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Effects of Low Temperature Stress on the Activity of Invertase and Soluble Sugar Content in Leaves of Cassava Seedlings

Yao Yuan1,2,Min Yi1,2,Hu Xinwen2,Li Kaimian3,Guo Jianchun1 1 Institute of Biotechnology and Bioscience,CATAS,Haikou 571101,Hainan,China;2 College of Agriculture,Hainan University,Danzhou 571737,Hainan,China;3 Institute of Tropical Crops Genetic Resources,CATAS,Haikou 571737,Hainan,China  
The activity of invertase and soluble sugar content in leaves of low-temperature stressed cassava seedlings of the three cassava varieties,SC124,SC8 and ARG7 were studied.The results showed that the soluble acid invertase (SAI) was higher for the cold-tolerant cassava variety ARG7,and an increased activity was observed in all the three cassava varieties when the seedlings were under low-temperature stress.The increase of SAI was more stable and longer as the treatment lasted for ARG7,while that of neutral invertase (NI) was shorter and could only be identified after short treatment time in all three cassava varieties.Thus,SAI showed positive correlation to cold stress in cassava varieties.An increased content of sucrose,reducing sugar and soluble sugar was obtained in the three cassava varieties after low temperature treatment,but the reducing sugar,sucrose content and soluble sugar was significant higher for ARG7 than that of in SC124 and SC8.
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