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| Effects of Drought Stress on Starch Accumulation and Yield Composition of Main Potato Varieties in Yunnan |
| WU Xi1，2，LIU Jing1，2，MU Canying1，2，HE Qiulan1，2，WANG Simei1，2，WANG Zhengwei1，2，HAI Meirong1，2* |
| （1College of Agronomy and Biotechnology，Yunnan Agricultural University，Kunming 650201，Yunnan，China；2National and Local Joint Engineering Research Center for Germplasm Innovation and Utilization of Chinese Medicinal Materials in Southwest China，Kunming 650201，Yunnan，China） |
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Abstract Taking the main potato varieties in Yunnan‘Hezuo 88’‘Qingshu No.9’and‘Lishu No.6’as test materials，and watering nutrient solution as the contrast，this experiment used watering PEG solution with concentrations of 2.5%，5.0%，7.5% and 10.0%，to make the soil water content as 55%，45%，35% and 25%，respectively，simulating mild，moderate and severe drought conditions；and studied the changing rule of starch accumulation amount in potato tubers under different degrees of drought conditions，activities of key enzymes in starch synthesis，and factors in yield component．The results showed that the total starch content in potato tubers，amylose and amylopectin contents by and large presented a reducing tendency under drought stress．Under varying degrees drought stress，key enzyme activities of potato tuber starch synthesis had different variation trend and were mainly affected by varieties and drought conditions．Correlation analysis showed that under drought stress，AGPase（glucose pyrophosphorylase）and GBSS（bound starch synthase）played a major role in synthesis of starch component in‘Hezuo 88’．While，AGPase，GBSS and SBE played an important role in synthesis of starch component in‘Qingshu No.9’．And AGPase，GBSS，SBE and SSS all took part in the synthesis of‘Lishu No.6’starch component composition．Yield components analysis showed that impacts brought about by different degrees drought stress on yield components had defference between potato varieties．Of which，severe drought stress had the greatest effect on potato yield composition．
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Received: 01 March 2022
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