Nature of calcium uptake by plants Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/dz010s41g

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Cucumber, pea, bean, and corn excised roots were used to assess species differences in metabolic uptake of calcium It was found that Ca was mostly taken up by these root systems by non-metabolic processes. The apparent free space ranged from 26 to 28 percent of the total root volume and beyond that no large accumulation of Ca was observed. Although a small rate of increase was observed during the 12 hour experimental period, this was attributed to either an increase in the total non-metabolic component or to a manifestation of the small percentage of younger vacuolated segments of the roots. These results pointed out that the physiological maturity of the roots may be the controlling factor in Ca absorption and that mature root cells are relatively impermeable to Ca. Excised roots and intact plants of six-week-old tomato were compared to evaluate the influence of the top in the uptake of calcium. On a per unit of root basis, the uptake of calcium was 5.5 times faster for intact plants than for the most rapid sustained phase of absorption for excised roots. Intact plants absorbed calcium almost 39 times faster than the slower rate observed for the excised roots. Several hypotheses were advanced to explain these observations, Mass flow in the transpirational stream or migration along charged surfaces would represent non-metabolic processes. Another possibility is an indirect enhancement of metabolic uptake by transpiration due to a stimulation of bleeding in the root. A third possibility is the operation of a uni-directional transport of ions across the endodermis in intact plants which goes undetected in excised root systems because the stele is opened to the external solution.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 5.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2014-06-17T17:49:42Z (GMT) No. of bitstreams: 1 SilvaNorambuenaBernardo1963.pdf: 1881834 bytes, checksum: 2c366b4a1bd579e20bfd3015eff5f545 (MD5)
  • description.provenance : Made available in DSpace on 2014-06-17T21:38:54Z (GMT). No. of bitstreams: 1 SilvaNorambuenaBernardo1963.pdf: 1881834 bytes, checksum: 2c366b4a1bd579e20bfd3015eff5f545 (MD5) Previous issue date: 1962-11-06
  • description.provenance : Approved for entry into archive by Katy Davis(kdscannerosu@gmail.com) on 2014-06-17T21:38:54Z (GMT) No. of bitstreams: 1 SilvaNorambuenaBernardo1963.pdf: 1881834 bytes, checksum: 2c366b4a1bd579e20bfd3015eff5f545 (MD5)
  • description.provenance : Rejected by Patricia Black(patricia.black@oregonstate.edu), reason: Replace on 2014-06-17T17:42:25Z (GMT)
  • description.provenance : Submitted by Georgeann Booth (gbscannerosu@gmail.com) on 2014-06-17T17:45:40Z No. of bitstreams: 1 SilvaNorambuenaBernardo1963.pdf: 1881834 bytes, checksum: 2c366b4a1bd579e20bfd3015eff5f545 (MD5)
  • description.provenance : Submitted by Georgeann Booth (gbscannerosu@gmail.com) on 2014-06-07T00:20:48Z No. of bitstreams: 1 NorambuenaBernardo1963.pdf: 1528542 bytes, checksum: 1efb2775e185ebb51d9efff3b7d87cda (MD5)

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items