“…Other genes, like HHD2, regulate root hair elongation through the regulation of various cellular components. Such genes include COW1, MYA2, RHD2, EXPA7, RHS2, RSL2, and ACTIN2 (Cho and Cosgrove, 2002;Ringli et al, 2002;Foreman et al, 2003;Böhme et al, 2004;Peremyslov et al, 2008;Won et al, 2009;Yi et al, 2010). For example, a widely characterized cellular component involved in root hair elongation is ROS, which is produced by NADPH activity.…”