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| Relationship between Phenylpropanes Metabolism and Grafted Cucumber Resistance to Southern Root-knot Nematode |
| ZHANG Yu, LIU Shi-qi*, ZHANG Zi-kun, YANG Xiao-jian, MA Lin, HUANG Zhi-jun, CHEN Kun |
| College of Horticulture Science and Engineering, State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an 271018, Shandong, China |
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Abstract To find out the relationship between the resistance to root-knot nematode and phenylpropanes metabolism in grafted cucumber（Cucumis sativus L.）seedlings, the effects of infection of southern root-knot nematode on phenylpropanes and key enzymes index were measured by artificial grafting of pot cucumber seedlings. The results showed that after infected by southern root-knot nematode, the contents of total phenols and lignin, and the activities of phenylalanine ammonia-lyase（PAL）, tyrosine ammonia lyase（TAL）and polyphenol oxidase（PPO）were significantly higher than those in self-root seedlings, while the contents of cellulose had little change and the index of root-knot nematode even declined. We concluded that phenylpropane metabolites and key enzymes had close correlation with resistance to southern root-knot nematode in grafted cucumber seedlings. Further studies disclosed that the resistances of 6 rootstocks to southern root-knot nematode were different with the sequence of DTT-RS-39（T4）>‘Gailianghuofenghuang’（T0）>‘Huofenghuang’（T1）>‘Juejinglong’（T3）>‘Youqingtaimu’（T2）>‘Heizinangua’（T5）.
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Received: 24 August 2010
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