Abstract
Alkaligrass (Puccinellia tenuiflora) is a monocotyledonous halophyte pasture, which has strong tolerance to saline-alkali, drought, and chilling stresses. We have reported a high-quality chromosome-level genome and stress-responsive proteomic results in P. tenuiflora. However, the gene/protein function investigations are still lacking, due to the absent of genetic transformation system in P. tenuiflora. In this study, we established a higher efficient Agrobacterium-mediated transformation for P. tenuiflora using calluses induced from seeds. Agrobacterium strain EHA105 harbors pANIC 6B vectors that contain GUS reporter gene and Hyg gene for screening. Ten mg·L−1 hygromycin was used for selecting transgenic calluses. The optimized condition of vacuum for 10 min, ultrasonication for 10 min, and then vacuum for 10 min was used for improvement of conversion efficiency. Besides, 300 mg·L−1 timentin was the optimum antibiotics in transformation. PCR amplification exhibited that GUS gene has been successfully integrated into the chromosome of P. tenuiflora. Histochemical GUS staining and qRT-PCR analysis indicated that GUS gene has stably expressed with ß-glucuronidase activity in transgene seedlings. All these demonstrated that we have successfully established an Agrobacterium-mediated transformation system of P. tenuiflora, which provides a good platform for further gene function analysis and lays a solid foundation for molecular breeding.
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Funding
This study was supported by the National Natural Science Foundation of China (No. 32070300), the Fund of Central Government Guides Local Science and Technology Development, China (No. YDZX20203100003927), and the Fund of Shanghai Engineering Research Center of Plant Germplasm Resources, China (No.17DZ2252700) to S. D.
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Project design: SJ. D., Z. Q., MH. S., and CX. F.; experimental work, Y. Z., CX. Q., SJ. L., and YY. S.; data analysis, Y. X., YX. Z., MH. S., Z. Q., and Y. L.; writing manuscript, Y. Z., Z. Q., CX. F., and SJ. D. All authors read and approved the manuscript.
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Zhang, Y., Qin, C., Liu, S. et al. Establishment of an efficient Agrobacterium-mediated genetic transformation system in halophyte Puccinellia tenuiflora. Mol Breeding 41, 55 (2021). https://doi.org/10.1007/s11032-021-01247-8
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DOI: https://doi.org/10.1007/s11032-021-01247-8