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研究了在缺镁胁迫下,外源NO对缺镁玉米幼苗生长、根系活力和离子含量的影响。结果表明,缺镁胁迫使玉米幼苗株高、根长和干鲜重下降,根系活力降低,N元素在地上部和根部分配失调,新叶和老叶中Mg2+、Cu2+、Fe3+、Mn2+等离子含量下降,Ca2+、K+、Zn2+等离子含量上升。根中Mg2+离子含量下降,Ca2+、K+、Zn2+、Cu2+、Fe3+、Mn2+等离子含量上升。用100μmol·L-1一氧化氮供体硝普钠(SNP)处理后,玉米幼苗株高、根长、干重和鲜重均提高,根系活力增强,改善了N代谢,新叶中Ca2+、K+和Zn2+等离子含量下降,Mg2+、Cu2+、Fe3+和Mn2+等离子含量提高,老叶中Mg2+、Ca2+、K+和Zn2+等离子含量下降,Cu2+、Fe3+和Mn2+等离子含量提高,根中Mg2+、Ca2+、K+、Cu2+、Zn2+、Fe3+和Mn2+离子含量均下降。实验结果表明,NO保护玉米幼苗免受缺镁胁迫的影响。
The effects of exogenous NO on the growth, root activity and ion content of maize deficient maize seedlings under magnesium deficiency were studied. The results showed that under magnesium deficiency, the plant height, root length, dry and fresh weight of maize seedlings decreased, the root activity decreased, the N content was imbalanced above and below the roots, and the contents of Mg2 +, Cu2 +, Fe3 + and Mn2 + in new leaves and old leaves decreased , Ca2 +, K +, Zn2 + plasma content increased. The content of Mg2 + in roots decreased and the content of Ca2 +, K +, Zn2 +, Cu2 +, Fe3 + and Mn2 + increased. The plant height, root length, dry weight and fresh weight of corn seedlings increased with 100 μmol·L-1 nitric oxide donor sodium nitroprusside (SNP), the root activity increased, N metabolism was improved, Ca2 + The contents of Mg2 +, Cu2 +, Fe3 + and Mn2 + in the old leaves decreased, the plasma contents of Mg2 +, Ca2 +, K + and Zn2 + decreased and the contents of Cu2 +, Fe3 + and Mn2 + , Zn2 +, Fe3 + and Mn2 + ion content decreased. The experimental results show that NO protect corn seedlings from magnesium deficiency stress.