三唑酮对黄瓜幼苗生长及抗寒性的影响

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

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.30 d幼苗经过3 d低温胁迫后,10～50 μmol·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.50 μmol·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1 d促进脯氨酸的累积.在第3 d脯氨酸反而低于对照.但高浓度(>100 μmol·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.

Studies on the effects of different concentrations of triadimefon on cucumber seedlings growth and their resistance to chilling injury showed that 20 - 100 μmol·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 μmol·L-1 triadimefon. 50 μmol· L-1 triadimefon could retard the accumulation of MDA at low temperature stress. It was also observed that 50 μmol·L-1 triadimefon enhanced the accumulation of praline at the first day of chilling treatment. However, higher concentrations( > 100 μmol ·L-1) of triadimefon were unfavorable for cucumber seedlings to defense a-gainst low temperature. It was thus concluded that triadimefon protected the cucumber seedlings against low temperature.