h,48 h,72 h,96 h,and 120 h under 5℃,respectively.Compared with the CK(25℃),the soluble sugar contents in the leaves under 15,10 and 5℃ stress increased by 83.21%,224.02% and 257.94% respectively while the gross free amino acids increased by 26.51%,128.11% and 324.43%,hydrolyzed amino acids decreased by 10.75%,39.57% and 43.60%,and soluble protein content increased by 3.37%,4.92% and 8.11%.After 24,48,72,96 and 120 hours'treatment with 5℃ chilling stress,the soluble sugar content increased by 239.07%,243.64%,248.05%,252.70% and 257.94% more than the CK(25℃),and the soluble protein content increased by 2.73%,3.37%,6.07%,6.99% and 8.11%,respectively.The cold resistance mechanism increased the soluble sugars,the free amino acids and the soluble protein contents under chilling stress.The enhanced contents of soluble sugars and free amino acids might increase the cell sap concentration,which protected the protoplasm.The soluble proteins had strong water-absorbing capacities which strengthened the cold resistances of the seedlings and their increases could enhance the water-retaining capacities of the cells thereby reducing the chances of seedling deaths due to the icing of protoplasm.
【Fund】: 福建省科技厅重点项目(2005N029)资助
【CateGory Index】: S541.9
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