Abstract
Background
Pepper (Capsicum annum L.) is the main crop in the vegetable industry. The growth and development of peppers are regulated by nitrate, but there is limited research on the molecular mechanisms of nitrate absorption and assimilation in peppers. A plant specific transcription factor NLP plays an important role in nitrate signal transduction.
Methods and results
In this study, a total of 7 NLP members were identified based on pepper genome data. Two nitrogen transport elements (GCN4) were found in the CaNLP5 promoter. In the phylogenetic tree, CaNLP members are divided into three branches, with pepper NLP and tomato NLP having the closest genetic relationship. The expression levels of CaNLP1, CaNLP3, and CaNLP4 are relatively high in the roots, stems, and leaves. The expression level of CaNLP7 gene is relatively high during the 5–7 days of pepper fruit color transformation. After various non-Biotic stress and hormone treatments, the expression of CaNLP1 was at a high level. The expression of CaNLP3 and CaNLP4 was down regulated in leaves, but up regulated in roots. Under conditions of nitrogen deficiency and sufficient nitrate, the expression patterns of NLP genes in pepper leaves and roots were determined.
Conclusion
These results provide important insights into the multiple functions of CaNLPs in regulating nitrate absorption and transport.
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Acknowledgements
I wish to thank Wei Li for advice on experimental design.
Funding
This study was supported by the following projects: genetic diversity analysis and core germplasm construction of pod pepper germplasm resources in southwest China (Project Approval No. 31760576); Integrated application and demonstration of modern and efficient production technologies of pepper in flat farmland above 500 mu area in Yanhe (Qian Ke He Chengguo [2020] No. 1Z005); Research and demonstration of key technology for standardization planting and optimization selection of special raw materials of sour soup (Qian Ke He Zhicheng [2022] Key No. 010); Platform construction project of Engineering Research Center for Protected Vegetable Crops in Higher Learning Institutions of Guizhou Province (Qian Jiao Ji [2022] No. 040); Advantageous industrial cluster construction project of Guizhou pod pepper supported by Ministry of Agriculture and Rural Affairs/Department of Agriculture and Rural Affairs of Guizhou Province (Nong Can Fa [2020] No. 2/Qian Nong Fa [2020] No. 67).
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WY designed the experiment and wrote the article. SSX and WT analysed the data. PGH and HL performed experiments. LC has made optimizations to the charts. LW helped write this article.
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Wu, Y., Su, Sx., Wang, T. et al. Identification and expression characteristics of NLP (NIN-like protein) gene family in pepper (Capsicum annuum L.). Mol Biol Rep 50, 6655–6668 (2023). https://doi.org/10.1007/s11033-023-08587-y
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DOI: https://doi.org/10.1007/s11033-023-08587-y