Establishment of callus induction system, histological evaluation and taxifolin production of Larch

Abstract Taxifolin in larch is an important natural active ingredient, which prevents and treats liver diseases and cardiovascular diseases, and has many health benefits and application values ​​such as anti-tumor, anti-virus, and anti-aging. However, the traditional extraction method is not conducive to the protection of the ecological environment, and also limits the industrial production of taxifolin from larch. Therefore, the purpose of this research is to establish a larch callus culture system and obtain taxifolin from callus. The shoots of the stem-tips of Larix olgensis were used as explants to be cultured. The light conditions, optimal medium and hormone ratio for callus induction were screened to evaluate the callus induction characteristics of larch and its influence on the accumulation of taxifolin. The results showed that: callus formation started on 28–51 days, and the best conditions for inducing callus were explored: 12 h/d light culture MS + 2,4-D 2 mg/L + 6-BA 1 mg/ L + KT 0.1 mg/L; the callus induction rate is 50%-80%; the highest condition for producing taxifolin 6-BA 1 mg/L + NAA 0.1 mg/L, reaching 0.414%. In conclusion, this study represents a suitable induction condition for larch callus culture and taxifolin accumulation.