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| Studies on Cucumber Resistance Mechanism to Powdery Mildew Induced by Choline Chloride |
| CHEN Xi-jun1，SHEN Shi-wei1，CHEN Yin-feng2，ZHANG Qing3*，ZHANG Jia-hao1，ZHANG Xiao-ran1，HUANG Ben-li1* |
| （1Horticulture and Plant Protection College， Yangzhou University， Yangzhou 225009， Jiangsu， China；2Hanjiang District Plant Protection Station， Yangzhou 225000， Jiangsu， China；3Suzhou City Aacademy of Agricultural Sciences，Suzhou 215155， Jiangsu， China） |
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Abstract Choline chloride is a new growth regulator. When the cucumber seedlings were treated
with 10 mmol·L-1 choline chloride，their plant height，root length，dry weight，fresh weight，and
chlorophyll content were remarkably improved．Studies on induce resistance mechanism showed that the
content or activity of β-1，3-glucanase，chitinase，hydroxyproline rich glycoproteins（ HRGP） and
malondialdehyde（MAD）of cucumber seedlings were significantly increased after being treated with
choline chloride．The conidiospores of Sphaerotheca fuliginea were inoculated on the cucumber leaves
treated with choline chloride．The results showed that the germination rate of conidiospores was decline.
The length of germ tubes was shorter and the number of new conidia strings was less than the contrast.
Choline chloride treatment on cucumber plants can delay and all eviate the occurrence of powdery mildew.
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Received: 15 February 2013
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