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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Lignin content in the stem of P. yunnanensis on days 1, 7, and 14 under light irradiation. The abscissa represents the days of treatment, and the ordinate represents the content of lignin.