The study of submicrostructure on leave-back in 9 species of rice

The submicro-characters on the leave-back of 9 Oryza species, O.australiensis,O.granulata, O.punctata, O.officinalis, O.latifolia, O.barthii, O.glaberrima, O.rufipogon, and O.sativa were studied with the Scanning Electric Microscope (SEM). The leave-back consisted of 3 vertically linked subunits, silica-phellem block, stomate block, and large-tubercle block were observed. The O.rufipogon, O.sativa, O.barthii, and O.glaberrima have a papicle on the phellem cell (Figl: 6,7,8,9,10), which is absent in the other 5 species (Fig1:1,2,3,4,5). The stomatic block has 1-3 rows storeates and some papicles around the stomate. On O.rufipogon and O.sativa more than 4 large papicles are obviously observed around the stomate (Fig2: 8,9,10). On O.granulate and O.punctata there are 4 small papicles on the stomate which located at both poles of the stom