TOEFL TPO -1 Writing Task 2 Sample: Thesis abstract

1.子项得分 任务完成度: 4 组织: 4 连贯与衔接: 4 语言使用: 4

2.预估分数 总分: 25

3.任务完成度 整体来说，文章内容较为完整，但在某些方面还有待改进。首先，题目要求写一个论文摘要，但文章开头并没有明确地提出论文的主题。其次，在研究方法部分，可以更详细地描述实验设计和数据处理方法。最后，在结论部分，可以总结研究结果及其对相关领域的意义。

改进示例1（英文）： Instead of "Corn is one of the world's most important food crops...", you can start with "This thesis aims to investigate the resistance mechanism of maize against corn anthracnose leaf blight and identify pathogenic genes in Colletotrichum graminicola."

改进示例2（英文）： In the conclusion, you can add a sentence like "Our findings contribute to a better understanding of the disease resistance mechanism in maize and provide valuable insights for future breeding programs and disease control strategies."

4.文章结构与组织 文章的结构基本合理，但在某些方面仍有改进空间。首先，在引言部分，可以更明确地阐述论文的主题和目标。其次，在各段落之间加入过渡句子以增强连贯性。最后，在结论部分进行总结，并指出研究的意义和影响。

改进示例1（英文）： To improve the introduction, you can add a sentence like "In this study, we aim to explore the molecular mechanisms underlying maize resistance to corn anthracnose leaf blight and identify key genes involved in the pathogenicity of Colletotrichum graminicola."

改进示例2（英文）： To enhance coherence between paragraphs, you can add transition sentences like "Having identified the candidate resistance genes in maize, we then proceeded to investigate the pathogenic genes in Colletotrichum graminicola."

5. 语法批改

Corn is one of the world's most important food crops and is used for feed, wine and other purposes. Corn anthracnoseanthracite(misspelling) leaf blight is one of the most important diseases on maize in the world, which is distributed in 78 countries and regions in the world. Corn[No Replacement Word Found](Successive sentences beginning with the same word) anthracnoseanthracite(misspelling) leaf blight is caused by pathogen is Colletotrichum[No Replacement Word Found](misspelling) graminicola[No Replacement Word Found](misspelling) and mainly occurs in warm and humid corn producing areas. The pathogenic bacteria live in a semi-biotrophic[No Replacement Word Found](misspelling) way, parasitizing on living tissue firstly and continuing their life cycle on dead tissue later. The pathogen can invade almost all parts of maize such as leaves, stalk and roots during the whole growth period of maize, which will affect the quality and yield of maize. Therefore, it is very important to study the mechanism of interaction between the pathogen and the maize as well as the method for pathogen control. My research focuses on the screening of RALB1 resistance genes, analysis of RALB1 resistance mechanism to corn anthracnoseanthracite(misspelling) leaf blight and identification of genes related to its pathogenicitypathogenic(misspelling) in Colletotrichum[No Replacement Word Found](misspelling) graminicola[No Replacement Word Found](misspelling), and studying the interaction between the pathogen and its host plants. The screening and study of resistance genes to anthracnoseanthracite(misspelling) leaf blight can lay a foundation for disease resistance breeding. The study of pathogenic genes in Colletotrichum[No Replacement Word Found](misspelling) graminicola[No Replacement Word Found](misspelling) has certain significance for the prevention and control of this pathogen, and may provide reference value for other related studies. For the study of resistance genes, the first is transcriptomic analysis at different time points after inoculation of pathogens on resistant maize leaves. The candidate genes were selected according to gene information and transcription level, and RT-qPCR[No Replacement Word Found](misspelling) assay was performed to verify the genes. After further analysis, candidate genes in maize were silenced using VIGSPIGS(misspelling) technology, and inoculation pathogens were identified for changes in inoculation phenotype to determine whether the gene played a role in the resistance response. For the study of effectors, we used SignalPSignal(misspelling) v4.1, TMHMM v2.0 and other tools to predict the effector genes. Then the CRISPR-Cas9-based gene knocking-out technique was used to knock out the candidate genes. The Southern Blot was applied to verify the knock-out. And the Yeast signal trap assay as well as the Western Blot were used to verify the secretion of the candidate effectors. And the subcellular localizations of the candidate genes were observed by the fusion of the genes with the eGFPEGF(misspelling) using confocal microscope. The Y2H Screening assay was used[No Replacement Word Found](Passive voice (repetition experiment)) to screen and identify the interacting proteins of the effectors.

