三唑酮对黄瓜幼苗生长及抗寒性的影响

研究了不同浓度三唑酮浸种对黄瓜幼苗生物量及抗寒性的影响。结果表明，20～100μmol·L^-1三唑酮能显著抑制黄瓜幼苗的株高、根长，增加了根重、根冠比和叶绿素含量，30d幼苗经过3d低温胁迫后，10～50μmol·L^-1三唑酮处理能保持较高的叶绿素含量，有效地降低质膜相对透性，维持较高的SOD活性，50μmol·L^-1三唑酮处理明显减缓低温胁迫过程中MDA的累积。另外，50μmol·L^-1三唑酮处理在低温胁迫第1d促进脯氨酸的累积，在第3d脯氨酸反而低于对照。但高浓度(>100μmol·L^-1)三唑酮不利于幼苗抵御低温伤害，总的来看，三唑酮增强了黄瓜幼苗的耐寒性。

Effect of triadimefon on cucumber seedlings growth and their resistance to chilling injury

Studies on the effects of different concentrations of triadimefon on cucumber seedlings growth and their resistance to chilling injury showed that 20-100 mumol.L-1 triadimefon inhibited the shoot or root length of cucumber seedlings, and increased their root weight or root/shoot ratio and chlorophyll content significantly. After at low temperature for 3 days, a higher chlorophyll content, lower membrane relative permeability and higher SOD activity were observed in the leaves of cucumber seedlings soaked with 10-50 mumol.L-1 triadimefon. 50 mumol.L-1 triadimefon could retard the accumulation of MDA at low temperature stress. It was also observed that 50 mumol.L-1 triadimefon enhanced the accumulation of praline at the first day of chilling treatment. However, higher concentrations(> 100 mumol.L-1) of triadimefon were unfavorable for cucumber seedlings to defense against low temperature. It was thus concluded that triadimefon protected the cucumber seedlings against low temperature.