Genotypic differences in shoot silicon concentration and the impact on grain arsenic concentration in rice

Partha Talukdar* (Corresponding Author), Sue E. Hartley, Anthony J. Travis, Adam H. Price, Gareth J. Norton

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Silicon in rice (Oryza sativa L.) has been demonstrated to be involved in resistance to lodging, drought, and salinity, and also enhances resistance to pests and diseases. The aim of this study was to determine the range of silicon concentration in a set of rice (Oryza sativa L.) accessions, and to determine if the natural variation of shoot silicon is linked to the previously identified silicon transporters (Lsi genes). Silicon concentration was determined in 50 field-grown accessions, representing all sub-populations of rice, with all accessions being genotyped with 700K SNPs. SNPs within 10 kb of the Lsi genes were examined to determine if any were significantly linked with the phenotypic variation. An XRF method of silicon determination compared favourably with digestion and colorimetric analysis. There were significant genotypic differences in shoot silicon ranging from 16.5 to 42.4 mg g −1 of plant dry weight, but there was no significant difference between the rice sub-populations. Plants with different alleles for SNPs representing Lsi2 and Lsi3 were significantly different for shoot silicon concentration. Shoot silicon correlated negatively with grain arsenic in the tropical and temperate japonica sub-population, suggesting that accessions with high shoot silicon have reduced grain arsenic. This study indicates that alleles for Lsi genes are excellent candidate genes for further study to explain the natural variation of shoot silicon in rice.

Original languageEnglish
Pages (from-to)265-276
Number of pages12
JournalJournal of Plant Nutrition and Soil Science
Volume182
Issue number2
Early online date19 Feb 2019
DOIs
Publication statusPublished - Apr 2019

Fingerprint

silicon
arsenic
rice
shoot
shoots
subpopulation
gene
Oryza sativa
allele
genes
alleles
lodging
X-ray fluorescence
phenotypic variation
transporters
digestion
drought
pests
salinity

Keywords

  • arsenic
  • natural variation
  • Oryza sativa
  • silicon
  • XRF

ASJC Scopus subject areas

  • Soil Science
  • Plant Science

Cite this

Genotypic differences in shoot silicon concentration and the impact on grain arsenic concentration in rice. / Talukdar, Partha (Corresponding Author); Hartley, Sue E.; Travis, Anthony J.; Price, Adam H.; Norton, Gareth J.

In: Journal of Plant Nutrition and Soil Science, Vol. 182, No. 2, 04.2019, p. 265-276.

Research output: Contribution to journalArticle

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