NAA has also been reported to induce
ethylene production in potato tuber tissue (Arteca 1982; Suttle 2003) and may have a mode of action that is similar to 2,4-D. A mixture of
1-naphthaleneacetic acid
(NAA;synthetic auxin) and benzyladenine (cytokinin) was shown to increase tuber size and number when applied to
potatoes as a foliar spray (Ahmed and Sagar 1981).