Morphological and Physiological Responses of Torch Ginger [Etlingera elatior (Jack) R.M. Smith] to Paclobutrazol Application
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Abstract
The effects of paclobutrazol (PBZ) on morphological and physiological responses of torch ginger was investigated. After drenching once stem height, leaf size, guard cell density, guard cell size and number of chloroplast were recorded for various periods of time. At the first month after PBZ treatment all concentrations gave significant different in stem height. The maximum height of torch ginger at 23.70 cm was obtained from control treatment without PBZ. Increaseing in concentrations of PBZ caused the decrement in stem height. At the second month after drenching the decrement in stem height was clearly observed. Treated-plants with high concentrations of PBZ (200, 300 and 400 mg.L-1) had markedly slowed well in growth. The highest concentration of PBZ at 400 mg.L-1 gave the lowest height of torch ginger at 17.65 cm. Guard cell density was not significantly different between PBZ-treated and non treated-plants but non treated-plants gave higher density than those from treated-plants. For guard cell size PBZ at concentration of 400 mg.L-1 gave the highest width and length at 29.81 and 54.95 μm, respectively. This concentration of PBZ gave the highest number of chloroplasts at 31.67 cells as well.
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