Epicuticular wax forms on leaf surfaces of Zizania aquatica

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Abstract
The epicuticular wax forms on the leaves of the three varieties of Zizania aquatica L. were determined from control plants in the field and greenhouse, and served as a reference for interpreting changes in the wax forms of plants grown under different experimental conditions. Short stubby wax rodlets first appeared 15 cm below the water's surface on the portion of the adaxial surface of young leaves which eventually became floating (leaf numbers 4 to 6). Wax rodlets and platelets were present on both surfaces of the aerial leaves (leaf numbers 7 to 12). The relationship between wax appearance and leaf numbers could be varied by manipulating the water level; for as long as water surrounded the permanently submersed leaves or the submerged portions of the floating leaves, wax production was inhibited. Growth under continuous light and constant temperature conditions indicated that factors other than the day–night cycle were responsible for wax ultrastructure.

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