Quantification of the effect of environmental variables on the rate of starch accumulation during the potato growth cycle

In this study, we selected potato varieties with varying starch contents, set up different degrees of water stress treatments, and varied temperatures to investigate the effects of water stress and high temperatures on the activities of key enzymes of potato starch synthesis and the rate of starch accumulation. We observed the mechanism of potato water stress on starch synthesis and accumulation. Next, we measured the amount of starch in potato tubers across various potato types exposed to varying levels of drought stress. The findings showed that soil moisture stress greatly decreased the activities of the AGPase, GBSS, SSS, and SBE enzymes (P<0.05). Under a severe drought-stress environment, the starch content was significantly reduced to a minimum value of 74 mg/g compared to normal moisture conditions.AGPase and GBSS enzyme activities were reduced by 7.14% and 19.05%, 40.69% and 10.34%, respectively, and the rate of starch accumulation was also significantly reduced after high-temperature treatment T1 compared to T2 and T3. The average accumulation rates in different environments: high temperature > drought stress > water stress.