Simultaneous deficiency for DDM1 and siRNAs impairs plant growth.

A) Rosette stage plants (21 days-post-germination) of lines deficient for heterochromatic siRNA biogenesis (nrpd1, rdr2 and dcl3) compared to corresponding double mutant combinations with ddm1. Four representative plants in each population (n = 18) were photographed. B) Fresh weight of aerial portion of plants from each population: plants were individually weighed and mean values plotted with standard errors (bars).