Until meiosis, plastids in the outer anther wall are proplastids. Afterward, one or two waves of amylogenesis/amylolysis may occur during development.
In most cases, tapetal proplastids undergo division during the early stages of microsporogenesis and next develop into elaioplasts (Dickinson, 1973; Pacini & Juniper, 1979b; Keijzer & Willemse, 1988a; Murgia et al., 1991; Pacini et al., 1992a; Weber, 1992, 1996; Giampolini et al., 1993; Hesse & Hess, 1993; Hess & Hesse, 1994; Clement et al., 1998).
From meiocytes to ripe pollen grain, only proplastids (Fig.
With respect to plastids, ripe pollen grains can be divided into two categories: with amyloplasts and with proplastids. If starch is not present, it does not mean that carbohydrate reserves are absent.