干旱胁迫对18个马铃薯品种生理特性的影响

Effects of Drought Stress on Physiological Characteristics of 18 Potato Varieties

随着马铃薯产业的高速发展,马铃薯主粮化逐渐成为世界趋势,加快马铃薯产业的发展进程,对中国农业发展具有重要意义。为筛选适宜内蒙古自治区种植的抗旱马铃薯品种,以18个马铃薯品种为供试材料,采用大田干旱胁迫处理,测定和分析其在苗期、块茎形成期和块茎膨大期的生理指标。干旱胁迫处理后,马铃薯叶片的POD活性和SOD活性普遍呈现先升高后降低的变化趋势,MDA含量、可溶性糖含量和Pro含量变化趋势存在差异,SPAD值随着生育期的推进逐渐降低。根据各生理指标进行隶属函数分析,‘中薯28号’和‘中薯9号’在苗期、块茎形成期和块茎膨大期的平均隶属函数值分别为0.6239、0.5432、0.8148和0.5612、0.4887、0.7042,为相对抗旱的马铃薯品种。该研究结果为评定马铃薯抗旱性指标提供了数据支撑,对筛选抗旱马铃薯品种具有重要参考价值。

With the rapid development of potato industry,potato as staple food has gradually become a world trend,and accelerating the development process of the potato industry is of great significance for the development of agriculture in China.To select drought-resistant potato varieties suitable for planting in Inner Mongolia Autonomous Region,the physiological indicators of 18 potato varieties under drought stress in field conditions were measured at the seedling,tuber formation,and tuber bulking stages.Peroxidase(POD)activity and superoxide dismutase(SOD)activity of potato leaves generally showed a trend of first increasing and then decreasing and SPAD value gradually decreased as the growth period progressed under drought stress treatment.No clear change pattern was found for malondialdehyde(MDA)content,soluble sugar content and proline(Pro)content in the 18 varieties tested.Membership function analysis was performed based on various physiological indicators.The average membership function values of'Zhongshu 28'and'Zhongshu 9'at seedling,tuber formation and tuber bulking stages were 0.6239,0.5432,0.8148 and 0.5612,0.4887,0.7042,respectively,indicating that they are relatively drought-resistant potato varieties.The results of this study provide data support for evaluating drought resistance index of potato and have important reference value for selecting droughtresistant potato varieties.