[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.
Feng
Zhaozhong
Z
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. zhzfeng201@sina.com.cn
Wang
Jing
J
Feng
Zongwei
Z
D003080:Cold Temperature; D018553:Cucumis sativus / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D005659:Fungicides, Industrial / Q000494:pharmacology*; D008315:Malondialdehyde / Q000032:analysis; D036226:Seedlings / Q000187:drug effects* / Q000254:growth & development; D013482:Superoxide Dismutase / Q000378:metabolism; D014230:Triazoles / Q000494:pharmacology*
D005659:Fungicides, Industrial; D014230:Triazoles; C032910:triadimefon; D008315:Malondialdehyde; D013482:Superoxide Dismutase