Euphytica

, 213:171 | Cite as

Perennial wheat lines have highly admixed population structure and elevated rates of outcrossing

  • J. Piaskowski
  • Kevin Murphy
  • Theodore Kisha
  • Stephen Jones
Article

Abstract

Perennial wheat has been proposed to alleviate long standing issues with soil erosion in annual cropping systems, while supporting rural communities and providing grain farmers with a marketable climate-resilient crop. The Washington State University perennial wheat breeding program has created several hundred interspecific progeny by crossing several different cultivars of winter wheat (Triticum aestivum L.) with Thinopyrum species and × Agrotriticum spp. Prior to the chromosome composition of these wheat-wheatgrass derivatives was not characterized, limiting their utility as stable breeding germplasm. We determined the mitotic chromosome number and species origin of chromosomes for eight breeding lines, and estimated their relatedness and population structure using AFLPs. Additionally, self-pollination and outcrossing rates were estimated for these breeding lines to gain an understanding of perennial wheat’s reproductive strategy. We intercrossed the lines with each other to produce 20 families and then measured the level of chromosome pairing during meiosis I in the F1 progeny. The lines contained between 44 and 64 chromosomes, of which eight to 16 were from Th. ponticum. Our analysis of molecular diversity indicated greater genetic diversity within, rather than across, breeding lines (88 and 12%, respectively). The outcrossing rate was estimated at 16%. Understanding chromosome number and origin is necessary for developing a population of breeding lines that can be used as parents. Our results suggest that the perennial wheat breeding lines act as a single diverse population that can be improved using breeding strategies for inbred and outcrossing crops.

Keywords

Cytogenetics Dryland agriculture Perennial wheat Population genetics Wheat 

Supplementary material

10681_2017_1961_MOESM1_ESM.docx (778 kb)
Supplementary material 1 (DOCX 778 kb). A supplementary file containing additional tables and figures has been provided: (1) photo of hybrid progeny meiotic cell; (2) photo of somatic chromosomes from a perennial wheat/Th. ponticum F1 progeny mitotic cell; (3) photo of regrowth from perennial wheat line/Th. ponticum cross progeny; (4) summary of cross families between the perennial wheat lines; (5) primer sequences for the selective amplification; (6) distribution of unpaired chromosomes from the inter-hybrid progeny; and (7) regrowth results and cytogenetic and morphological characterization of perennial wheat/Th. ponticum progeny

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Copyright information

© Springer Science+Business Media B.V. 2017

Authors and Affiliations

  1. 1.Department of HorticultureWashington State UniversityPullmanUSA
  2. 2.Department of Crop & Soil SciencesWashington State UniversityPullmanUSA
  3. 3.Western Plant Introduction StationUSDA-ARSPullmanUSA
  4. 4.BurlingtonUSA

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