Bridging old and new: diversity and evaluation of high iron-associated stress response of rice cultivated in West Africa.

Abstract:

:Adoption of rice varieties that perform well under high iron-associated (HIA) stress environments can enhance rice production in West Africa. This study reports the genetic characterization of 323 rice accessions and breeding lines cultivated in West Africa using genotyping-by-sequencing and their phenotypic response to HIA treatments in hydroponic solution (1500 mg l-1 FeSO4·7H2O) and hot-spot fields. The germplasm consisted of four genetic subpopulations: Oryza glaberrima (14%), O. sativa-japonica (7%), O. sativa-indica Group 1 (45%), and O. sativa-indica Group 2 (25%). Severe versus mild stress in the field was associated with a reduced SPAD value (12%), biomass (56%), and grain yield (57%), with leaf bronzing explaining 30% and 21% of the variation for biomass and grain yield, respectively. Association mapping using 175 indica genotypes identified 23 significant single nucleotide polymorphism (SNP) markers that mapped to 14 genomic regions. Genome-wide association study (GWAS) signals associated with leaf bronzing, a routinely used indicator of HIA stress, differed in hydroponic compared with field conditions. Contrastingly, six significant SNPs on chromosomes 8 and 9 were associated with the SPAD value under HIA stress in both field and hydroponic experiments, and a candidate potassium transporter gene mapped under the peak on chromosome 8. This study helps define criteria for assessing rice performance under HIA environments.

journal_name

J Exp Bot

authors

Diop B,Wang DR,Drame KN,Gracen V,Tongoona P,Dzidzienyo D,Nartey E,Greenberg AJ,Djiba S,Danquah EY,McCouch SR

doi

10.1093/jxb/eraa182

subject

Has Abstract

pub_date

2020-07-06 00:00:00

pages

4188-4200

issue

14

eissn

0022-0957

issn

1460-2431

pii

5819036

journal_volume

71

pub_type

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