Studies on the constituents of the annual shoots of Larix leptolepis GORDON (V)

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Six flavonoid com-pounds were isolated from the annual shoots of 5-year-old L. leptolepis collected on June 19 and 20, 1976, during the growing season, the compounds were identified as kaempferol-3-0-glucoside (III), kaempferol-3-0-galactoside (VI), kaempferol-3-O-p-coumaroylglucoside (II), isorhamnetin-3-0-glucoside (V), taxifolin-3'-O-glucoside (IV), catechin (I), respectively, on the basis of the results of IR, UV, MS, NMR spectra, acid hydrolysis, preparation of derivatives and so forth. Fur-thermore, eriodictyol (VII), taxifolin (VIII), epiafzelechin (IX) were determined in the aglycone fraction, and quercetin (X) was determined in the hydrolysis prod-ucts of glycoside fraction by TLC. The effects of kaempferol-3-0-glucoside and IAA upon the growth of the roots of the seedlings of L. leptolepis were investi-gated to clarify the function of kaempferol-3-O-glucoside as a co-factor of IAA oxidase. It was not prove that kaempferol-3-O-glucoside acted as a co-factor of IAA oxidase because IAA stimulated the growth of the roots in high concentration while kaempferol-3-O-glucoside stimulated the growth of the roots in low concen-tration. The effects of catechin and taxifolin upon the cuttings of the hypocotyles and the annual shoots of L. leptolepis as possible rooting inhibitor were studied, but no inhibition of rooting was observed with these substances in any respect.
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