水分胁迫对小麦幼苗叶片多胺含量的影响

Effect of Water Stress on Polyamine Contents in Leaves of Wheat Seedlings

水分胁迫下小麦幼苗叶片多胺含量变化的研究表明,聚乙二醇(PEG)的渗透胁迫明显提高了抗旱性强的周麦系列幼苗叶片游离态Put、Spd和Spm的含量和抗旱性弱的温麦6号的Put含量。外源Spd显著提高了水分胁迫下温麦6号的Spd的含量,对其抗性也有所改善。外源MGBG(Spd和Spm生物合成抑制剂)可提高水分胁迫下周麦12号Put的含量,但降低了Spd和Spm的含量和幼苗的抗性。

Polyethylene glycol (PEG) induced osmotic stress increased the contents of putrescine (Put), spermidine (Spd) and spermine (Spm) in seedlings of drought-resistant wheat strains Zhou and the content of Put in seedlings of drought-sensitive wheat Wen 6. Exogenous Spd (1 mmol/L) obviously increased the content of Spd in seedlings of Wen 6 and its resistance to water stress increased to some extent. Methylglyoxyl-bis (guanylhydrazone) (MGBG,1 mmol/L), an inhibitor of biosynthesis of Spd and Spm, increased the content of Put in wheat seedlings of Zhou 12 under water stress, but decreased the contents of Spd and Spm as well as its drought resistance.