河南农业科学 ›› 2019, Vol. 48 ›› Issue (11): 105-111.DOI: 10.15933/j.cnki.1004-3268.2019.11.015

所属专题: 小麦抗病性分析专题

• 植物保护 • 上一篇    下一篇

gdo基因RNAi对小麦全蚀病菌的影响

董振杰1,麦艳娜1,夏晴1,马超1,田修斌1,李欢欢1,刘文轩1,宋玉立2   

  1. 1.河南农业大学 生命科学学院, 河南 郑州 450002; 2.河南省农业科学院 植物保护研究所, 河南 郑州 450002)
  • 收稿日期:2019-03-26 出版日期:2019-11-15 发布日期:2019-11-15
  • 通讯作者: 刘文轩(1964-),男,河南巩义人,教授,博士,主要从事植物分子细胞遗传学研究。E-mail:wxliu2003@hotmail.com 宋玉立(1964-),男,河南南阳人,研究员,博士,主要从事植物病害防治研究。E-mail:songyuli2000@126.com
  • 作者简介:董振杰(1995-),男,河南郑州人,在读硕士研究生,研究方向:小麦抗病遗传改良。E-mail:zhenjiedong@hotmail.com
  • 基金资助:
    国家自然科学基金项目(31571658);河南省科技重大专项(161100110400)

Effects of RNA Interference of gdo on Gaeumannomyces graminis,the Wheat Take-all Fungus

DONG Zhenjie1,MAI Yanna1,XIA Qing1,MA Chao1,TIAN Xiubin1,LI Huanhuan1,LIU Wenxuan1,SONG Yuli2   

  1.  ( 1.College of Life Sciences,Henan Agricultural University,Zhengzhou 450002,China; 2.Institute of Plant Protection,Henan Academy of Agricultural Sciences,Zhengzhou 450002,China)
  • Received:2019-03-26 Published:2019-11-15 Online:2019-11-15

摘要: 为了筛选可利用寄主诱导基因沉默(HIGS)技术防治小麦全蚀病的靶基因,利用RNA干涉(RNAi)技术探讨了编码龙胆酸1,2-双加氧酶(Gentisate 1,2-dioxygenase,GDO)的gdo基因沉默对小麦全蚀病菌KX-7菌丝生长速率和致病能力的影响。结果表明,gdo基因沉默明显抑制全蚀病菌的生长速率,参试30个转化子在PDA平板上的相对生长速率只有野生型对照的20.00%~87.00%。gdo基因沉默转化子使小麦致病力下降,但转化子之间有明显差异。侵染小麦28 d后,L-4转化子的小麦病情指数为39.29,明显低于野生型对照病情指数(75.93)。离体培养结果表明,菌丝相对生长速率和致病能力之间无明显相关关系。4个转化子菌丝在PDA平板上的相对生长速率为S-6(59.00%)=L-2(59.00%)>L-4(42.00%)>M-5(30.00%),受其侵染小麦的病情指数为S-6(84.00)>M-5(77.08)>L-2(62.07)>L-4(39.29)。初步证实gdo基因可以作为HIGS技术防治小麦全蚀病的候选靶基因。

关键词: 小麦全蚀病, 1,2-双加氧酶基因, 遗传转化, RNA干涉, 菌丝相对生长速率, 致病力

Abstract:  In order to select the target genes used in host-inducing gene silencing(HIGS) to protect wheat from damages caused by Ggt(Gaeumannomyces graminis var.tritici) ,the effects on growth and pathogenicity of Ggt fungus KX-7 caused by RNA interference(RNAi) of gdo gene which encodes genti sate 1,2-dioxygenase(GDO) were investigated.The results showed that,gdo gene silencing caused by RNAi obviously inhibited hyphae growth of the fungus.The relative growth rates of hyphae of thirty Ggt transformants in vitro cultured on solid PDA medium were only 20.00%—87.00% of wild type control.gdo RNAi in Ggt cells lessened the pathogenicity of transformants to wheat plants at different extents. Based on wheat resistance evaluation twenty-eight days post inoculation with gdo RNAi transformants,dis ease index of transformant L-4 infected wheat plants was 39.29,obviously lower than wild type control (75.93).The results of in vitro culture showed that there was no obvious correlation between hyphae rela tive growth rate and Ggt pathogenicity.Hyphae relative growth rate of four tested transformants was orderly from high to low by S-6( 59.00%)= L-2( 59.00%) >L-4( 42.00%) >M-5( 30.00%),whereas the disease index of infected plants was in descending order of S-6( 84.00) >M-5( 77.08) >L-2( 62.07) >L-4( 39.29) .This study confirmed that gdo gene could be used as a candidate target gene in HIGS for the protection of wheat from Ggt

Key words:  Wheat take-all, gdo, Genetic transformation, RNAi, Relative growth rate of mycelium; Pathogenicity

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