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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

Genetic factors controlling nTiO2 nanoparticles stress tolerance in barley (Hordeum vulgare) during seed germination and seedling development

Samar G. Thabet https://orcid.org/0000-0001-7861-8933 A * , Ahmed Sallam B , Yasser S. Moursi https://orcid.org/0000-0002-4036-0436 A , Mohamed A. Karam A and Ahmad M. Alqudah https://orcid.org/0000-0002-0436-9724 C *
+ Author Affiliations
- Author Affiliations

A Department of Botany, Faculty of Science, University of Fayoum, 63514 Fayoum, Egypt.

B Department of Genetics, Faculty of Agriculture, Assiut University, 71526 Assiut, Egypt.

C Department of Agroecology, Aarhus University, Flakkebjerg, 4200 Slagelse, Denmark.


Handling Editor: Honghong Wu

Functional Plant Biology 48(12) 1288-1301 https://doi.org/10.1071/FP21129
Submitted: 5 May 2021  Accepted: 30 September 2021   Published: 28 October 2021

© 2021 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Titanium dioxide nanoparticle (nTiO2) is one of the most produced nanoparticles worldwide. Its mechanism on crop development and performance is unclear as it is hard to predict their toxicity or benefit. Therefore, understanding the genetics of crop development under nTiO2 is a prerequisite for their applications in agriculture and crop improvement. Here, we aimed to examine the influnce of 300 ppm nTiO2 on seed germination, seedling morphology, root-related traits in 121 worldwide spring barley (Hordeum vulgare L.) accessions. Results show that nTiO2 significantley affected all traits scored in this study. Response to nTiO2 treatment, clear wide natural variation among accesions was detected. Remarkably, 10 genotypes showed increased root length under nTiO2 at the seedling stage indicating that nTiO2 enhanced the root elongation. Genome-wide association scan (GWAS) was applied using 9K single nucleotide polymorphism (SNPs) in a mixed-linear model that revealed 86 significant marker-trait associations with all traits scored in this study. Many significant SNPs were physically located near candidate genes, of which 191 genes were detected within the linkage disequilibrium and distributed over all barley chromosomes. Mostly, the genes harboured by chromosome 2H, specially calcium-binding genes family, regulate the variation of seedling length-related traits. Candidate genes on 7H encode zinc finger protein that controls the rate of germination. Therefore, these genomic regions at 2H and 7H can be targeted to select for improved seedling development and seed germination under nTiO2 stress in soils. These results improve understanding the genetic control of seed germination and seedling development under high levels of nTiO2 that can support plant breeding and crop improvement programmes.

Keywords: abiotic stress, barley, candidate genes, crop improvement, germination, GWAS, nanoparticles, nTiO2, root length, seedling.


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