干旱胁迫对马铃薯不同生育时期生理生化指标的影响

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

【目的】探明干旱胁迫对马铃薯不同生育时期生理生化指标的影响。【方法】以云南省主栽的4个马铃薯品种(合作88、丽薯6号、宣薯2号及会-2)为试验材料,在干旱胁迫及对照条件下分别测定分析马铃薯各品种苗期、现蕾期和盛花期的生理生化指标,并对各生理生化指标变幅进行模糊隶属函数分析。【结果】不同生育时期干旱胁迫下,4个马铃薯品种的总叶绿素含量较对照处理(CK)不同差异显著性降低,各马铃薯品种的脯氨酸含量、可溶性蛋白含量、SOD活性、POD活性、CAT活性及MDA含量的值均较CK不同差异显著性增加;结合各生理生化指标变幅及指标变幅的模糊隶属函数结果分析认为:现蕾期干旱胁迫对合作88的影响最大,苗期干旱胁迫对丽薯6号、宣薯2号及会-2的生长发育影响相对较大,盛花期干旱胁迫对4个马铃薯品种的生长发育影响相对较小。【结论】干旱胁迫对马铃薯生理生化指标的影响因品种和干旱时期不同而异。

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