6.文章修订

Corn anthracnose leaf blight, caused by the pathogen Colletotrichum graminicola, is a significant disease affecting maize worldwide. This thesis aims to investigate the resistance mechanism of maize against corn anthracnose leaf blight and identify pathogenic genes in Colletotrichum graminicola. Understanding these mechanisms is crucial for developing effective disease control strategies and improving maize breeding programs.

Our research focuses on screening RALB1 resistance genes, analyzing the RALB1 resistance mechanism to corn anthracnose leaf blight, and identifying genes related to its pathogenicity in Colletotrichum graminicola. Furthermore, we study the interaction between the pathogen and its host plants. The identification and analysis of resistance genes to anthracnose leaf blight can lay a foundation for disease-resistant breeding efforts. Studying pathogenic genes in Colletotrichum graminicola has significant implications for the prevention and control of this pathogen and may provide reference value for other related studies.

To study resistance genes, we first conducted transcriptomic analysis at different time points after inoculation of pathogens on resistant maize leaves. We selected candidate genes based on gene information and transcription levels, then performed RT-qPCR assays to verify these genes. After further analysis, we silenced candidate genes in maize using VIGS technology and inoculated pathogens to identify changes in inoculation phenotype, determining whether the gene played a role in the resistance response.

Having identified candidate resistance genes in maize, we then proceeded to investigate the pathogenic genes in Colletotrichum graminicola. For this purpose, we used SignalP v4.1, TMHMM v2.0, and other tools to predict effector genes. We employed CRISPR-Cas9-based gene knockout techniques to knock out candidate genes and used Southern Blot to verify the knockout. Additionally, we utilized Yeast signal trap assays and Western Blot to confirm the secretion of candidate effectors. We observed the subcellular localizations of candidate genes by fusing them with eGFP using a confocal microscope. Finally, we applied Y2H Screening assays to screen and identify interacting proteins of the effectors.

In conclusion, our study contributes to a better understanding of the disease resistance mechanism in maize and provides valuable insights for future breeding programs and disease control strategies. By exploring the molecular mechanisms underlying maize resistance to corn anthracnose leaf blight and identifying key genes involved in the pathogenicity of Colletotrichum graminicola, we can enhance our ability to combat this devastating disease and improve global food security.

Word count: 450 (385 words)

Corn is one of the world's most important food crops and is used for feed, wine and other purposes. 7.文章批改

Corn anthracnose leaf blight is one of the most important diseases on maize in the world, which is distributed in 78 countries and regions in the world. Corn anthracnose leaf blight is blight, caused by the pathogen Colletotrichum graminicola, is Colletotrichum graminicola and mainly occurs in warm and humid corn producing areas. The pathogenic bacteria live in a semi-biotrophic way, parasitizing on living tissue firstly and continuing their life cycle on dead tissue later. The pathogen can invade almost all parts of maize such as leaves, stalk and roots during the whole growth period of maize, which will affect the quality and yield of maize. Therefore, it is very important to study the a significant disease affecting maize worldwide. (I added this sentence to provide a clear and concise introduction to the topic.) This thesis aims to investigate the resistance mechanism of interaction between the pathogen and the maize as well as the method for pathogen control. ¶ My research focuses on the screening of RALB1 resistance genes, analysis of RALB1 resistance mechanism to maize against corn anthracnose leaf blight and identification of identify pathogenic genes in Colletotrichum graminicola. (I rephrased this sentence to clearly state the purpose of the thesis.) Understanding these mechanisms is crucial for developing effective disease control strategies and improving maize breeding programs.

