Silicon is Deposited in Leaves of New Guinea Impatiens

Fig. 3. Scanning electron micrographs of treated plants (2.0 mM Si added to nutrient solution). Note the “scales” on the serrations of the New Guinea impatiens leaves. The scales are clearly attached, as evidenced by the right side of the right-most scale (A) as well as the top and base of the scale in B. There is a hole in the middle of the lower scale (B), which may be the outline of a hydathode (H). Cells surrounding the scales are wrinkled due to the fresh samples rapidly becoming dehydrated under the vacuum of the SEM, but the scales themselves do not dehydrate, indicating some rigidity, perhaps from Si deposition.



Image from Plant Health Progress article:
Silicon is Deposited in Leaves of New Guinea Impatiens