| The number of the chloroplasts in the stomatal guard
cells of Triticum and Aegilops A. MOCHIZUKI and N. SAKURAI Laboratory of Genetics, Hyogo Agricultural College, Sasayama, Japan The number of plastids or chloroplasts were counted in the stomatal guard cells of fourteen species of Triticum, nine species of Aegilops and several hybrids (Tab. 1). The middle portion of the flag leaf of main culm has been taken and about fifty stomata were observed with the aid of the Molisch reaction. The number of the plastids in the stomatal guard cells (abbrev. PNS) seems to be specific to the respective species. PNS is increased with autoploidy but not always with alloploidy (Tab. 2). It is smaller in Emmer group than in the other groups of wheat. It is interesting that the PNS of T. dicoccoides var. spontaneo nigrum and Ae. bicornis is quite different from that of the other species in the same group or section. The hybrids show the intermediate number between or higher than the parents, and the reciprocal cross combinations do not show any difference. Tab. 3 shows the relation between the PNS and combinations of three genomes, A, B and D. This suggests that the PNS of the unknown BB speceies may be smallest. |