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Contribution of constitutive characteristics of lipids and phenolics in roots of tree species in Myrtales to aluminum tolerance

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Title: Contribution of constitutive characteristics of lipids and phenolics in roots of tree species in Myrtales to aluminum tolerance
Authors: Maejima, Eriko Browse this author
Osaki, Mitsuru Browse this author →KAKEN DB
Wagatsuma, Tadao Browse this author
Watanabe, Toshihiro Browse this author →KAKEN DB
Issue Date: May-2017
Publisher: John Wiley & Sons
Journal Title: Physiologia Plantarum
Volume: 160
Issue: 1
Start Page: 11
End Page: 20
Publisher DOI: 10.1111/ppl.12527
PMID: 27800617
Abstract: High aluminum (Al) concentration in soil solution is the most important factor restricting plant growth in acidic soils. However, various plant species naturally grow in such soils. Generally, they are highly tolerant to Al, but organic acid exudation, the most common Al tolerance mechanism, cannot explain their tolerance. Lower phospholipid and higher sterol proportions in root plasma membrane enhance Al tolerance. Other cellular components, such as cell walls and phenolics, may also be involved in Al tolerance mechanisms. In this study, the relationships between these cellular components and the Al tolerance mechanisms in Melastoma malabathricum and Melaleuca cajuputi, both highly Al-tolerant species growing in strongly acidic soils, were investigated. Both species contained lower proportions of phospholipids and higher proportions of sterols in roots, respectively. Concentrations of phenolics in roots of both species were higher than that of rice; their phenolics could form chelates with Al. In these species, phenolic concentrations and composition were the same irrespective of the presence or absence of Al in the medium, suggesting that a higher concentration of phenolics is not a physiological response to Al but a constitutive characteristic. These characteristics of cellular components in roots may be cooperatively involved in their high Al tolerance.
Type: article
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 渡部 敏裕

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