Aus rice root architecture variation contributing to grain yield under drought suggests a key role of nodal root diameter class

Qiong Liao, Dmytro Chebotarov, Mohammad S Islam, Marinell R Quintana, Mignon A Natividad, Marjorie De Ocampo, Joseph C Beredo, Rolando O Torres, Zhenhua Zhang, Haixing Song, Adam H Price, Kenneth L McNally, Amelia Henry* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The aus rice variety group originated in stress-prone regions and is a promising source for the development of new stress-tolerant rice cultivars. In this study, an aus panel (~220 genotypes) was evaluated in field trials under well-watered and drought conditions and in the greenhouse (basket, herbicide and lysimeter studies) to investigate relationships between grain yield and root architecture, and to identify component root traits behind the composite trait of deep root growth. In the field trials, high and stable grain yield was positively related to high and stable deep root growth (r = 0.16), which may indicate response to within-season soil moisture fluctuations (i.e., plasticity). When dissecting component traits related to deep root growth (including angle, elongation and branching), the number of nodal roots classified as 'large-diameter' was positively related to deep root growth (r = 0.24), and showed the highest number of colocated genome-wide association study (GWAS) peaks with grain yield under drought. The role of large-diameter nodal roots in deep root growth may be related to their branching potential. Two candidate loci that colocated for yield and root traits were identified that showed distinct haplotype distributions between contrasting yield/stability groups and could be good candidates to contribute to rice improvement.

Original languageEnglish
Pages (from-to)854-870
Number of pages17
JournalPlant, Cell & Environment
Volume45
Issue number3
Early online date17 Feb 2022
DOIs
Publication statusPublished - 1 Mar 2022

Keywords

  • Chromosome Mapping
  • Droughts
  • Edible Grain
  • Genome-Wide Association Study
  • Oryza/physiology

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