EFFECTS OF CALCIUM, 6-BENZYLADENINE AND PACLOBUTRAZOL ON INFLORESCENCE QUALITY OF ONCIDIUM

Experiments were conducted in 2007 and 2008 to determine the effect of calcium (Ca), or Ca in combination with 6-benzyladenine (6-BA) or paclobutrazol (PP₃₃₃) on plant growth, flowering, and inflorescence quality of Oncidium ‘Goldiana × Onc.
Guiena Gold’. Treatments comprised: 300 mg/L Ca, 300 mg/L Ca + 50 mg/L 6-BA, 300 mg/L Ca + 100 mg/L 6-BA, 300 mg/L Ca + 100 mg/L PP₃₃₃, and 300 mg/L Ca + 500 mg/L PP₃₃₃. The experiments were arranged in a random block design consisting of 15 pots with flower buds about 1-5 cm in length per treatment.
Days of budding stage, initial flowering and peak flowering were recorded.
The variables were measured at peak flowering time: diameter of basal peduncle, peduncle length, inflorescence length, number of branches and florets.
All the treatments promoted the flowering compared to the control, especially 300 mg/L Ca + 100 mg/L PP₃₃₃ and 300 mg/L Ca + 500 mg/L PP₃₃₃, These treatments advanced days of budding stage, initial and peak flowering in 6.2 d, 6.5 d, 15.0 d and 6.7 d, 6.6 d, 15.2 d, respectively.
As far as inflorescence quality index were concerned, the effect of 300 mg/L Ca + 100 mg/L PP₃₃₃ was better than 300 mg/LCa + 500 mg/L PP₃₃₃. Thus our experiments suggest that 300 mg/L Ca + 100 mg/L PP₃₃₃ was the best to improve Oncidium inflorescence quality.

XXVIII International Horticultural Congress on Science and Horticulture for People (IHC2010): International Symposium on Advances in Ornamentals, Landscape and Urban Horticulture

Xiaorong Liu, Feixiong Liao, Yechun Xu, Biqing Wang

orchid, plant growth regulator, cut flower

https://doi.org/10.17660/ActaHortic.2012.937.76