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《Plant Physiology Journal》 2017-05
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Effect of drought on the contents of soluble sugars,starch and enzyme activities in cassava stem

ZHAO Chao;WANG Hai-Yan;LIU Mei-Zhen;WANG Wen-Quan;College of Environment and Plant Protection,Hainan University;The Institute of Tropical Bioscience and Biotechnology,Chinese Academy of Tropical Agricultural Sciences;  
This study examined the active changes of the soluble sugar content, starch content and enzyme activities in cortex and stele of plant stem after continuous drought for 26 days. Two cassava varieties, SC124(drought resistant) and Arg7(sensitive to water stress), were used for investigating the drought response of starch metabolism. The results showed that trehalose with a higher concentration produced in the cortex and stele of stems in both SC124 and Arg7 under the drought stress, which was an important component of osmotic regulation in cassava adaptable to water stress. Also, fructose, glucose and sucrose were important osmotic materials in cassava. Fructose and glucose contents of the cortex and stele increased, while sucrose contents increased and then decreased. The results indicated that sucrose was degradated into glucose and fructose under drought stress, which were smaller molecular weight. While the content of soluble sugar decreased greatly, and the capacity of osmotic regulation decreased under severe drought conditions. Drought-resistant variety SC124 had higher soluble sugar content in the cortex and stele than non-drought-resistant variety Arg7 under drought stress. The analysis of starch contents, and examination of the number of starch grains with scanning electron microscope showed that SC124 and Arg7 contained a lot of starch in stem, while decreased significantly in the cortex and stele under drought stress. Moreover, the activity of ADP-glucose pyrophosphorylase(AGPase), starch phosphorylase(SP), α-amylase and sucrose synthase(Su Sy) in stem were measured to indicate that the activity of starch decomposition enzyme increased under drought stress.
【Fund】: 国家木薯产业技术体系(CARS-12wwq);; 海南大学科研启动基金(kyqd1426)~~
【CateGory Index】: S533
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