Chloroplast dimorphism in leaves of Cabomba caroliniana (Cabombaceae)

GALATI, G.B., GOTELLI, M., ROSENFELDT, S., LATTAR. E. C., & TOUR, M.

AQUATIC BOTANY

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2015 p. 46 - 51

0304-3770

Cabomba Aublet is useful a 24 s a genetic model of angiosperm evolution. Previous 25 anatomical studies and preliminary light microscopic observations on C. caroliniana A 26 Gray revealed the presence of dimorphic chloroplasts in both types of leaves, floating 27 and submerged leaves. Leaf anatomy and chloroplasts ultrastructure were analyzed and 28 compared. The chloroplast ultrastructure of the mesophyll and epidermal cells is 29 different. Mesophyll chloroplasts have several plastoglobuli, large starch grains and 30 grana formed by an average of 29 thylakoids. Epidermal chloroplasts are smaller, have 31 grana formed by an average of 9 thylakoids and starch grains are occasional and 32 smaller. A statistical analysis (t-test) was made to determine if differences between 33 chloroplasts are significant. The ultrastructure of the epidermis chloroplast is similar to 34 the one of sun leaves chloroplasts and the ultrastructure of the mesophyll chloroplast is 35 similar to the one of shade chloroplast observed in other species.