Journal of Oil Palm Research Vol. 28  December 2016 p.  404-414
IMPACT OF PACLOBUTRAZOL ON THE GROWTH AND DEVELOPMENT OF NURSERY GROWN CLONAL OIL PALM (Elaeis guineensis Jacq.)

Author(s): MOHD NASRIQ HAFIZEE ABDUL RAHMAN*; NOOR AZMI SHAHARUDDIN**; NURNIWALIS ABDUL WAHAB*; PUTERI EDAROYATI MEGAT WAHAB‡; MEILINA ONG ABDULLAH*; NUR ASHIKIN PSYQUAY ABDULLAH‡; GHULAM KADIR AHMAD PARVEEZ*; JEREMY A ROBERTS‡‡ and ZUBAIDAH RAMLI*

The eco­nomic life of an oil palm (Elaeis guineen­sis Jacq.) plant is asso­ci­ated with the stature of the palm as the height of each oil palm affects the cost of har­vest­ing. Shorter palm allows ease of har­vest­ing and bet­ter fruit recov­ery hence con­tributes to the increase of the fresh fruit bunch (FFB) yield. This study was con­ducted to inves­ti­gate the effect of paclobu­tra­zol (PBZ), an inhibitor of gib­berellin (GA) biosyn­the­sis, on the growth and devel­op­ment of clonal oil palms main­tained under nurs­ery con­di­tions. Appli­ca­tion of PBZ sig­nif­i­cantly reduced the growth of clonal palms with the opti­mal con­cen­tra­tion of PBZ being 50 mg litre-1 when applied as a foliar spray. PBZ-treated palms exhib­ited shorter fronds that were dark green in colour and plants had a more com­pact struc­ture as com­pared to untreated con­trols. Lon­gi­tu­di­nal sec­tions of PBZ-treated oil palm clones revealed that both leaves and stems com­prised of fewer cells each with a smaller vol­ume. PBZ-treated plants exhib­ited a higher rate of pho­to­syn­the­sis com­pared to con­trols and this was cor­re­lated with an accu­mu­la­tion of starch in stem cells. These results pro­vide evi­dence that the veg­e­ta­tive growth of oil palm is reg­u­lated by GA lev­els and that by manip­u­lat­ing the con­cen­tra­tion of these hor­mones it may be pos­si­ble to atten­u­ate the oil palm height and ulti­mately increase productivity.

Keywords: , , , , ,

Author Information
* Malaysian Palm Oil Board, 6 Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia. E-mail:


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