earticle

영어

This study observed and compared the anatomical characteristics of compression, lateral, and opposite woods in the stem wood of Pinus merkusii and Agathis loranthifolia. The anatomical characteristics were observed with optical microscopy, scanning electron microscopy, and x-ray diffractometry. Compression wood of both species showed a gradual transition from earlywood to latewood, circular tracheid shape, many intercellular spaces, helical cavities, slit-like bordered pits, and piceoid pit in the cross-field. Helical ribs occurred only in the compression wood of Pinus merkusii. Lateral and opposite woods of Pinus merkusii showed mostly uniseriate bordered pits, pinoid and window-like pit in the cross-field, while those of Agathis loranthifolia mainly showed multiseriate bordered pits and taxodioid and cupressoid pit in the cross-field. In both species, compression wood had the shortest tracheid length, the smallest tracheid diameter, the thickest cell wall, the highest ray number, the smallest pit number per cross-field, the smallest pit diameter, the smallest relative crystallinity, the smallest crystal width, and the largest microfibril angle (MFA) among the parts. Compression wood had the smallest uniseriate and fusiform ray height in Pinus merkusii, while compression wood of Agathis loranthifolia showed the highest uniseriate ray height. Lateral and opposite woods showed a similar ray number, ray height, tracheid length, MFA, and crystalline characteristics in both species. In Pinus merkusii, lateral wood had larger tracheid diameter and thicker cell wall than opposite wood, while lateral and opposite woods had similar pit numbers per cross-field and pit diameter. In Agathis loranthifolia, lateral and opposite wood showed a similar tracheid diameter and cell wall thickness, while lateral wood showed greater pit numbers per cross-field and pit diameter than opposite wood. In conclusion, compression wood showed distinctive anatomical characteristics with lateral and opposite woods in both species, while lateral and opposite wood showed a difference in tracheid diameter, cell wall thickness, and pit number and diameter in the cross-field.