• Journal of Forest and Environmental Science
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• 제25권2호
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• pp.119-126
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• 2009

An efficient in vitro plant regeneration system was developed through shoot proliferation from axillary buds of Tectona grandis (L.f), APNBV-1 (Andhra Pradesh North Badrachalam Venkatapuram-1) clone. Multiple shoots of high quality were produced in vitro from axillary bud explants. An average of 4.39 shoots/explant were obtained on Murashige and Skoog's (MS) medium supplemented with plant growth regulators (PGRs) benzyl amino purine (BA), kinetin (KN), indole acetic acid (IAA), gibberillic acid ($GA_3$), growth adjuvants casein hydrolysate (CH), adenine sulphate (Ads) and antioxidants ascorbic acid, polyvinyl pyrrollidine (PVP). Eighty five percent of rooting was observed in ex vitro rooting media containing IBA and vermiculite. In ex vitro rooting, single shoots with 2 to 3 nodes were subjected to IBA of different concentrations at different periods of time intervals. Direct rooting in vermiculite at 500 ppm concentration of IBA resulted in 4.3 number of roots with 2 cm length. Minimum response of rooting and length of roots were recorded at 100 ppm concentration of IBA. Planlets were transferred to plastic bags for short acclimatization stage in green house where they survived at 95%.

• Journal of Plant Biotechnology
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• 제46권4호
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• pp.291-296
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• 2019

본 연구는 티크의 기내 생장 및 발근에 미치는 light-emitting diode (LED) 효과를 구명하기 위해 수행되었다. 티크의 정아 절편체의 줄기 신장은 LED 혼합광(BR, 50% 청색광 + 50% 적색광) 하에서 DKW 배지 배양 시 3.2 cm로 가장 좋았고, 줄기유도는 광원 및 배지(MS 및 DKW) 효과가 그리 크지 않은 것으로 나타났다. BA 농도 처리 시 최대 줄기 유도는 BR 광원 및 1.0 mg/L 처리구에서 2.4개, 최대 줄기 신장은 BR 및 0.5 mg/L 처리구에서 4.94 cm로 가장 효과적이었다. 발근에 영향하는 IBA 농도 효과는 정아 절편체를 BR 및 0.5 mg/L 처리구에서 배양 시 최대 발근율(93.8%)과 최대 뿌리 길이 신장(1.3 cm)을 보였고, 뿌리 수는 0.2 mg/L (3.1개/절편) 처리구에서 가장 좋은 것으로 나타났다. 발근 식물체는 상토로 이식 후 순화 과정을 거쳐 정상적은 생장을 보였다.

• 한국제4기학회지
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• 제21권1호
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• pp.15-26
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• 2007

A wide tree-ring data network from Western Himalayan region as well as from Central and Peninsular India have been established by the Indian Institute of Tropical Meteorology (IITM), Pune, India. This includes several ring width and density chronologies of Himalayan conifers (Pinus, Picea, Cedrus, Abies)covering entire area of Western Himalaya and teak (Tectona grandis L.F.) from central and peninsular India. Many of these chronologies go back to $15^{th}$ century. Tree-ring based reconstructed pre-monsoon (March-April-May) summer climate of Western Himalaya do not show any significant increasing or decreasing trend since past several centuries. High altitude tree-ring chronologies near tree line-glacier boundary are sensitive to the winter temperature. Unprecedented higher growth in recent decades is closely associated with the warming trend over the Himalayan region. Dendroclimatic analysis of teak (Tectona grandis) from Central and Peninsular India show significant relationship with pre-monsoon and monsoon climate. Moisture index over the region indicates strong association with tree-ring variations rather than the direct influence of rainfall. It is evident that, two to three consecutive good monsoon years are capable of maintaining normal or above normal tree growth, even though the following year is low precipitation year.

• Journal of the Korean Wood Science and Technology
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• 제45권4호
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• pp.463-470
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• 2017

The objectives of this study are to obtain the basic knowledge of anatomical characteristics and wood properties of thinning trees of young teak (Tectona grandis L.F.) for fulfill the timber demand in Indonesia. Nine thinning trees of 5-year-old teak clone trees were used for analyzing the cell morphology and air-dry density. Vessel diameters in pore and outer pore zones were 165 and $90{\mu}m$, respectively. Mean value of fiber diameter, cell wall thickness, and fiber length in outer pore zone were $14.6{\mu}m$, $2.07{\mu}m$, and 1.04 mm, respectively. In addition, mean value of air-dry density was $0.55g/cm^3$. The measurement and values of vessel diameter, fiber diameter, cell wall thickness, fiber length and air-dry density in the experimental had lower than those in the older teak. Therefore, it could be suggested that the wood from thinning young teaks was not appropriate as construction material, but it could be used for furniture which do not need high of strength properties. Furthermore, since the measurements values of anatomical characteristics were still increasing from pith to bark, it could be suggested that 5-year-old teak clones are still in a juvenile phase. Positively significant correlations were found between air-dry density and cell wall thickness, indicating that cell wall thickness is strongly correlated with wood density of teak.