2012 Fiscal Year Final Research Report
Elucidating Aluminum Accumulation Mechanisms in Theaceae
| Project/Area Number |
23658122
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Forest science
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| Research Institution | The University of Tokyo |
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Principal Investigator |
OSAWA Hiroki 東京大学, 大学院・農学生命科学研究科, 助教 (90401182)
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| Co-Investigator(Renkei-kenkyūsha) |
TANGE Takeshi 東京大学, 大学院・農学生命科学研究科, 教授 (20179922)
KOJIMA Katsumi 東京大学, アジア生物資源環境研究センター, 教授 (80211895)
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| Project Period (FY) |
2011 – 2012
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| Keywords | ツバキ科 / アルミニウム / 酸性土壌 / プロアントシアジニン / 根 / ヒメシャラ / モッコク |
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| Research Abstract |
In the future identification of molecular components for accumulation-based aluminum tolerance, we need to find key physiological processes of aluminum hyperaccumulation in plants. We surveyed eight plant species of two related families represented by the tea plant and identified seven aluminum-hyperaccumulators that share a common proanthocyanidin accumulation in root endodermis cells. In contrast, Ternstroemia gymnanthera, a sole aluminum non-accumulator species surveyed in the present study, had no PA accumulation in most of xylem loading parts. Despite the diversity of leaf phenotype and seasonality, proanthocyanidin accumulation in xylem appeared likely to have a common mode of action among the aluminum-hyperaccumulator species, and their long-distance transport of aluminum were accompanied by proanthocyanidin transport. However, Neither aluminum-induction patterns nor stoichiometry with aluminum were found in the xylem proanthocyanidin contents among the aluminum-accumulator phenotypes, implying that additional components other than proanthocyanidins may be involved in the aluminum transport in xylems. This work is the first comprehensive study that quantitatively analyses the aluminum and proanthocyanidin accumulation pattern of related families of woody plant species. These findings regarding key physiological processes of aluminum accumulation in the related species could lead to a better understanding of the molecular and evolutionary functions of the hyperaccumulation of harmful metals, long-distance transport of water and solutes, and defense mechanisms of leaves.
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