Effects of Drought in Different Periods on Yield Formation and Starch Gelatinization Characteristics of Starchy Sweet Potato
In order to study the effects of drought treatment in different periods on the yield formation and starch gelatinization characteristics of starchy sweet potatoes,four different periods of drought were set up under controlled water conditions for the starchy sweet potato varieties Shangshu 19 and Yanshu 29,the root development and branching period(early stage),the vine development period(middle stage),the tuber expansion period(late stage)and normal watering during the whole reproductive period(CK).The results showed that the shoot biomass of Shangshu 19 were reduced by 35.7％,18.7％and 11.4％,respectively,and the root biomass were reduced by 55.4％,36.1％and 20.8％,respectively,compared with the CK in different periods of drought treatment.The shoot biomass of Yanshu 29 were reduced by 47.4％,20.9％and 13.8％,respectively,and the root biomass were reduced by 60.2％,49.9％and 15.1％,respectively.Compared with the control,drought in different periods made sweet potato yield reduction,the yield of dried sweet potatoes decreased with 14.3％,1.8％and 3.6％for Shangshu 19,and 20.0％,6.9％and 5.7％for Yanshu 29.Drought stress in different periods could reduce the starch yield and increase the dry matter yield,and the dry matter yield of potato was the highest during the root expansion period,which were increased by 10.6％and 8.7％compared with the CK for Shangshu 19 and Yanshu 29,respectively.The starch content of root initiation stage was the lowest,which were 11.8％and 16.4％lower than that of the CK in Shangshu 19 and Yanshu 29,respectively.Drought stress affected starch gelatinization characteristics in different periods,and drought at the middle and late stages could improve starch quality,but persistent drought significantly reduced starch gelatinization parameters.
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