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Physiological characterization of aluminum tolerance and accumulation in tartary and wild buckwheat

文献类型： 外文期刊

作者： Wang, Hua 1 ; Chen, Rong Fu 3 ; Iwashita, Takashi 4 ; Shen, Ren Fang 3 ; Ma, Jian Feng 1 ;

作者机构： 1.Okayama Univ, Inst Plant Sci & Resources, Kurashiki, Okayama 7100046, Japan

2.Zhejiang Acad Agr Sci, Inst Crop & Nucl Technol Utilizat, State Key Lab Breeding Base Zhejiang Sustainable, Hangzhou 310021, Zhejiang, Peoples R China

3.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China

4.Suntory Fdn Life Sci, Bioorgan Res Inst, Shimamoto, Osaka 6188503, Japan

关键词： Al-27-nuclear magnetic resonance (NMR);Al form;aluminum (Al) accumulation;Fagopyrum;organic acid secretion

期刊名称：NEW PHYTOLOGIST （ 影响因子：10.151； 五年影响因子：10.475 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Ionic aluminum (Al) is toxic for plant growth, but some plant species are able to accumulate Al at high concentrations without showing toxicity symptoms. In order to determine whether other species in the genus Fagopyrum are able to accumulate Al like common buckwheat (Fagopyrum esculentum), we investigated the external and internal detoxification mechanisms of Al in two self-compatible species: tartary (Fagopyrum tataricum) and wild buckwheat (Fagopyrum homotropicum). Both tartary and wild buckwheat showed high Al tolerance comparable to common buckwheat. Furthermore, these two species also secreted oxalate rapidly from the roots in response to Al in a time-dependent manner. Both tartary and wild buckwheat accumulated >1mgg(-1) Al in the leaves after short-term exposure to Al. Analysis with Al-27-nuclear magnetic resonance (NMR) revealed that Al was present in the form of Al-oxalate (1:3 ratio) in the roots and leaves, but in the form of Al-citrate (1:1 ratio) in the xylem sap in both species. These results indicate that similar to common buckwheat, both tartary and wild buckwheat detoxify Al externally and internally, respectively, by secreting oxalate from the roots and by forming the Al-oxalate complex, which is a nonphytotoxic form. These features of Al response and accumulation may be conserved in genus Fagopyrum.

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