Reproductive resilience but not root architecture underpins yield improvement under drought in maize

Carlos Messina, Dan McDonald, Hanna Poffenbarger, Randy Clark, Andrea Salinas, Yinan Fang, Carla Gho, Tom Tang, Geoff Graham, Graeme L. Hammer, Mark Cooper

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Because plants capture water and nutrients through roots, it was proposed that changes in root systems architecture (RSA) might underpin the 3-fold increase in maize (Zea mays L.) grain yield over the last century. Here we show that both RSA and yield have changed with decades of maize breeding, but not the crop water uptake. Results from X-ray phenotyping in controlled environments showed that single cross (SX) hybrids have smaller root systems than double cross (DX) hybrids for root diameters between 2465 μm and 181μm (P<0.05). Soil water extraction measured under field conditions ranged between 2.6 mm d-1 and 2.9 mm d-1 but were not significantly different between SX and DX hybrids. Yield and yield components were higher for SX than DX hybrids across densities and irrigation (P<0.001). Taken together, the results suggest that changes in RSA were not the cause of increased water uptake but an adaptation to high-density stands used in modern agriculture. This adaptation may have contributed to shift in resource allocation to the ear and indirectly improved reproductive resilience. Advances in root physiology and phenotyping can create opportunities to maintain long-Term genetic gain in maize, but a shift from ideotype to crop and production system thinking will be required.

Original languageEnglish
Pages (from-to)5235-5245
Number of pages11
JournalJournal of Experimental Botany
Volume72
Issue number14
DOIs
StatePublished - Jul 10 2021

Bibliographical note

Publisher Copyright:
© 2021 The Author(s) 2021. Published by Oxford University Press on behalf of the Society for Experimental Biology.

Keywords

  • Drought tolerance
  • Genetic gain
  • Maize
  • Reproductive resilience
  • Root systems architecture
  • Water use

ASJC Scopus subject areas

  • Physiology
  • Plant Science

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