University of Illinois Urbana-Champaign

Unlocking the genetic diversity of the undomesticated rice relative Oryza longistaminata

Labroo, Marlee Rose

Content Files
LABROO-THESIS-2017.pdf

Permalink

https://hdl.handle.net/2142/98308

Description

Title
Unlocking the genetic diversity of the undomesticated rice relative Oryza longistaminata
Author(s)
Labroo, Marlee Rose
Issue Date
2017-07-20
Director of Research (if dissertation) or Advisor (if thesis)
Sacks, Erik J.
Committee Member(s)
  • Moose, Stephen P.
  • Lipka, Alexander E.
Department of Study
Crop Sciences
Discipline
Crop Sciences
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Date of Ingest
2017-09-29T17:52:31Z
Keyword(s)
  • Plant breeding
  • Rice
  • Crop wild relatives
  • Oryza
Abstract
Rice (Oryza sativa) is a crucial part of the global food supply. Meeting projected increases in demand, which are rising fastest in sub-Saharan Africa, while using resources efficiently and adapting to a changing climate will require new sources of variation for trait improvement. The genetically diverse undomesticated African rice, Oryza longistaminata, which is native to a broad range of habitats throughout sub-Saharan Africa, is a valuable resource improving O. sativa with genes conferring biotic and abiotic stress tolerances, increased yield, super-ratooning ability, and floral traits conducive to hybrid rice production. The major obstacle to utilization of O. longistaminata in breeding programs is a breeding barrier which complicates interspecific hybridization with O. sativa, as well as the expense and difficulty of identifying which O. longistaminata accessions carrying useful genes. Breeding programs also rely on thorough ex-situ conservation of O. longistaminata, which enables long-term access to germplasm for breeders and other stakeholders. In this work, three genetic subpopulations were identified in O. longistaminata using individuals representing most of the species’ range genotyped with densely-spaced, genome-wide molecular markers. Spontaneous interspecific hybrids of O. longistaminata and O. sativa were discovered in germplasm from the International Rice Research Institute’s genebank, which can be used to accelerate introgression from O. longistaminata to O. sativa. A species distribution model of O. longistaminata was generated to identify sampling gaps in ex-situ collections, and environmental data was used to predict likely locations of O. longistaminata tolerant to abiotic stresses.
Graduation Semester
2017-08
Type of Resource
text
Permalink
http://hdl.handle.net/2142/98308
Copyright and License Information
Copyright 2017 Marlee R. Labroo

Owning Collections

Graduate Dissertations and Theses at Illinois PRIMARY
Graduate Theses and Dissertations at Illinois
Dissertations and Theses - Crop Sciences