干旱胁迫对马铃薯品种生长及生理生化指标的影响

Effects of Drought Stress on Growth and Physiological and Biochemical Indexes of Potato Varieties

研究了干旱胁迫下不同马铃薯品种的抗旱生理机制,为马铃薯抗旱育种和栽培提供理论依据。本试验以‘冀张薯8号’、‘冀张薯12号’、‘克新1号’为材料,在抗旱棚中研究不同干旱胁迫处理下马铃薯生长及生理生化指标的变化,并分析评价其抗旱性。结果表明:干旱胁迫下马铃薯的产量、株高、茎粗、茎叶鲜重等生长指标均显著降低;随着胁迫程度的增加,3个品种过氧化物酶活性均逐渐升高,超氧化物歧化酶活性均呈现先升高后降低的趋势,而可溶性蛋白含量均呈现逐渐增加的趋势,但品种间3个指标变化的幅度不同,‘冀张薯8号’、‘冀张薯12号’上升的幅度高于‘克新1号’;随着干旱胁迫程度的增加,3个品种的组织相对含水量均逐渐降低。通过抗旱性综合分析和评价,抗旱性从大到小依次为‘冀张薯8号’‘、冀张薯12号’‘、克新1号’。研究结果说明抗旱性强的马铃薯品种通过一系列的生理生化的变化,具备较强的抵御干旱胁迫的能力。

This experiment studied the physiological mechanism of different potato varieties under drought stress, so as to provide a theoretical basis for potato drought resistance breeding and cultivation.‘Jizhangshu No.8’,‘Jizhangshu No.12’and‘Kexin No.1’were used to study the changes of potato growth and physiological and biochemical indexes under different drought stress treatments in the shed, and evaluate their drought resistance. The results showed that the growth indexes, such as yield, plant height, stem diameter and stem-leaf fresh weight, decreased significantly under drought stress. With the increase of stress degree, the peroxidase activity(POD) of the three varieties increased gradually, and the superoxide dismutase(SOD)activities increased first and then decreased,and the soluble protein content displayed an increasing trend.Additionally, the variation level of the three indexes were different among the three varieties, and the rising range of the indexes of‘Jizhangshu No.8’and‘Jizhangshu No.12’were higher than that of‘Kexin No.1’.Moreover, the tissue relative water content decreased gradually when the drought stress was increased. The order of drought resistance from strong to low was‘Jizhangshu No.8’,‘Jizhangshu No.12 ’and‘Kexin No.1’through comprehensive analysis and evaluation. The results showed that potato varieties obtained strong drought resistance by a series of physiological and biochemical changes.