Abstract
Anthracnose is a major leaf disease in tea plant induced by Colletotrichum, which has led to substantial losses in yield and quality of tea. The molecular mechanism with regards to responses or resistance to anthracnose in tea remains unclear. A de novo transcriptome assembly dataset was generated from healthy and anthracnose-infected leaves on tea cultivars “Longjing-43” (LJ43) and “Zhenong-139” (ZN139), with 381.52 million pair-end reads, encompassing 47.78 billion bases. The unigenes were annotated versus Gene Ontology (GO), Kyoto Encyclopedia of Genes and Genomes (KEGG), National Center for Biotechnology Information (NCBI) non-redundant protein sequences (Nr), evolutionary genealogy of genes: Non-supervised Orthologous Groups (eggNOG) and Swiss-prot. The number of differential expression genes (DEGs) detected between healthy and infected leaves was 1621 in LJ43 and 3089 in ZN139. The GO and KEGG enrichment analysis revealed that the DEGs were highly enriched in catalytic activity, oxidation-reduction, cell-wall reinforcement, plant hormone signal transduction and plant-pathogen interaction. Further studies by quantitative reverse transcriptase polymerase chain reaction (qRT-PCR) and high-performance liquid chromatography (HPLC) showed that expression of genes involved in endogenous salicylic acid biosynthesis and also accumulation of foliar salicylic acid are involved in the response of tea plant to anthracnose infection. This study firstly provided novel insight in salicylic acid acting as a key compound in the responses of tea plant to anthracnose disease. The transcriptome dataset in this study will facilitate to profile gene expression and metabolic networks associated with tea plant immunity against anthracnose.
Highlights
Anthracnose is a key leaf disease in the tea plant (Camellia sinensis (L.) O
Further studies by quantitative reverse transcriptase polymerase chain reaction and high-performance liquid chromatography (HPLC) showed that expression of genes involved in endogenous salicylic acid biosynthesis and accumulation of foliar salicylic acid are involved in the response of tea plant to anthracnose infection
As we focused on the top 25 Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways (Figure 4), it was found that the differential expression genes (DEGs) were enriched in the pathways involving in plant hormone signal transduction, plant-pathogen interaction, starch and sucrose metabolism and mineral absorption in both cultivars
Summary
Anthracnose is a key leaf disease in the tea plant (Camellia sinensis (L.) O. Revealing molecular defense responses of tea plant to anthracnose infection and developing a molecular assisted selection (MAS) method are badly needed in the tea plant breeding field. When blocked by an inhibitor of phenylpropanoid (precursor of SA) synthesis, the exogenous SA recovered the ability to plant resistance [23] All these show that SA plays the key role and an important signaling effect in plant resistance, especially in systemic acquired resistance [25,26]. Developing a transcriptome assembly dataset generating from anthracnose infected tea leaves will be helpful to reveal the molecular defense responses of tea plant to the anthracnose and to mine molecular markers for MAS used in resistance breeding. 33oof f2121 in which the unigenes were generated and annotated, and important functional genes and metabolic inpawthwichaytshewuenriegeanlseos wreevreagledn.erTahteed daantda asnentsotwatieldl ,parnodvidmeporerftearnetnfcuensctfioornaful grtehneers satnuddymeotnabgoelince peaxthpwreassyisonweprreofailseos, rbevioecahledm.icaTlheprdoacetassseestsanwdillrepgruovlaitdioenrenfeertewnocrekssfoarssfoucritahtedr swtuidthy toena gpelnaent eixmprmesusnioitnypargoafiilnesst, abniotchhreamcniocasel .processes and regulation networks associated with tea plant immunity against anthracnose
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