The authors have published a more detailed version of one of the methods used in this study in Bio-protocol:

Niu, X., Chen, M., Tao, A. and Qi, J. (2016). Salinity and Drought Treatment Assays in Kenaf (Hibiscus cannabinus L.). Bio-protocol 6(17): e1918. DOI: 10.21769/BioProtoc.1918.

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