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Plant Physiology Reports

, Volume 24, Issue 2, pp 155–167 | Cite as

Root anatomical traits of wild-rices reveal links between flooded rice and dryland sorghum

  • Raju Bheemanahalli
  • Sherry Hechanova
  • Jena K. Kshirod
  • S. V. Krishna JagadishEmail author
Original Article

Abstract

The root anatomical and morphological traits and their plasticity under water deficit are essential to improve adaptation of rice cultivars to water-limited conditions. We investigated wild-rice accessions along with a dryland cereal (Sorghum bicolor) for root related traits under non-stress and water deficit during panicle initiation and flowering. Wild-rices from GG genome (Oryza granulata and Oryza meyeriana) recorded high similarity with sorghum in key root anatomical parameters such as larger stele diameter in proportion to root diameter (SD:RD [%]) and more late metaxylem number (LMXN). Comparative analyses between wild-rice accessions and a diverse indica panel revealed narrow genetic variability in LMXN and SD:RD in Oryza sativa panel compared to O. granulata and O. meyeriana. Wild-rices from GG genome had a combination of favorable anatomy (larger SD:RD and more but smaller late metaxylem) and root morphology (thinner roots and higher root surface area) during panicle initiation and flowering compared to popular rice cultivar IR64. The above combination can help facilitate effective water use by regulating axial water flow under water-deficit conditions, while the opposite was noticed in the drought susceptible IR64. Novel sources for root anatomical traits identified from wild-rice accessions can be utilized in rice breeding programs to develop water-deficit stress tolerant rice cultivars.

Keywords

Oryza Root anatomy Water-deficit stress Wild-rices Sorghum Panicle initiation Flowering 

Notes

Acknowledgements

This work was supported by the USAID-BMGF-funded Cereal Systems Initiative for South Asia (Phase II). Partial support from The Federal Ministry for Economic Cooperation and Development, Germany (Contract No. 81141844; Project No. 11.7860.7-001.00) is also acknowledged.

Compliance with ethical standards

Conflicts of interest

The authors declare that they have no conflict of interest.

Supplementary material

40502_2019_451_MOESM1_ESM.docx (5.1 mb)
Supplementary material 1 (DOCX 5198 kb)

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Copyright information

© Indian Society for Plant Physiology 2019

Authors and Affiliations

  1. 1.International Rice Research InstituteMetro ManilaPhilippines
  2. 2.Department of AgronomyKansas State UniversityManhattanUSA

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