“…There is evidence that the enzyme in developing rice endosperm is plastidial (Nakamura et al, 1996a), and both plastidial and extraplastidial activities have been found in leaves (Okita et al, 1979;Li et al, 1992;Ghiena et al, 1993), but the location of the activity and the number of different gene products involved in other organs are not known. Isoamylase activity has been reported only from maize endosperm, in which it is plastidial (Doehlert and Knutson, 1991;Yu et al, 1998), and potato tuber, in which its intracellular location is not known (Ishizaki et al, 1983). This apparently limited distribution probably reflects the lack of research on other organs.…”