Letter

A trehalose-6-phosphate phosphatase enhances anaerobic germination tolerance in rice

Received:
Accepted:
Published online:

Abstract

Global socioeconomic developments create strong incentives for farmers to shift from transplanted to direct-seeded rice (DSR) as a means of intensification and economization1. Rice production must increase to ensure food security2 and the bulk of this increase will have to be achieved through intensification of cultivation, because expansion of cultivated areas is reaching sustainable limits3. Anaerobic germination tolerance, which enables uniform germination and seedling establishment under submergence4, is a key trait for the development of tropical DSR varieties5,6. Here, we identify a trehalose-6-phosphate phosphatase gene, OsTPP7, as the genetic determinant in qAG-9-2, a major quantitative trait locus (QTL) for anaerobic germination tolerance7. OsTPP7 is involved in trehalose-6-phosphate (T6P) metabolism, central to an energy sensor that determines anabolism or catabolism depending on local sucrose availability8,9. OsTPP7 activity may increase sink strength in proliferating heterotrophic tissues by indicating low sugar availability through increased T6P turnover, thus enhancing starch mobilization to drive growth kinetics of the germinating embryo and elongating coleoptile, which consequently enhances anaerobic germination tolerance.

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Author information

Author notes

    • David J. Mackill
    •  & Endang M. Septiningsih

    Present address: MARS Inc., Department of Plant Sciences, University of California Davis, California 95616, USA (D.J.M.); Department of Soil and Crop Sciences, Texas A&M University, College Station, Texas 77843, USA (E.M.S.).

Affiliations

  1. International Rice Research Institute, DAPO Box 7777, Metro Manila, Philippines

    • Tobias Kretzschmar
    • , Margaret Anne F. Pelayo
    • , Kurniawan R. Trijatmiko
    • , Lourd Franz M. Gabunada
    • , Rosario Jimenez
    • , Inez H. Slamet-Loedin
    • , Nese Sreenivasulu
    • , Abdelbagi M. Ismail
    • , David J. Mackill
    •  & Endang M. Septiningsih
  2. University of the Philippines, Los Banos, Laguna 4031, Philippines

    • Lourd Franz M. Gabunada
    •  & Merlyn S. Mendioro
  3. Center for Plant Cell Biology, Department of Botany and Plant Sciences, University of California Riverside, Riverside, California 92521, USA

    • Rejbana Alam
    •  & Julia Bailey-Serres

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Contributions

E.M.S., T.K., D.J.M. and A.M.I. designed the experiments; E.M.S. fine-mapped the QTL; K.R.T. developed the OX lines; L.F.G. performed phenotyping in the laboratory; J.B.-S. assisted in analysing RNA-Seq data; R.A. performed qRT–PCR; N.S. and R.J. performed metabolomics profiling; T.K. with assistance of M.A.P. performed the rest of the experiments; J.B.-S and M.S.M. provided advice about the experiments; I.S.-L. provided technical assistance and infrastructure for rice transformation; T.K. and E.M.S. wrote the manuscript; J.B.-S., N.S., D.J.M. and A.M.I. edited the manuscript; all authors read and approved the manuscript.

Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Endang M. Septiningsih.

Supplementary information