Identification of Peanut <i>AhMYB44</i> Transcription Factors and Their Multiple Roles in Drought Stress Responses
MYB transcription factors (TFs) comprise a large gene family that plays an important role in plant growth, development, stress responses, and defense regulation. However, their functions in peanut remain to be further elucidated. Here, we identified six <i>AhMYB44</i> genes (<i>AhM...
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| Format: | Article |
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MDPI AG
2022-12-01
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| Series: | Plants |
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| Online Access: | https://www.mdpi.com/2223-7747/11/24/3522 |
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| author | Yonghui Liu Yue Shen Man Liang Xuyao Zhang Jianwen Xu Yi Shen Zhide Chen |
| author_facet | Yonghui Liu Yue Shen Man Liang Xuyao Zhang Jianwen Xu Yi Shen Zhide Chen |
| author_sort | Yonghui Liu |
| collection | DOAJ |
| description | MYB transcription factors (TFs) comprise a large gene family that plays an important role in plant growth, development, stress responses, and defense regulation. However, their functions in peanut remain to be further elucidated. Here, we identified six <i>AhMYB44</i> genes (<i>AhMYB44-01/11</i>, <i>AhMYB44-05/15</i>, and <i>AhMYB44-06/16</i>) in cultivated peanut. They are typical R2R3-MYB TFs and have many similarities but different expression patterns in response to drought stress, suggesting different functions under drought stress. Homologous genes with higher expression in each pair were selected for further study. All of them were nuclear proteins and had no self-transactivation activity. In addition, we compared the performances of different lines at germination, seedling, and adult stages under drought stress. After drought treatment, the overexpression of <i>AhMYB44-11</i> transgenic plants resulted in the longest root length at the seedling stage. Levels of proline, soluble sugar and chlorophyll, and expression levels of stress-related genes, including <i>P5CS1</i>, <i>RD29A</i>, <i>CBF1</i>, and <i>COR15A</i>, were higher than those of the wild type (WT) at the adult stage. While the overexpression of <i>AhMYB44-16</i> significantly increased the drought sensitivity of plants at all stages, with differential ABA content, the expression levels of the ABA-related genes <i>PP2CA</i> and <i>ABI1</i> were significantly upregulated and those of <i>ABA1</i> and <i>ABA2</i> were significantly downregulated compared with the WT. <i>AhMYB44-05</i> showed similar downregulated expression as <i>AhMYB44-16</i> under drought stress, but its overexpression in <i>Arabidopsis</i> did not significantly affect the drought resistance of transgenic plants. Based on the results, we propose that <i>AhMYB44-11</i> plays a role as a positive factor in drought tolerance by increasing the transcription abundance of stress-related genes and the accumulation of osmolytes, while <i>AhMYB44-16</i> negatively regulates drought tolerance through its involvement in ABA-dependent stress response pathways. |
| first_indexed | 2024-03-09T15:56:44Z |
| format | Article |
| id | doaj.art-ada2fc74d0f44cee90bc771b3ee1f4a5 |
| institution | Directory Open Access Journal |
| issn | 2223-7747 |
| language | English |
| last_indexed | 2024-03-09T15:56:44Z |
| publishDate | 2022-12-01 |
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| spelling | doaj.art-ada2fc74d0f44cee90bc771b3ee1f4a52023-11-24T17:28:44ZengMDPI AGPlants2223-77472022-12-011124352210.3390/plants11243522Identification of Peanut <i>AhMYB44</i> Transcription Factors and Their Multiple Roles in Drought Stress ResponsesYonghui Liu0Yue Shen1Man Liang2Xuyao Zhang3Jianwen Xu4Yi Shen5Zhide Chen6Jiangsu Academy of Agricultural Sciences, Nanjing 210014, ChinaJiangsu Academy of Agricultural Sciences, Nanjing 210014, ChinaJiangsu Academy of Agricultural Sciences, Nanjing 210014, ChinaJiangsu Academy of Agricultural Sciences, Nanjing 210014, ChinaJiangsu Academy of Agricultural Sciences, Nanjing 210014, ChinaJiangsu Academy of Agricultural Sciences, Nanjing 210014, ChinaJiangsu Academy of Agricultural Sciences, Nanjing 210014, ChinaMYB transcription factors (TFs) comprise a large gene family that plays an important role in plant growth, development, stress responses, and defense regulation. However, their functions in peanut remain to be further elucidated. Here, we identified six <i>AhMYB44</i> genes (<i>AhMYB44-01/11</i>, <i>AhMYB44-05/15</i>, and <i>AhMYB44-06/16</i>) in cultivated peanut. They are typical R2R3-MYB TFs and have many similarities but different expression patterns in response to drought stress, suggesting different functions under drought stress. Homologous genes with higher expression in each pair were selected for further study. All of them were nuclear proteins and had no self-transactivation activity. In addition, we compared the performances of different lines at germination, seedling, and adult stages under drought stress. After drought treatment, the overexpression of <i>AhMYB44-11</i> transgenic plants resulted in the longest root length at the seedling stage. Levels of proline, soluble sugar and chlorophyll, and expression levels of stress-related genes, including <i>P5CS1</i>, <i>RD29A</i>, <i>CBF1</i>, and <i>COR15A</i>, were higher than those of the wild type (WT) at the adult stage. While the overexpression of <i>AhMYB44-16</i> significantly increased the drought sensitivity of plants at all stages, with differential ABA content, the expression levels of the ABA-related genes <i>PP2CA</i> and <i>ABI1</i> were significantly upregulated and those of <i>ABA1</i> and <i>ABA2</i> were significantly downregulated compared with the WT. <i>AhMYB44-05</i> showed similar downregulated expression as <i>AhMYB44-16</i> under drought stress, but its overexpression in <i>Arabidopsis</i> did not significantly affect the drought resistance of transgenic plants. Based on the results, we propose that <i>AhMYB44-11</i> plays a role as a positive factor in drought tolerance by increasing the transcription abundance of stress-related genes and the accumulation of osmolytes, while <i>AhMYB44-16</i> negatively regulates drought tolerance through its involvement in ABA-dependent stress response pathways.https://www.mdpi.com/2223-7747/11/24/3522peanutR2R3-MYB TF<i>AhMYB44</i> overexpressiondrought stresstransgenic plant |
| spellingShingle | Yonghui Liu Yue Shen Man Liang Xuyao Zhang Jianwen Xu Yi Shen Zhide Chen Identification of Peanut <i>AhMYB44</i> Transcription Factors and Their Multiple Roles in Drought Stress Responses Plants peanut R2R3-MYB TF <i>AhMYB44</i> overexpression drought stress transgenic plant |
| title | Identification of Peanut <i>AhMYB44</i> Transcription Factors and Their Multiple Roles in Drought Stress Responses |
| title_full | Identification of Peanut <i>AhMYB44</i> Transcription Factors and Their Multiple Roles in Drought Stress Responses |
| title_fullStr | Identification of Peanut <i>AhMYB44</i> Transcription Factors and Their Multiple Roles in Drought Stress Responses |
| title_full_unstemmed | Identification of Peanut <i>AhMYB44</i> Transcription Factors and Their Multiple Roles in Drought Stress Responses |
| title_short | Identification of Peanut <i>AhMYB44</i> Transcription Factors and Their Multiple Roles in Drought Stress Responses |
| title_sort | identification of peanut i ahmyb44 i transcription factors and their multiple roles in drought stress responses |
| topic | peanut R2R3-MYB TF <i>AhMYB44</i> overexpression drought stress transgenic plant |
| url | https://www.mdpi.com/2223-7747/11/24/3522 |
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