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Euphytica

, 215:72 | Cite as

Identification of novel mutations in genes involved in silicon and arsenic uptake and accumulation in rice

  • HyunJung Kim
  • Thomas H. TaiEmail author
Article
  • 13 Downloads

Abstract

Novel mutations in rice genes involved in silicon (Si) and arsenic (As) transport (Lsi1, Lsi2) and vacuolar sequestration of As (OsABCC1) were identified using reverse genetics. TILLING by sequencing of a population of chemically-induced mutants (n = 2048) detected 61 putative mutations. Following removal of mutations predicted to be synonymous or residing in introns, Sanger sequencing confirmed 21 of 23 nonsynonymous mutations and 13 M3 lines harboring homozygous mutant alleles (three lsi1, nine lsi2, and one Osabcc1) were identified for phenotyping. Altered sensitivity to germanium (Ge), a phytotoxic analog of Si, was observed in three lines. NM-E1746 and NM-3403 (both lsi1) had increased tolerance whereas NM-3036 (lsi2) was more sensitive, however, this appears unrelated to the mutation. Analysis of the straw from field grown plants revealed that NM-E1746 and NM-3403 were the only lines with significant reductions in total Si. Both mutants also had significant increases in total As and NM-3403 exhibited higher grain total As. The third lsi1 mutant (NM-3380) and two lsi2 mutants (NM-2902 and NM-2249) had increased straw total As. Increased grain total As was observed in NM-2902, NM-2249, and a third lsi2 mutant NM-E2244. Interestingly, NM-4903 (Osabcc1) had the highest total Si and was also the only line to have significantly less straw and grain total As. These novel mutant alleles represent useful genetic resources for further dissection of Si, As, and Ge transport in rice and the corresponding germplasm has potential for enhancing rice productivity and quality.

Keywords

Silicon and arsenic transport Reverse genetics Oryza sativa L. OsLsi1 OsLsi2 OsABCC1 Induced mutations As vacuolar sequestration 

Notes

Acknowledgements

This work was supported by Unites States Department of Agriculture, Agricultural Research Service CRIS Project 2032-21000-021-00D and the California Rice Research Board RB-3 Project (2015–2018) to T.H.T. The authors thank Sarah C. Magee for technical support for phenotyping. Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the U.S. Department of Agriculture. USDA is an equal opportunity provider and employer.

Supplementary material

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Supplementary material 1 (PPTX 49 kb)
10681_2019_2393_MOESM2_ESM.docx (21 kb)
Supplementary material 2 (DOCX 21 kb)
10681_2019_2393_MOESM3_ESM.docx (15 kb)
Supplementary material 3 (DOCX 15 kb)

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Copyright information

© This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply 2019

Authors and Affiliations

  1. 1.Department of Plant SciencesUniversity of CaliforniaDavisUSA
  2. 2.USDA-ARS Crops Pathology and Genetics Research UnitDavisUSA
  3. 3.LG Chem, Ltd.Gangseo-guRepublic of Korea

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