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Molecules 2014, 19(8), 10922-10935; doi:10.3390/molecules190810922

Accumulation of Astragalosides and Related Gene Expression in Different Organs of Astragalus Membranaceus Bge. var Mongholicus (Bge.)

1
Department of Crop Science, Chungnam National University, 99 Daehak-Ro, Yuseong-gu, Daejeon 305-764, Korea
2
Department of Integrative Plant Science, Chung-Ang University, Anseong 456-756, Korea
3
Department of Botany and Microbiology, Addiriyah Chair for Environmental Studies, College of Science, King Saud University, P. O. Box 2455, Riyadh 11451, Saudi Arabia
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 21 April 2014 / Revised: 17 July 2014 / Accepted: 22 July 2014 / Published: 25 July 2014
(This article belongs to the Section Natural Products)
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Abstract

Astragalus membranaceus is one of the most important traditional Korean and Chinese medicinal herbs because it contains triterpenoid saponins (astragaloside I, II, III, and IV), which have beneficial and pharmacological effects on health. In this study, we analyzed 10 mevalonate pathway genes that are involved in astragaloside biosynthesis using the Illumina/Solexa HiSeq2000 platform. We determined the expression levels of the 10 genes using quantitative real-time PCR, and analyzed the accumulation of astragalosides in different organs using high-performance liquid chromatography. Genes related to the mevalonate pathway were expressed in different levels in different organs. Almost all genes showed high transcript levels in the stem and leaf, with the lowest transcript levels being recorded in the root. In contrast, most astragalosides accumulated in the root. In particular, the astragaloside IV content was distributed in the following order: root (0.58 mg/g DW) > flower (0.27 mg/g DW) > stem (0.23 mg/g DW) > leaf (0.04 mg/g DW). In the root, astragaloside II exhibited the highest content (2.09 mg/g DW) compared to astragaloside I, III, and IV. Notably, gene expression did not follow the same pattern as astragaloside accumulation. We suggest carefully that astragalosides are synthesized in the leaves and stem and then translocated to the root. This study contributes towards improving our understanding of astragaloside biosynthesis in A. membranaceus. View Full-Text
Keywords: Astragalus membranaceus; astragalosides; gene expression; mevalonate pathway; triterpenoid saponin Astragalus membranaceus; astragalosides; gene expression; mevalonate pathway; triterpenoid saponin
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Kim, Y.B.; Thwe, A.A.; Li, X.; Tuan, P.A.; Lee, S.; Lee, J.W.; Arasu, M.V.; Al-Dhabi, N.A.; Park, S.U. Accumulation of Astragalosides and Related Gene Expression in Different Organs of Astragalus Membranaceus Bge. var Mongholicus (Bge.). Molecules 2014, 19, 10922-10935.

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