Acta Agriculturae Boreali-Sinica ›› 2022, Vol. 37 ›› Issue (2): 211-222. doi: 10.7668/hbnxb.20192826

Special Issue: Potato crops Biotechnology

• Resources & Environment·Plant Protection • Previous Articles     Next Articles

Transcriptomic and Expression Analysis of Anthracnose Resistance-related Genes from Yam Suyu 8

HAN Xiaoyong, JIANG Lu, YIN Jianmei, JIN Lin, ZHANG Peitong   

  1. Institute of Economic Crops,Jiangsu Academy of Agricultural Sciences,Nanjing 210014,China
  • Received:2021-10-20 Published:2022-04-28

山药品种苏蓣8号抗炭疽病基因的转录组测序与表达分析

韩晓勇, 蒋璐, 殷剑美, 金林, 张培通   

  1. 江苏省农业科学院 经济作物研究所,江苏 南京 210014
  • 作者简介:
    作者简介:韩晓勇(1983—),男,山西五台人,助理研究员,硕士,主要从事药食同源作物品种选育和机理研究。
  • 基金资助:
    江苏省种业振兴揭榜挂帅项目(JBGS〔2021〕010)

Abstract:

In this study,the transcription level of resistance genes to the infection of Colletotrichum gloeosporioides were explored at the molecular level and provided candidate genes for further study of disease resistance mechanism.Suyu 8 is a new yam variety highly resistant to anthracnose,which was bred by tissue culture mutagenesis of the highly susceptible strain 024.In order to find out the anthracnose resistance genes,Suyu 8 and strain 024 leaves were inoculated for different time by Colletotrichum gloeosporioides strain 4-2,the differentially expressed genes were analyzed by transcriptome sequencing.Concurrently,the uninoculation leaves of Suyu 8 were used as control.The number of differentially expressed genes,inoculation for 24,48,72,96 h,were 197,132,187 and 313,respectively.After removing the common differentially expressed genes at each time point,we obtained 711 differentially expressed genes.Go enrichment showed that the differential genes were mainly related to response to biological stimulation,defense response,cell wall metabolism and oxidation-reduction process.KEGG enrichment analysis revealed that many metabolic pathways related to plant disease resistance were changed.The expression of multiple genes varied which defense-related plant hormone signal transduction pathways,such as auxin,jasmonic acid,and ethylene.Among them,five early auxin-responsive genes,the key genes of jasmonic acid and abscisic acid biosynthesis were up-regulated,while ERF036 was down-regulated,which might negatively regulate the infection of Colletotrichum gloeosporioides.Several cytochrome P450 genes,ubiquitin ligases involved secondary metabolite modification and phytosterol synthetases,defensins and lectins were up-regulated.WRKY,MYB and TIFY transcription factors positively or negatively regulate the expression of disease resistance genes.Under the regulation of transcription factors,PR protein,NBS-LRR disease resistance genes,receptor kinases were highly expressed,the expressions of CAT and SOD genes of antioxidant protective enzyme systems were activated by reactive oxygen species.In addition,the enzymes related to starch and sucrose synthesis were up-regulated,and enzymes related to starch degradation were down regulated.The expression trends of LAX4,IAA4,IAA21 were consistent with that of transcriptome sequencing.The relative expression of LAX4,IAA4 and IAA21 in resistant varieties were significantly higher than susceptible varieties,suggesting that auxin signaling pathway is beneficial to the immune response to anthracnose for yam.

Key words: Yam, Suyu 8, Anthracnose, Transcriptome, Differentially expressed genes

摘要:

为深入研究炭疽病抗病机制提供候选基因,从分子水平探索炭疽菌侵染对山药炭疽病基因转录水平的影响。苏蓣8号是高感炭疽病品系024经组培诱变所育成的高抗炭疽病山药新品种,为挖掘苏蓣8号炭疽病抗性基因,采用胶孢炭疽菌菌株4-2分别接种苏蓣8号和品系024,以未接种苏蓣8号的叶片为对照,利用转录组测序技术分析抗感材料在接种炭疽菌后不同时间点的差异表达基因。结果表明,抗感材料接种24,48,72,96 h共同差异表达基因个数分别为197,132,187,313个,去除各接种时间点共同差异表达的基因数,共获得711个差异表达基因。GO功能富集显示,差异基因主要与响应生物刺激、防卫反应、细胞壁代谢和氧化还原过程等有关。KEGG富集分析表明,生长素、茉莉酸和乙烯等防御相关的植物激素信号转导途径多个基因表达出现差异,其中5个生长素早期响应基因、茉莉酸和脱落酸合成关键酶基因均上调表达,乙烯响应因子ERF036下调表达,可能负向调控山药炭疽菌的侵染;参与次生代谢产物修饰的多个细胞色素P450基因、泛素连接酶及植物甾醇合成酶、防御素和凝集素基因上调表达;WRKY类、MYB类和TIFY类转录因子正向或负向调控抗病基因的表达,受转录调控的PR蛋白、NBS-LRR抗病基因、受体激酶等大量表达,抗氧化保护酶系统CAT和SOD成员在活性氧信号刺激下表达。此外,与淀粉和蔗糖合成有关酶上调表达,与淀粉分解有关酶下调表达。LAX4IAA4IAA21基因表达趋势与转录组测序结果基本一致,且在抗病品种表达量显著高于感病品种,推测生长素信号途径有利于山药对炭疽病的免疫反应。

关键词: 山药, 苏蓣8号, 炭疽病, 转录组, 差异表达基因