The Brittle Rachis Trait in Species Belonging to the Triticeae and Its Controlling Genes Btr1 and Btr2

Xiaoxue Zeng, Kohei Mishina, Juqing Jia, Assaf Distelfeld, Peter Jeff Maughan, Shinji Kikuchi, Hidenori Sassa, Takao Komatsuda

Research output: Contribution to journalArticlepeer-review

Abstract

In many non-cultivated angiosperm species, seed dispersal is facilitated by the shattering of the seed head at maturity; in the Triticeae tribe, to which several of the world's most important cereals belong, shattering takes the form of a disarticulation of the rachis. The products of the genes Btr1 and Btr2 are both required for disarticulation to occur above the rachis nodes within the genera Hordeum (barley) and Triticum/Aegilops (wheat). Here, it has been shown that both Btr1 and Btr2 are specific to the Triticeae tribe, although likely paralogs (Btr1-like and Btr2-like) are carried by the family Poaceae including Triticeae. Aegilops tauschii (the donor of the bread wheat D genome) lacks a copy of Btr1 and disarticulation in this species occurs below, rather than above the rachis node; thus, the product of Btr1 appears to be required for disarticulation to occur above the rachis node.

Original languageEnglish
Article number1000
JournalFrontiers in Plant Science
Volume11
DOIs
StatePublished - 22 Jul 2020

Keywords

  • Triticeae
  • disarticulation
  • duplication
  • phylogeny
  • seed dispersal

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