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• W34697095 abstract "Syzygium campanulatum is a perennial indigenous species. It has been widelyplanted in urban areas as hedge plant, topiary and container planting. Thisornamental species requires frequent trimming to maintain its shape due to itsvigorous growth. However, the process of pruning or trimming is costly, timeconsuming and labour intensive. Such a practice may have to be scheduled asfrequent as fortnightly to achieve the mentioned purpose, especially in the casesof maintaining the hedge plants and topiaries.Therefore, this study aims to discover an alternative approach in plantmaintenance. The main objectives of the study are to determine the effects ofplant growth retardants (PGRs) and the optimal dosage for controlling thegrowth of S. campanulatum for container purposes. This study also aims todetermine the effects of PGRs on the appearance of this species after thetreatment. The PGRs used were paclobutrazol and uniconazole. The first studyscreened paclobutrazol at ascending rates i.e. 0 gL-1, 1.25 gL-1, 2.50 gL-1 and 3.75gL-1; and uniconazole at 0 mgL-1, 10 mgL-1, 20 mgL-1, and 30 mgL-1. Theapplication of these PGRs inhibited the vegetative growth, reduced leaf area andincreased the leaf area index significantly. Photosynthetic rate and transpirationrates of the plants treated with 3.75 gL-1 paclobutrazol were significantly reducedto 3.70 3molm-2s-1 and 1.43 mmolm-2s-1 respectively as compared to the controlplants. On the other hand, uniconazole at 30 mgL-1 reduced transpiration rateand stomatal conductance to 1.26 3molm-2s-1 and 0.1 molm-2s-1 respectively ascompared to the control plants. The most effective means for height suppressionwere application of paclobutrazol at 1.25 gL-1 and uniconazole at 10 mgL-1.The second study was carried out to determine the effects of these PGRs on planttissue structure. The leaf and stem specimens of S. campanulatum were viewedunder Scanning Electron Microscope, JSM 5610LV at an acceleration voltage of15 kV. Cross sections of the treated leaf lamina of these PGRs showed that thepalisade and spongy mesophyll cells were closely arranged due to the decreasedleaf size. The palisade cell was found thicker following the treatment. As a result,the thickness of the treated leaf increased. Paclobutrazol at 3.75 gL-1 anduniconazole at 30 mgL-1 increased the palisade parenchyma by 35.17% and37.56% respectively as compared to the control plants. Micrograph images of thestem cross section showed reduction in xylem thickness after the treatment withpaclobutrazol or uniconazole. The xylem thickness were reduced by 48.56% and39.38 after the application of paclobutrazol at 3.75 gL-1 and uniconazole at 30mgL-1 respectively. This condition may affect water and nutrient uptake andultimately slowed the growth of the treated plant.The third study was conducted to assess public preference on the appearance ofthe treated plants. A questionnaire form was designed and used in the survey.Results showed that 93.3% of the respondents agreed that the treated S.campanulatum plants had more attractive appearance and 96.7% of therespondents agreed that the aesthetic value of the treated plants increased.The results of these studies revealed that applications of paclobutrazol anduniconazole were very effective in controlling the growth of S. campanulatum incontainer, and hence extend the trimming cycle. This method can be a betteralternative to overcome landscape maintenance problems such as shortage offunding, time and skilled gardeners." @default.
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• W34697095 date "2006-10-01" @default.
• W34697095 modified "2023-09-24" @default.
• W34697095 title "Effects of Paclobutrazol and Uniconazole on the Growth and Development of Syzygium Campanulatum Korth" @default.
• W34697095 hasPublicationYear "2006" @default.
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