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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Plant Sci. | doi: 10.3389/fpls.2019.01346

Seed Coat Pattern QTL and Development in Cowpea (Vigna unguiculata [L.] Walp.)

  • 1Department of Botany and Plant Sciences, University of California, Riverside, United States
  • 2Department of Nematology, University of California, Riverside, United States
  • 3Department of Computer Sciences and Engineering, University of California, Riverside, United States

The appearance of the seed is an important aspect of consumer preference for cowpea (Vigna unguiculata [L.] Walp.). Seed coat pattern in cowpea has been a subject of study for over a century. This study makes use of newly available resources, including mapping populations, a reference genome and additional genome assemblies, and a high-density single nucleotide polymorphism genotyping platform, to map various seed coat pattern traits to three loci, concurrent with the Color Factor (C), Watson (W), and Holstein (H) factors identified previously. Several gene models encoding proteins involved in regulating the later stages of the flavonoid biosynthesis pathway have been identified as candidate genes, including a basic helix-loop-helix gene (Vigun07g110700) for the C locus, a WD-repeat gene (Vigun09g139900) for the W locus and an E3 ubiquitin ligase gene (Vigun10g163900) for the H locus. A model of seed coat development, consisting of six distinct stages, is described to explain some of the observed pattern phenotypes.

Keywords: cowpea, seed coat, pigment, pattern, QTL, Vigna unguiculata

Received: 25 Mar 2019; Accepted: 27 Sep 2019.

Copyright: © 2019 Herniter, Lo, Muñoz-Amatriaín, Lo, Guo, Huynh, Lucas, Jia, Roberts, Close and Lonardi. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Mr. Ira A. Herniter, Department of Botany and Plant Sciences, University of California, Riverside, Riverside, 92521, United States, ihern014@ucr.edu