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QTL mapping and candidate gene analysis of ferrous iron and zinc toxicity tolerance at seedling stage in rice by genome-wide association study. | LitMetric

AI Article Synopsis

  • Ferrous iron (Fe) and zinc (Zn) in high concentrations negatively affect rice growth and quality, so understanding the genetics behind rice's resistance to these metals is important for improving production.
  • A study identified 29 QTL for various growth traits in relation to Fe and 31 QTL for Zn, including five that show tolerance to both metals in similar genetic regions.
  • The findings suggest that certain genes may help rice plants tolerate Fe and Zn toxicity, offering insights for future breeding programs aimed at enhancing rice resilience through genetic selection.

Article Abstract

Background: Ferrous iron (Fe) and zinc (Zn) at high concentration in the soil cause heavy metal toxicity and greatly affect rice yield and quality. To improve rice production, understanding the genetic and molecular resistance mechanisms to excess Fe and Zn in rice is essential. Genome-wide association study (GWAS) is an effective way to identify loci and favorable alleles governing Fe and Zn toxicty as well as dissect the genetic relationship between them in a genetically diverse population.

Results: A total of 29 and 31 putative QTL affecting shoot height (SH), root length (RL), shoot fresh weight (SFW), shoot dry weight (SDW), root dry weight (RDW), shoot water content (SWC) and shoot ion concentrations (SFe or SZn) were identified at seedling stage in Fe and Zn experiments, respectively. Five toxicity tolerance QTL (qSdw3a, qSdw3b, qSdw12 and qSFe5 / qSZn5) were detected in the same genomic regions under the two stress conditions and 22 candidate genes for 10 important QTL regions were also determined by haplotype analyses.

Conclusion: Rice plants share partial genetic overlaps of Fe and Zn toxicity tolerance at seedling stage. Candidate genes putatively affecting Fe and Zn toxicity tolerance identified in this study provide valuable information for future functional characterization and improvement of rice tolerance to Fe and Zn toxicity by marker-assisted selection or designed QTL pyramiding.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5658907PMC
http://dx.doi.org/10.1186/s12864-017-4221-5DOI Listing

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