Intracellular particle motions (cytoplasmic streaming) in staminal hairs of Setcreasea purpurea: Effect of azide and low temperature

Abstract

(€. B. T., N. S.A.)Cytoplasmic streaming and its response to azide and low temperature were examined by using high-resolution video-enhanced light microscopy in Setcreasea pulpurea staminal hair cells of immature flowers. Particles and organelles examined moved along well-defined pathways, in repeated and unequal saltatory steps, at different rates and sometimes against the main direction of flow (bidirectionally) in both transvacuolar strand and peripheral cytoplasm. Particle movements were reversibly inhibited with azide. Low temperatures caused transvacuolar strands to shift or break. This cytoplasm accumulated in areas outside of the vacuole where spherosomes continued to saltate, but not along well-defined pathways. In the peripheral cytoplasm, however, the spherosomes continued to move normally, amyloplasts became swollen, and they plus the other organelles (except spherosomes) were stationary. Normal particle movements were obtained when chilled cells were rewarmed to 27°C for ca 15 min.