5S Ribosomal RNA Sequence of Pneumocystis carinii and its Phylogenetic Association with "Rhizopoda/Myxomycota/Zygomycota Group"

The cytoplasmic 58 ribosomal RNA sequence from Pneumocystis carinii was determined and compared with those of 382 eukaryotes and an evolutionary tree was constructed to establish the phylogenetic position of Pneumocystis . The data suggest that Pneumocystis is associated with the RhizopodaAlyxomycota/ Zygomycota group but not with common fungi, such as Ascomycota or Basidiomycoia, nor with other protozoa.     

PHOTOINHIBITION OF ELONGATION GROWTH OF ROOTS IN RICE SEEDLINGS

Effects of white, blue, red and far-red lights on the elongationgrowth of intact primary roots in rice seedlings were investigated.White light inhibited elongation of root cells. Blue light inhibitedboth cell elongation and cell multiplication, but red lightinhibited only cell elongation. The effect of far-red lightwas almost the same as that of the red. The lights exerted;the same effects on the growth of primary roots irrespectiveof age of the seedlings. The inhibitory effects of the lightswere also observed when the root of the deshooted seedlingswas irradiated, but not when only the shoot of the seedlingswas irradiated. It was inferred that it is not the shoot butthe root which responds to the light in this phenomenon. DCMUhardly affected root growth at a concentration so high as toinhibit strongly photosynthesis in the shoot. The possibilitythat photosynthesis participates directly in the photoinhibitionof root growth in rice seedlings was excluded. ¹ Present address: Tohoku National Agricultural Experiment Station,Morioka