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- W4283711215 abstract "Abstract Tea plant roots can uptake both inorganic nitrogen (NH4+ and NO3−) and organic nitrogen (amino acids) from the soil. These amino acids are subsequently assimilated into theanine and transported to young shoots through the xylem. Our previous study showed that CsLHT1 and CsLHT6 transporters take up amino acids from the soil, and CsAAPs participate in the transport of theanine. However, whether other amino acid transporters are involved in this process remains unknown. In this study, we identified two new CsAAPs homologous to CsAAP7, named CsAAP7.1 and CsAAP7.2. Heterologous expression of CsAAP7.1 and CsAAP7.2 in the yeast mutant 22Δ10α showed that CsAAP7.2 had the capacity to transport theanine and other amino acids, whereas CsAAP7.1 had no transport activity. Transient expression of the CsAAP7.2-GFP fusion protein in tobacco leaf epidermal cells confirmed its localization to the endoplasmic reticulum. Tissue-specific analysis showed that CsAAP7.2 was highly expressed in roots and stems. In addition, CsAAP7.2 overexpression lines were more sensitive to high concentrations of theanine due to the high accumulation of theanine in seedlings. Taken together, these findings suggested that CsAAP7.2 plays an important role in the uptake of amino acids from soil and the long-distance transport of theanine. These results provide valuable tools for nitrogen nutrition studies and enrich our understanding of theanine transport in tea plants." @default.
- W4283711215 created "2022-06-30" @default.
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- W4283711215 date "2022-06-28" @default.
- W4283711215 modified "2023-10-14" @default.
- W4283711215 title "<i>CsAAP7.2</i> is involved in the uptake of amino acids from soil and the long-distance transport of theanine in tea plants (<i>Camellia sinensis</i> L.)" @default.
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- W4283711215 doi "https://doi.org/10.1093/treephys/tpac071" @default.
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