多胺与香蕉抗寒性的关系的研究

人工气候箱中模拟寒潮对香蕉苗造成低温伤害,低温胁迫前用1 mmol·L-1多胺(PAs)和D-精氨酸(D-Arg)喷洒香蕉叶片。结果表明,低温胁迫后香蕉叶片内源腐胺(Put)含量下降,亚精胺(Spd)含量明显增多,精胺(Spm)比较稳定;D-Arg处理的内源多胺总量明显降低。外源Spd和Spm可以提高受冷胁迫的香蕉叶片中过氧化物酶(POD)活性、降低电解质渗漏率、增加可溶性糖和脯氨酸的含量,有助于提高香蕉的抗寒力;Put对香蕉抗寒力没有明显影响;D-Arg则有不利作用。

Studies on the relation of polyamines and cold-resistance of banana

The plantlets of banana(Musa acuminate(AAA group)'Dwarf Cavendish'BraziDsuffered from low-temperature stress caused by the artificial lowering of temperature in the phytotron. 1 mmol · L-1 polyamines (PAs) and D-Arginine(D-Arg) sprayed on the banana leaves before the chilling stress. The experiments suggested that endogenous putrescine(Put)content dropped dramatically,but endogenous spermidine(Spd)content increased obviously and spermine(Spm)content stabilized in banana leaves suffered by chilling stress;Endogenous polyamine contents dropped obviously in banana leaves suffered by D-Arginine treatment. Activities of peroxidase(POD)and contents of soluble sugars and proline were increased,and relative electric leakage of cy-toplasmic membranes were reduced in banana leaves by Spd and Spm treatments. So the results is that Spd and Spm can increase the ability of cold-resistance,but Put may have a less role and D-Arg has opposite role in the ability to cold-resistance.