Larix leptolepis

Several flavonoids were isolated from either the wood of the Japanese larch Larix leptolepis (Pinaceae) or from the wood of Prunus species.152 In total, 14 flavonoids were tested for antifeedant activity against C. formosanus. Although all flavonoids did exhibit antifeeding behavior, there were large variations. Three compounds,... 

Fig. 4.2.3. A UV photomicrogrpah of thickened secondary wall of Larix leptolepis sclerenchyma cell. (Imagawa 1981)...

Small wood chips are employed in UV microscopic measurements. If partially delignified wood is to be studied, care must be taken to conduct the delignifica-tion in such a manner that the fibers are not dispersed before the specimen is embedded. In the quantitative analysis of lignin, the wood chips should be solvent-extracted to remove extraneous materials. For Larix leptolepis, Imagawa and Fukazawa (1978) recommend sequential extraction with n-hexane at room temperature for 5 days, alcohol-benzene (1 2, v/v) in a Soxhlet extractor for 48 h, and acetone-water (1 1, v/v) at room temperature for 4 days. 

Imagawa H (1981) Study on the seasonal development of the secondary phloem in Larix leptolepis. Res Bull Coll Exp For Hokkaido Univ 38 31-44 Imagawa H, Fukazawa K (1978) Influence of wood extractives on UV microscopy for lignin determination. Mokuzai Gakkaishi 24 583-586... 

Larix leptolepis Gordon/Karamatsu Larix leptolepis Gordon/Karamatsu Picea abies (L.) Karst./Doitsutohi Picea glehnii Masters/Akaezomatsu Picea glehnii Masters/Akaezomatsu Picea hondoensis Mayr./Tohi Picea jezoensis Carr./Ezomatsu Picea jezoensis Carr./Ezomatsu... 

Flavonoid compounds are common in other softwoods. Both Douglas fir and western larch contain the dihydroquercetin (Gardner and Barton, 1960), the distribution of this constituent being rather variable within the tree, but is highest at the heartwood-sapwood boundary. In studies on New Zealand grown Larix decidua and Larix leptolepis (Uprichard, 1963) it was shown that, in the 45 yr-old trees examined, the flavonoid polyphenols (dihydroquercetin and dihydrokaempferol) inereased steadily from the centre of the tree to the heartwood-sapwood boundary after whieh polyphenols dropped to neglible amounts. 

Larix leptolepis (Japanese larch) tritylated arabinogalactan 751... 

Occurs in Larix leptolepis and Taxus baccata and other seed oils. 

Kim, Y.W., Youn, Y., Noh, E.R., and Kim, J.C. (1999) Somatic embryogenesis and plant regeneration from immature zygotic embryos of Japanese larch Larix leptolepis). Plant Cell Tiss. Org. Cult., 55 95-101. 

Propiovanillone has been identified in Quercus rubra wood (152) and some phenylglycerol compounds are also found in various woody species. Thus, guaiacylglycerol (33) has been found in the sapwood of western hemlock (11) and the heartwood of Pinus resinosa (142). Further, the 1-O-glucoside and the 1-0-and 3-O-glucosides of p-hydroxyphenylglycerol have been reported from the inner bark of Larix leptolepis (105) and Picea glehnii (145), respectively, and an iso-prene derivative of the 3-(4-hydroxyphenyl)-propan-l-ol has been isolated from wood and bark of Zanthoxylum cuspidatum (86). 

Miki K, Sasaya T 1979 Glycerol derivatives in the inner bark of Larix leptolepis Gord. Mokuzai Gakkaishi 25 361-366... 

Takehara T, Sasaya T 1979 Studies on the extractives of larch. Phenolic constituents from sap-wood of Larix leptolepis Cork. Hokkaido Daigaku Nogakubu Enshurin 36 681-693... 

Isolated from Japanese larch (Larix leptolepis) (14). 

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