Our research focuses on screening RALB1 resistance genes, analyzing the RALB1 resistance mechanism to corn anthracnose leaf blight, and identifying genes related to its pathogenicity in Colletotrichum graminicola, and studying graminicola. (I made minor edits for clarity.) Furthermore, we study the interaction between the pathogen and its host plants. The screening and study identification and analysis of resistance genes to anthracnose leaf blight can lay a foundation for disease resistance breeding. The study of disease-resistant breeding efforts. Studying pathogenic genes in Colletotrichum graminicola has certain significance significant implications for the prevention and control of this pathogen, pathogen and may provide reference value for other related studies.

For the To study of resistance genes, the we first is conducted transcriptomic analysis at different time points after inoculation of pathogens on resistant maize leaves. The candidate genes were (I rephrased this sentence for clarity.) We selected according to candidate genes based on gene information and transcription level, and levels, then performed RT-qPCR assay was performed assays to verify the these genes. After further analysis, candidate genes in maize were we silenced candidate genes in maize using VIGS technology, and technology and inoculated pathogens to identify changes in inoculation pathogens were identified for changes in inoculation phenotype to determine phenotype, determining whether the gene played a role in the resistance response.

Having identified candidate resistance genes in maize, we then proceeded to investigate the pathogenic genes in Colletotrichum graminicola. (I added this sentence to provide a smooth transition between paragraphs.) For the study of effectors, this purpose, we used SignalP v4.1, TMHMM v2.0 v2.0, and other tools to predict the effector genes. Then the We employed CRISPR-Cas9-based gene knocking-out technique was used knockout techniques to knock out the candidate genes. The candidate genes and used Southern Blot was applied to verify the knock-out. And the knockout. Additionally, we utilized Yeast signal trap assay as well as the assays and Western Blot were used to verify to confirm the secretion of the candidate effectors. And We observed the subcellular localizations of the candidate genes were observed candidate genes by the fusion of the genes fusing them with the eGFP using a confocal microscope. The Finally, we applied Y2H Screening assay was used assays to screen and identify the interacting proteins of the effectors.effectors.

In conclusion, our study contributes to a better understanding of the disease resistance mechanism in maize and provides valuable insights for future breeding programs and disease control strategies. (I added this sentence to summarize the findings and their implications.) By exploring the molecular mechanisms underlying maize resistance to corn anthracnose leaf blight and identifying key genes involved in the pathogenicity of Colletotrichum graminicola, we can enhance our ability to combat this devastating disease and improve global food security. (I rephrased this sentence for clarity.)

Word count: 450

8.思维导图

• Thesis statement

  • Investigate resistance mechanism of maize against corn anthracnose leaf blight
  • Identify pathogenic genes in Colletotrichum graminicola

• Topic sentences

  • Importance of understanding resistance mechanisms
  • Research focus on screening RALB1 resistance genes and analyzing the mechanism
  • Studying interactions between the pathogen and host plants

• Sub-topics

  • Transcriptomic analysis of resistant maize leaves after inoculation
  • Selection and verification of candidate genes using RT-qPCR assays
  • Silencing candidate genes using VIGS technology to determine their role in resistance response
  • Prediction and knockout of effector genes in Colletotrichum graminicola using bioinformatics tools and CRISPR-Cas9 techniques

• Supporting examples

  • Yeast signal trap assays and Western Blot for verifying secretion of candidate effectors
  • Observation of subcellular localizations using confocal microscopy with eGFP fusion proteins

• Conclusions

  • Contribution to a better understanding of disease resistance mechanisms in maize
  • Valuable insights for future breeding programs and disease control strategies

9.关键词

10.补充示例

1. Maize varieties with natural resistance to corn anthracnose leaf blight can be identified and used in breeding programs, reducing the need for chemical treatments and promoting sustainable agriculture.

2. The development of diagnostic tools for early detection of corn anthracnose leaf blight can help farmers take preventive measures, minimizing crop losses and ensuring food security.

3. Understanding the molecular mechanisms behind maize resistance to corn anthracnose leaf blight can lead to the discovery of novel targets for fungicides, offering new options for disease control.

4. Studying the interactions between Colletotrichum graminicola and its host plants can reveal potential weak points in the pathogen's life cycle, which could be exploited for disease management.

5. Insights gained from research on corn anthracnose leaf blight can be applied to other plant-pathogen systems, contributing to a broader understanding of plant disease resistance and pathogenicity mechanisms.