Genome-wide association study for phosphate deficiency responsive root hair elongation in chickpea

Pawandeep Singh Kohli, Pankaj Kumar Verma, Rita Verma, Swarup K. Parida, Jitendra K. Thakur, Jitender Giri

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Root hairs (RHs) are single-celled elongated epidermal cells and play a vital role in nutrient absorption, particularly for immobile minerals like phosphorus (P). As an adaptive response to P deficiency, an increase in RH length enhances root-soil contact and absorptive area for P absorption. Genetic variations have been reported for RH length and its response to P deficiency in plants. However, only a few association studies have been conducted to identify genes and genetic loci associated with RH length. Here, we screened desi chickpea accessions for RH length and its plasticity under P deficiency. Further, the genome-wide association study (GWAS) was conducted to identify the genetic loci associated with RH length in P deficient and sufficient conditions. Although high variability was observed in terms of RH length in diverse genotypes, majority of the accessions showed typical response of increase in RH length in low P. Genome-wide association mapping identified many SNPs with significant associations with RH length in P-sufficient and P-deficient conditions. A few candidate genes for RH length in P deficient (SIZ1-like and HAD superfamily protein) and sufficient (RSL2-like and SMAP1-like) conditions were identified which have known roles in RH development and P deficiency response or both. Highly associated loci and candidate genes identified in this study would be useful for genomic-assisted breeding to develop P-efficient chickpea.

Original languageEnglish
Pages (from-to)775-786
Number of pages12
JournalFunctional and Integrative Genomics
Volume20
Issue number6
DOIs
StatePublished - 1 Nov 2020
Externally publishedYes

Keywords

  • GWAS
  • Legume
  • P-uptake
  • Phosphate deficiency
  • Root hair
  • Root system architecture

ASJC Scopus subject areas

  • Genetics

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