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| Relationship between Root Rot Resistance and Phenylaprapanoid Metabolism in Graft Capsicum |
| JIANG Fei1，LIU Ye-xia1，LIU Wei1，ZHENG Nan1，WANG Hong-tao2，AI Xi-zhen1* |
| 1College of Horticulture Science and Engineering，Shandong Agricultural University，State Key Laboratory of Crop Biology，Key Laboratory of Horticultural Crop Biology，Ministry of Agriculture，Tai’an 271018，Shandong，China；2Zaozhuang Agriculture Demonstration Garden，Zaozhuang 277300，Shandong，China |
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Abstract Changes of disease incidence and disease index of root rot in different rootstock varieties of capsicum（Capsicum annuum L.）were investigated by manual inoculation，with ‘Chifengtexuan’（Capsicum annuum L. var. grossum Bailey）as control．The result showed that‘Weishi’was taken sick later，and had the lowest disease incidence and disease index．This indicated it possessed strong disease resistance among the four rootstock varieties and the control．Effect of grafting on root rot resistance and phenylaprapanoid metabolism of capsicum were investigated with‘Chifengtexuan’scion grafted onto‘Weishi’rootstock．The own-root plant was acting as control．The results showed that the disease incidence and disease index of grafted plants were lower than those of CK，but higher than those of rootstock plants．Before inoculation，rootstock and grafted plants showed higher soluble sugar content and PAL activity in roots，but lower soluble sugar content and PAL activity in leaves，compared with the control．Similar phenolic compounds and lignin contents were found in roots and leaves of rootstock，grafted and control plants before inoculation．The soluble sugar content in roots of rootstock，grafted and control plants decreased gradually after inoculation，PAL activity，contents of phenolic compounds and lignin increased at earlier stage，but trended to stabilize or decrease 10 days later．Rootstock and grafted plants showed significantly higher PAL activity and contents of phenolic compounds and lignin in roots and leaves than the control plants．Soluble sugar content in roots of rootstock and grafted plants were also higher than that of the control plants，but in leaves were lower than the control plants．These data indicated that grafting could significantly increase the root rot resistance in capsicum，and its disease resistant mechanism is closely related to the increase of phenylaprapanoid metabolism.
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Received: 14 January 2010
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Corresponding Authors:
AI Xi-zhen
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