Ferrous iron-induced increases in capitate glandular trichome density and upregulation of CbHO-1 contributes to increase
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ORIGINAL ARTICLE
Ferrous iron‑induced increases in capitate glandular trichome density and upregulation of CbHO‑1 contributes to increases in blinin content in Conyza blinii Tianrun Zheng1 · Maojia Wang1 · Junyi Zhan1 · Wenjun Sun1 · Qin Yang1 · Zhiyi Lin1 · Tongliang Bu1 · Zizhong Tang1 · Chenglei Li1 · Jun Yan2 · Zhi Shan1 · Hui Chen1 Received: 24 September 2020 / Accepted: 4 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Main conclusion Ferrous iron can promote the development of glandular trichomes and increase the content of blinin, which depends on CbHO-1 expression. Abstract Conyza blinii (C. blinii) is a unique Chinese herbal medicine that grows in Sichuan Province, China. Because the habitat of C. blinii is an iron ore mining area with abundant iron content, this species can be used as one of the best materials to study the mechanism of plant tolerance to iron. In this study, C. blinii was treated with ferrous-EDTA solutions at different concentrations, and it was found that the tolerance value of C. blinii to iron was 200 μM. Under this concentration, the plant height, root length, biomass, and iron content of C. blinii increased to the maximum values, and the effect was dependent on the upregulated expression of CbHO-1. At the same time, under ferrous iron, the photosynthetic capacity and capitate glandular trichome density of C. blinii also significantly increased, providing precursors and sites for the synthesis of blinin, thus significantly increasing the content of blinin. These processes were also dependent on the high expression of CbHO-1. Correlation analysis showed that there were strong positive correlations between iron content, capitate glandular trichome density, CbHO-1 gene expression, and blinin content. This study explored the effects of ferrous iron on the physiology and biochemistry of C. blinii, greatly improving our understanding of the mechanism of iron tolerance in C. blinii. Keywords Conyza blinii · Iron · CbHO-1 · Trichome · Blinin
Introduction Iron is an essential trace element for plant growth and development and is one of the four most abundant elements in the earth’s crust (constituting approximately 6% of the mineral elements in the soil). The active valence transition between Communicated by Anastasios Melis. Tianrun Zheng and Maojia Wang authors contributed equally to this work. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00425-020-03492-1) contains supplementary material, which is available to authorized users. * Hui Chen [email protected] Extended author information available on the last page of the article
bivalent iron and trivalent iron provides convenient conditions for electron transfer, which plays a very important role in plant biological activities (Aung et al. 2018). Iron participates in the synthesis of chlorophyll, oxidation–reduction reactions, electron transfer, and respiration during plant growth; in addition, iron is present in the active center and is a com
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