Abstract
The salt-tolerant capability of the candidate bioenergy crop prairie cordgrass greatly surpasses that of previously characterized prairie grass species and most other plants. To understand the mechanism of inherited salt tolerance, we compared phenotypic and genetic qualities in half-sib families of prairie cordgrass after salt treatment. Each family was treated with a 400 mM NaCl solution or a water control and then measured for various health phenotypes. Phenotypes associated with salt tolerance were shown to be moderately heritable between parent and offspring. RNA-seq analysis revealed differential regulation in unique pathways including metabolism, signaling, photosynthesis, and the circadian rhythm. The studies herein suggest that alternative regulation of the photosynthetic pathway could confer increased salt resistance in halophytes and can be monitored phenotypically or genetically in breeding programs. The improvement of salt-tolerant traits in prairie cordgrass would increase its potential to be grown as a bioenergy crop on lands that are not suitable for the growth of food crops.
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Acknowledgements
This study was funded by a grant of the NC Sun Grant Initiative to A. Boe and J.L. Gonzalez-Hernandez. M. Robben and E. Thibault were supported by a REU grant from the National Science Foundation (DBI-1263335). A. Boe, Y. Wu and J.L. Gonzalez-Hernandez acknowledge support from the South Dakota Agricultural Experimental Station.
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Experiments were designed by J.G.H., A.B, and Y.W. Salt treatments, plant cultivation, and sample collection were performed in part by M.R., E.T., Y.W., and A.B. RNA was extracted by M.R., E.T., and M.T. RNA-seq analysis and data interpretation was done by M.R. and J.G. H. First draft of the manuscript was prepared by M.R.
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Robben, M., Thibault, E., Tran, M. et al. Transcriptome Analysis of the Heritable Salt Tolerance of Prairie Cordgrass (Spartina pectinata Link). Bioenerg. Res. 11, 106–114 (2018). https://doi.org/10.1007/s12155-017-9881-0
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DOI: https://doi.org/10.1007/s12155-017-9881-0