| dc.contributor |
Dr. Paul V. Nelson, Committee Member |
|
| dc.contributor |
Dr. Randy Wells, Committee Member |
|
| dc.contributor |
Dr. Brian E. Whipker, Committee Chair |
|
| dc.contributor |
Dr. John D. Williamson, Committee Member |
|
| dc.creator |
Krug, Brian Alan |
|
| dc.date |
2010-04-02T19:11:42Z |
|
| dc.date |
2010-04-02T19:11:42Z |
|
| dc.date |
2008-01-02 |
|
| dc.date.accessioned |
2023-02-28T17:08:45Z |
|
| dc.date.available |
2023-02-28T17:08:45Z |
|
| dc.identifier |
etd-12072007-142004 |
|
| dc.identifier |
http://www.lib.ncsu.edu/resolver/1840.16/5326 |
|
| dc.identifier.uri |
http://localhost:8080/xmlui/handle/CUHPOERS/265744 |
|
| dc.description |
The overall objectives of these studies were to characterize and determine the causes of abnormal growth observed in pansy (Viola x wittrockiana), petunia (Petunia x hybrida), and gerbera (Gerbera jamesonii) plug production. Observed symptoms included distorted, curled and thickened leaves, abortion of apical meristems and proliferation of lateral shoots. Symptoms have been attributed to a calcium (Ca) or boron (B) deficiency. Calcium and B deficiencies were induced; plants deficient in Ca became discolored and eventually necrotic, while symptoms on plants deficient in B were similar to those observed in plug production.
It is improbable that insufficient B is the cause of B deficiency; growers use complete liquid fertilizer at every irrigation. High substrate pH causes B in the substrate to be unavailable to the plant. When germination substrate was incorporated with four increasing rates of dolomitic limestone, substrate pH increased and the shoot tissue concentration of B decreased. Plants take up B passively through the transpiration stream; therefore B uptake is linked to the rate of transpiration. Plants were exposed to 3 degrees of drought stress either by drying the substrate or the use of polyethylene glycol. Shoot concentrations of B were not effected by either drought stress treatment. Abscisic acid was applied as a foliar spray or substrate drench, each at 2 different concentrations, to decrease transpiration. Abscisic acid resulted in a decrease of both transpiration and shoot B concentration.
High relative humidity (RH ) can also decrease plant transpiration; plug production requires elevated levels of RH to ensure germination and to maintain hydration of young seedlings. Plants were grown in ambient or high RH; plants grown in high RH had lower shoot tissue concentrations of B. To attempt to counteract the effect of high RH, air flow was increased on a constant basis. Providing constant airflow did not increase transpiration or shoot tissue concentration of B. |
|
| dc.rights |
I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dis
sertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.
I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I
retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
|
| dc.subject |
Hoagland's |
|
| dc.subject |
Hydroponics |
|
| dc.subject |
Nutrient deficiency |
|
| dc.title |
Physiological and Environmental Factors Affecting Shoot Tissue Boron Concentration of Pansy (Viola x wittrockiana), Petunia (Petunia x hybrida), and Gerbera (Gerbera jamesonii) Plugs. |
|