PlumX Metrics
Embed PlumX Metrics

The distribution of adenosine triphosphatase activity in differentiating and mature phloem cells of Nicotiana tabacum and its relationship to phloem transport

Journal of Ultrastructure Research, ISSN: 0022-5320, Vol: 44, Issue: 5, Page: 388-404
1973
  • 39
    Citations
  • 0
    Usage
  • 5
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

Article Description

A cytochemical study has been made of the distribution of ATPase activity during the differentiation of phloem cells in Nicotiana tabacum. At early stages of differentiation, P-protein bodies consisting of compact aggregates of P-protein tubules are formed in the sieve elements. Cells at this stage of development show ATPase activity at their surfaces, in mitochondria, and in dictysomes; however, there is no evidence of activity associated with the P-protein bodies. At intermediate stages of sieve element differentiation, when the P-protein tubules begin to disperse in the cell lumen, reaction product indicating ATPase activity is observed associated with the P-protein. Activity is also found during this stage at the cell surfaces, in the mitochondria, dictyosomes, and plasmodesmata. In mature sieve elements, ATPase activity is associated with the dispersed P-proteins, at the cell surfaces, sieve-element reticulum, and in mitochondria. ATPase activity is demonstrated in companion cells and parenchyma cells at all stages at the surfaces, and in mitochondria and plasmodesmata.

Provide Feedback

Have ideas for a new metric? Would you like to see something else here?Let us know