Silencing phenotype obtained with pWSRiA:ChlI show a mosaic of leaf bleaching. Tomato plants were agroinfiltrated with pWSRiA:ChlI to silence the sulfur allele of magnesium chelatase, or with pWSRiA:CAT (negative control). Photographs were taken approximately 4 weeks post-infiltration. (a) Plant treated with pWSRiA:ChlI. (b) Leaves of plant treated with pWSRiA:CAT. (c) Leaves of plant treated with pWSRiA:ChlI showing progressive bleaching beginning from the midrib.