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        Radial variation of bending property in plantation grown Acacia auriculiformis in Bangladesh

        Md. Qumruzzaman Chowdhury,Nobuo Yoshizawa,Futoshi Ishiguri,Tokiko Hiraiwa,Yuya Takashima,Kazuya Iizuka,Shinso Yokota 한국산림과학회 2012 Forest Science And Technology Vol.8 No.3

        Acacia auriculiformis is one of the major fast-growing plantation species in Bangladesh. Understanding the radial variation of bending property has importance in tree improvement and wood utilization. In this study, the radial variation of modulus of elasticity (MOE) and modulus of rupture (MOR) in static bending were examined in 11-year-old plantation-grown Acacia auriculiformis from Bangladesh. MOE and MOR increased up to about 6 and 8 cm radial distance from the pith, respectively, and then both properties were nearly stable toward the bark. MOE did not show significant correlation with air-dried density. Conversely, MOR showed significant correlation with airdried density. Significant variation among the trees indicates that the air-dried density and MOR could be used in plus tree selection for wood quality improvement of this species through tree breeding.

      • KCI등재후보

        In vitro plantlet regeneration of ‘‘dwarf’’ Indian olive (Elaeocarpus robustus Roxb.): a fruit plant of Bangladesh

        Md. Mahabubur Rahman,Muhammad Nurul Amin,Futoshi Ishiguri,Shinso Yokota,Rubaiyat Sharmin Sultana,Yuya Takashima,Kazuya Iizuka,Nobuo Yoshizawa 한국식물생명공학회 2009 Plant biotechnology reports Vol.3 No.3

        A plantlet regeneration protocol was developed on pot-grown mature plants of Elaeocarpus robustus Roxb. cv. Dwarf from nodal and leaf explants. The best yield of adventitious shoots was achieved from the leaf-derived calli in a modified MS (MMS1, half strength of major salts, full strength of minor salts, and vitamins) medium containing 4.0 lM BA ? 4.0 lM Kn ? 0.5 lM NAA ? 15% coconut water (CW). The shoot multiplication rate was amplified about twofold per culture after the addition of 15% CW to the medium. The rate of shoot multiplication reached maximum at the 5th subculture, and it maintained this rate throughout the 3 subsequent subcultures. The best rooting in vitro was investigated by subculturing the microcuttings in an MMS2 (half strength of both major salts and minor salts and full strength of vitamins) medium containing 1.0 lM IBA in the dark for one initial week at 30C, followed by subculturing them in a plant-growth regulator (PGR)-free medium in the light. The plantlets raised in vitro were successfully established under ex vitro conditions. A plantlet regeneration protocol was developed on pot-grown mature plants of Elaeocarpus robustus Roxb. cv. Dwarf from nodal and leaf explants. The best yield of adventitious shoots was achieved from the leaf-derived calli in a modified MS (MMS1, half strength of major salts, full strength of minor salts, and vitamins) medium containing 4.0 lM BA ? 4.0 lM Kn ? 0.5 lM NAA ? 15% coconut water (CW). The shoot multiplication rate was amplified about twofold per culture after the addition of 15% CW to the medium. The rate of shoot multiplication reached maximum at the 5th subculture, and it maintained this rate throughout the 3 subsequent subcultures. The best rooting in vitro was investigated by subculturing the microcuttings in an MMS2 (half strength of both major salts and minor salts and full strength of vitamins) medium containing 1.0 lM IBA in the dark for one initial week at 30C, followed by subculturing them in a plant-growth regulator (PGR)-free medium in the light. The plantlets raised in vitro were successfully established under ex vitro conditions.

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