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
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）.
