The effect of growth regulators gibberellic acid (Pro-Gibb), daminozide (B-Nine), ancymidol (A-Rest) and paclobutrazol (Bonzi) were evaluated on species of Clerodendrum grown as flowering pot plants. Studies on photoperiod and post-production longevity were also included. Experiments were conducted on C. bungei, C. thomsoniae, C. ugandense, C. phillippinum, C. paniculata and C. speciosissimum in polycarbonate greenhouses.
For C. thomsoniae the best growth control was achieved by applying paclobutrazol and ancymidol drench at a rate of 1.0 mg a.i. /pot. For C. ugandense, the most appropriate application rate of PGR was paclobutrazol drench at 5 to 15 mg a.i./pot. C. bungei did not respond significantly to either daminozide or paclobutrazol treatments compared to control.
Based on the visual quality rating, C. bungei were acceptable as marketable plants until day 7, and C. ugandense were acceptable as marketable plants until day 5. Neither daminozide nor paclobutrazol had any effect on C. bungei quality ratings in post-production. In C. ugandense, however, there were significant differences in post-production when comparing the daminozide and the paclobutrazol treatments. On day 5, 7 and 11, the paclobutrazol treated plants had significantly lower quality ratings compared to control and compared to those treated with daminozide. It appears that the paclobutrazol treatment may produce a quality plant, but has a negative effect on post-production longevity.
Gibberellic acid at 10 ppm was considered the best rate and most economical rate for promoting optimum vegetative growth of C. thomsoniae to sufficiently cover a round support hoop.
C. speciosissimum, C. phillippinum, C. paniculata and C. speciosissimum were determined to be long day plants (12-h photoperiod or longer). Height of C. paniculata and C. speciosissimum was significantly increased by the 12 or 16-h photoperiod.
| Identifer | oai:union.ndltd.org:LSU/oai:etd.lsu.edu:etd-04122005-112516 |
| Date | 13 April 2005 |
| Creators | Delaune, Annina |
| Contributors | Edward W. Bush, Charles E. Johnson, Jeff S. Kuehny |
| Publisher | LSU |
| Source Sets | Louisiana State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lsu.edu/docs/available/etd-04122005-112516/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached herein a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, 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 LSU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below and in appropriate University policies, 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. |
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