硝普钠对燕麦幼苗苗期盐胁迫缓解作用的生理机制

在150 mmol·L-1 NaCl胁迫下,研究了喷施不同浓度硝普钠(SNP)对青燕1号(Avena sativa cv. Qingyan No.1)、青引2号(A. sativa cv. Qingyin No.2)、林纳(A. sativa cv. Lena)3种燕麦苗期的叶绿素、丙二醛(MDA)、超氧化物歧化酶(SOD)、过氧化物酶(POD)及过氧化氢酶(CAT)的活性的影响。结果表明,不同浓度(0.05、0.10、0.20 mmol·L-1)的硝普钠使3种燕麦的叶绿素含量、SOD、POD和CAT活性较单盐组显著增加(P0.05),MDA含量显著降低,不同程度地缓解了盐胁迫(150 mmol·L-1 NaCl)对燕麦造成的伤害,而且这种缓解作用存在剂量效应,以0.10 mmol·L-1的处理效果最显著(P0.05),且品种间存在差异,对青引2号的缓解作用最强。

Effects of sodium nitroprusside on physiological characteristics of oat seedling under salt stress

Effects of sodium nitroprusside (SNP) on physiology response of 3 Avena sativa cultivars seedling including Qingyan No.1, Qingyin No.2 and Lena to 150 mmol·L-1 NaCl stress were studied by measuring the contents of chlorophyll and malondialdehyde (MDA) and the activities of antioxidant enzymes.The results showed that application of different SNP concentrations (0.05, 0.10 and 0.20 mmol·L-1) after NaCl stress treatment improved the activities of SOD, POD and CAT and the contents of chlorophyll and reduced MDA contents in all of the three studied oat cultivars compared with salt stress seedling without SNP which indicated that SNP can relieve the damages of salt stress on oat seedlings. However, these relieve effects depended on the SNP concentration and cultivars so that the effects of 0.10 mmol·L-1 SNP treatment were best and Qingyin No.2 performed best.