Scientia Agricultura Sinica ›› 2013, Vol. 46 ›› Issue (14): 2963-2969.doi: 10.3864/j.issn.0578-1752.2013.14.012

• HORTICULTURE • Previous Articles     Next Articles

Effect of Grafting on Secondary Metabolism and Its Relationship with Bacterial Wilt Resistance in Pepper

 LIU  Ye-Xia-1, FU  Ling-1, AI  Xi-Zhen-1, WANG  Hong-Tao-2, JI  De-Gang-2   

  1. 1.College of Horticultural Science and Engineering, Shandong Agricultural University/State Key Laboratory of Crop Biology/Key Laboratory of Horticultural Crop Biology and Germplasm Innovation, Ministryof Agriculture, Tai’an 271018, Shandong
    2.Zaozhuang Agricultural Demonstration Garden, Zaozhuang 277300, Shandong
  • Received:2012-10-29 Online:2013-07-15 Published:2013-05-08

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Abstract: 【Objective】 The purpose of this study is to elucidate the phenolic acids metabolism in grafted pepper and its function in improvement of bacterial wilt resistance. 【Method】 Changes of the electrolyte leakage (EL), hydrongen peroxide (H2O2) content, phenolic acids and activities of the related enzymes in grafted (‘Xinfeng 2’ scion grafted onto ‘Weishi’) and own-root plants (‘Xinfeng 2’, control) of pepper were investigated by manual inoculation. 【Result】The results showed that the EL in leaves of grafted and own-root peppers all increased gradually after inoculation, whereas the increasing range in grafted plants was less than that in control plants. Grafted pepper showed an increase in H2O2 contents in leaves and roots at early stage, but a decrease after 6-8 days of inoculation. Compared with the control plants, grafted plants showed higher contents of vanillin, salicylic acid and lignin, and activities of phenylalanine ammonia lyase (PAL) and polyphenoloxidase (PPO). 【Conclusion】The increased phenolic acids synthesis and secretion in grafted plants is one of the important reasons for enhancement in disease resistance. The salicylic acid and vanillin played the major role in improving disease resistance of grafted pepper plants.

Key words: graft , bacterial wilt , electrolyte leakage , phenolic acid , pepper

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