GSM4183903: SLX_14253_i711_i508; Arabidopsis thaliana; RNA-Seq
Arabidopsis root protoplasts were isolated according to the published protocol (Clark et al., 2018). In short, sterilized seeds were plated onto the nylon mesh (57-103, Nitex) placed on the top of MS agar media. Two rows of seeds comprising approximately 100-150 seeds per row were then grown vertically for 5 days in long-day growth condition. To isolate root protoplasts, ⅓ of the root was cut and chopped on the surface of the mesh and collected in buffer containing cell wall degrading enzymes - 1.5 g Cellulase (C1794, Sigma) and 0.1 g Pectolyase (P3026, Sigma) in 100 ml protoplasting solution. After 1 hour of incubation with occasional stirring, the protoplasts were spun down (200 rcf for 6 min) in 15 ml Falcon tube and after removal of supernatant, cells were resuspended in 700 ul protoplasting solution without enzymes. After filtering with 70 um and 40 um cell strainers sequentially, FACS was performed using 70 micron nozzle at 10 psi. Fluorescence positive cells were collected in a round-bottom polystylene tube that contains 150 - 200 ul RLT buffer with beta-mercaptoethanol (10 ul / 1 ml RLT buffer, RNeasy micro kit protocol, Qiagen). Cell sorting was performed for about 15 min and collected cells were immediately frozen on dry ice and kept in -80 °C for up to one week. For single cell transcriptomics, protoplasts were produced and isolated as described here, but sorted individually into 96-well plates. Libraries were prepared using Illumina Nextera XT DNA preparation kit and either Nextera XT index kit – 96 indexes or Nextera XT index kit v2.