Effects of sucrose and mannitol on in vitro slow growth of Dendrobium cretaceum Lindl.
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Abstract
This study investigated the in vitro growth retardation of Dendrobium cretaceum Lindl. by adding different concentrations of sucrose and mannitol (0, 2, 4, 6, 8, and 10%) to a Modified Vacin and Went (1949) medium. The experiment was arranged in a Completely Randomized Design (CRD) with six treatments and ten replications. After 24 weeks of culture, the results showed that the medium supplemented with 10% sucrose resulted in the lowest average pseudobulb height (1.51 cm). There were no statistically significant
differences among the sucrose treatments in terms of average pseudobulb diameter (0.23 to 0.25 cm) and the average number of leaves (4.05 to 4.75 leaves). For the mannitol treatments, supplementation with 8% and 10% mannitol produced the lowest average pseudobulb heights (0.79 and 0.72 cm, respectively); however, these concentrations also caused yellowing of leaves and pseudobulbs. While different mannitol concentrations had no significant effect on the average pseudobulb diameter (0.22 to 0.25 cm), they did result in statistically significant differences in the average number of leaves (3.45 to 4.90 leaves). Therefore, using 10% sucrose was more effective than using mannitol for the in vitro growth retardation of Dendrobium cretaceum Lindl.
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References
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