Cyanazine metabolism

Beynon et al. (1972a) compared the breakdown of cyanazine, atrazine, and simazine in soils and com. Residues of parent compound in leaf and stem tissue of corn plants 70 days after application at a rate of 1.5 kg a.i./ha to a medium loam soil were barely detectable. Cyanazine metabolized to chlorotriazines and hydroxytriazines, including their dealkylated derivatives. Atrazine and simazine metabolized to hydroxytriazines and unidentified polar components. 

Kern, A.D., W.F. Meggitt, and D. Penner (1976). Cyanazine metabolism in corn, fall panicum, and green foxtail. Weed Res., 16 119-124. 

The triazine herbicides can be divided into four different structural classes chlorotriazines, methylthiotriazines, methoxytriazines, and atypical or asymmetrical triazines. The chlorotriazine group includes atrazine, simazine, pro-pazine, terbuthylazine, and cyanazine. The methylthiotriazine group includes ametryn, prometryn, and terbutryn. The methoxytriazine group will include prometon and secbumeton. Hexazinone and metribuzin were chosen to represent the atypical triazine group. The plant metabolism of the most researched member of each triazine group will be discussed in detail to cover all major biological and chemical transformations reported in the literature. 

Cyanazine is different from the other chloro-.v-triazines already discussed in that it has a labile cyano group as part of the alkylamino substituent. A series of papers were published in 1972 describing the metabolism of cyanazine in corn (Beynon et al, 1972a, 1972b), wheat, and potato (Beynon et al, 1972c). 

The metabolism of cyanazine in plants has been investigated in Wright s soils by Osgerby (Chapman et al., 1968). The metabolism proceeds in maize and soil according to the following scheme (Beynon, 1972 Wright, 1970) ... 

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