Phloem Necrosis of Elms: Etiological, Physiological and Cytological Studies |
Common terms and phrases
affected American elm appearance associated became bodies brooms buffer callose deposition caused cell companion cells contained Control Cross section culture cytoplasm dense density diameter differences differentiation discoloration diseased distribution electron elm seedlings examined experiment exposure fixed foliage fracture faces freeze-etch graft healthy host immature indicate infected inoculated intracellular lateral leaf leaves lumen material mature membrane metaphloem sieve elements microscopy midrib mycoplasma populations mycoplasmas nodes observed occurred organisms P-protein parenchyma cells parietal particles parvifolia pear period periwinkle phloem necrosis plant pathogenic plants plastids PN agent PN-diseased pores position prepared present prior produced radioactivity range recently reported RESULTS roots rosea rubra Samples secondary phloem seen shape shoots showed sieve plate sieve tube similar Sinclair spiroplasma stages starch stem structure stunted symptom development symptomatic symptoms thin sections tissue translocation transmitted transport treated treatment trees ultrastructure usually vacuoles variable vectors vesicles virus walls yellows