Title page for ETD etd-04122005-112516

Type of Document

Master's Thesis

Author

Delaune, Annina

URN

etd-04122005-112516

Title

Aspects of Production for Clerodendrum as Potted Flowering Plants

Degree

Master of Science (M.S.)

Department

Horticulture

Advisory Committee

Advisor Name	Title
Jeff S. Kuehny	Committee Chair
Charles E. Johnson	Committee Member
Edward W. Bush	Committee Member

Keywords

c. bungei
c. ugandense
c. quaduloculare
clerodendrum thomsoniae
paclobutrazol (bonzi™)
ancymidol (a-rest™)
daminozide (b-nine™)
gibberellic acid (pro-gibb™)
c. speciosissimum and c. paniculata
photoperiod
growth retardants
c. phillippinum

Date of Defense

2005-03-22

Availability

unrestricted

Abstract

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.

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