Effect of Drought Stress on the Physiological and Biochemical Indexes of Potato at Different Growth Stages

Purpose In order to find out the effects of drought strss on physiological and biochemical indexes of potato during different growth stages.

Methods Four staple potato cultivars (Hezuo88, Lishu6, Xuanshu2 and Hui-2) planted in Yunnan Province were used as the experimental materials, the physiological and biochemical indexes of four potato varieties at seedling stage, squaring stage, full-bloom stage were measured and analyzed, fuzzy membership function analysis was carried out on the variation of physiological and biochemical indexes.

Result Under drought stress at different growth stages, the total chlorophyll contents of four potato varieties were different significantly lower than that of control (CK), and the proline content, soluble protein content, SOD activity, POD activity, CAT activity and MDA content were different significantly higher than those of CK. Based on the change ranges and fuzzy membership function value of all physiological and biochemical indexes, squaring stage drought stress had a great impact on Hezuo88, seedling stage drought stress had the largest impact on the other varieties, while drought stress showed the minimal impact at full-bloom stage.

Conclusion The effects of drought stress on physiological and biochemical indexes of potato were different, depending on the varieties and drought period.