Auxin is required for the long coleoptile trait in japonica rice under submergence. Issue 1 (25th July 2020)

• Record Type: Journal Article
• Authors: Nghi, Khac Nhu; Tagliani, Andrea; Mariotti, Lorenzo; Weits, Daan A.; Perata, Pierdomenico; Pucciariello, Chiara
• Is Part Of: New phytologist. Volume 229:Issue 1(2021)
• Page Start: 85
• Page End: 93
• Publication Date: 2020-07-25
• Subjects: auxin -- coleoptile -- hypoxia -- Oryza sativa -- rice -- submergence; Botany -- Periodicals; 580
• DOI: 10.1111/nph.16781
• Languages: English
• ISSNs: 0028-646X

Abstract

Summary: Rice coleoptile elongation under submergence guarantees fast seedling establishment in the field. We investigated the role of auxin in influencing the capacity of rice to produce a long coleoptile under water. In order to explore the complexity of auxin's role in coleoptile elongation, we used gene expression analysis, confocal microscopy of an auxin‐responsive fluorescent reporter, gas chromatography coupled to tandem mass spectrometry (GC–MS/MS), and T‐DNA insertional mutants of an auxin transport protein. We show that a higher auxin availability in the coleoptile correlates with the final coleoptile length under submergence. We also identified the auxin influx carrier AUX1 as a component influencing this trait under submergence. The coleoptile tip is involved in the final length of rice varieties harbouring a long coleoptile. Our experimental results indicate that auxin biosynthesis and transport underlies the differential elongation between short and long coleoptile‐harbouring japonica rice varieties. Abstract : See also the Editorial on this article by Sasidharan et al., 229 : 5–7 .