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园艺学报 ›› 2007, Vol. 34 ›› Issue (3): 629-636.

• 蔬菜 • 上一篇    下一篇

辣椒N 基因介导抗根结线虫作用早期表达基因的抑制性消减杂交SSH分析

茆振川1,2 ;谢丙炎2*
; 杨宇红2 , 冯东昕2 ;冯兰香2; 杨之为1
  

  1. (1 西北农林科技大学植物保护学院, 陕西杨凌712100; 2 中国农业科学院蔬菜花卉研究所, 北京100081)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-06-25 发布日期:2007-06-25

Analysis of Early Expression Genes Resistance to Root Knot Nema tode in NGene Pepper by SSH

MAO Zhen-chuan1,2 ; XIE Bing-yan2*
;YANG Yu-hong2; FENG Dong-xin2 ;FENG Lan-xiang2 ;
YANG Zhi-wei1   

  1. (1 College of Plant Protection, N orthwest A & F University, Yangling, Shaanxi 712100, China; 2 Institute of Vegetables andFlowers, Chinese Academy of Agricultural Sciences, B eijing 100081,China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-06-25 Published:2007-06-25

摘要: 以含N 基因的辣椒(Capsicum annuum L. ) 为试验材料, 接种南方根结线虫(Meloidogyne in
cognita
) 12、24、36 h的根尖材料作为测验方( tester) , 相应的未接种根尖材料作为驱动方( driver) , 构
建一个南方根结线虫诱导N 基因表达早期的正向抑制消减杂交cDNA文库, 并结合文库高密度点阵膜杂交
差异筛选, 获得了237条表达序列标签( EST) 。在GenBank上进行BLASTn与BLASTx分析, 得到148条
功能已知的EST序列, 获得已知的上调抗性相关EST 68个。分离出了具有NBS2LRR结构的抗线虫蛋白和
类LRR抗性蛋白的基因, 防御作用相关的类萌芽素(GLP) 、HSR203J 蛋白、蜜腺蛋白、蛇毒素肽等基因,
抗性相关的WRKY、ERFBP等转录因子基因, 以及G蛋白、142323蛋白等多种信号蛋白基因。通过Gene
Ontology分析, N 基因介导的早期表达抗病基因涉及病原物的识别、抗性信号传导、过敏性坏死、系统获得
性抗性以及植物细胞保护机制等多个方面, 并有许多功能未知的基因有待于进一步的研究。

关键词: 根结线虫, 辣椒, N 基因, 抑制性消减杂交, 抗线虫相关基因

Abstract: The nematode resistant gene N is a single dominant gene in pepper cultivar CarolinaWonder
(Capsicum annuum L. ). To investigate the early up2regulated exp ression genes p rofile in cultivar Carolina
Wonder induced by root2knot nematode (Meloidogyne incognita, RKN) , a forward subtracted cDNA library
was constructed using supp ression subtractive hybridization ( SSH). The cDNA of pepper seedling root tip s in
oculated with J2 RKN for 12, 24 and 36 h were used as tester and that from untreated root tip s as driver. To
tally 237 RKN2induced SSH cDNA fragments were selected with DIG Nonradioactive Nucleic Acid Labeling
and Detection System. Based on the sequencing and BLAST analyzing of 148 fragments, 68 up2regulated ex
p ression EST fragmentswere identified, including the genes encode nucleotide2binding site / leucine-rich repeat
(NBS2LRR) disease resistant p roteins and LRR resistance p rotein2like; some defense p roteins, such as Germ
in2like p rotein, HSR203J p rotein2like, Nectarin, and Snakin22; some biostress resistance related transcrip tion
factor likeWRKY and ERFBP; some signal p roteins, such as GRP2like p rotein and 142323 family p rotein.
The Gene Ontology analysis revealed that the up2regulated ESTs involved in the recognition to nematode, sig
nal transduction, p rotection mechanism, HR and SAR. In addition, some ESTs of unknown function may benovel genes.

Key words: Root-knot nematode, Pepper, N gene, Suppression subtractive hybridization ( SSH ), Resistant-nematode gene