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Evolution of Phosphate Metabolism and the Adaptation of Tibetan Wild Barley to Aluminum Stress
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  • Sheng-guan Cai,
  • Yuqin Huang,
  • Li-yuan Wu,
  • Dezhi Wu,
  • Rong Liu,
  • Meixue Zhou,
  • Guo-ping Zhang,
  • Zhonghua Chen
Sheng-guan Cai
Zhejiang University
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Yuqin Huang
Hangzhou Academy of Agricultural Sciences
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Li-yuan Wu
Zhejiang University
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Dezhi Wu
Zhejiang University
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Rong Liu
Western Sydney University - Penrith Campus
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Meixue Zhou
University of Tasmania
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Guo-ping Zhang
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Zhonghua Chen
University of Western Sydney
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Abstract

Aluminum (Al) toxicity in acid soils significantly affects plant growth, agricultural productivity and ecosystem health. Here we investigated plant Al tolerance from evolutionary physiological, molecular, and ecological perspectives. Genetic similarity and phylogenetic analysis of Al tolerance-associated gene families showed that many of these were conserved from streptophyte algae to angiosperms, indicating land plants have evolved gradually in adaptation to Al-rich acid soil during plant terrestrialization. In particular, vacuolar phosphate transporter SPX-major facility superfamily (SPX-MFS) and inorganic phosphate (Pi) transporter 1 subfamily (PHT1s) of streptophyte algae showed higher genetic similarity to land plants than chlorophyte algae. PHT1 subfamily exhibited a significant expand during the evolution from streptophyte algae to liverworts and then to eudicots. Moreover, we identified an Al-tolerant Tibetan wild barley accession XZ29, showing high levels of Phosphorus(P)-containing glycolytic intermediates under Al stress. We found a new Al-tolerance mechanism that Al-induced Pi efflux from root elongation zone to chelate rhizosphere Al3+ and immobilization of Al with P reduce Al accumulation in barley root cells. These results indicated that Tibetan wild barley has evolved unique P transport and metabolism for the adaptation to harsh conditions in eastern and southeastern Tibet where acid soils contain high P.

Peer review status:UNDER REVIEW

26 Feb 2020Submitted to Plant, Cell & Environment
27 Feb 2020Assigned to Editor
27 Feb 2020Submission Checks Completed
01 Mar 2020Reviewer(s) Assigned
16 Apr 2020Review(s) Completed, Editorial Evaluation Pending