Zea mays

2.35
2.37
2.35 Dividing chloroplasTS from mesophyll rissue in
Linum usitatss;mu/Il (flax). One plastid has. a median
isthmus (arrows) which indicates the prospecrive plane of
division, while the Olher rwo pbslids have jusl separated.
(G-Os. TI.\1 x 7,500.)
2.37 Proplastids from de-differentiaring cotylcdon:lry
tissue of Phaseoills vlligaris (bean}. Few membranes are
evident in the stroma but the numerous small starch grains
(I) clearly define these as plaslids. (C-Os, TEM x 7,OOO.}
44
I Starch groins
I Granal membranes
2 Fret S)'SI