Morphological diversity and genetic regulation of inflorescence abscission zones in grasses

Andrew N. Doust, Margarita Mauro-Herrera, Amie D. Francis, Laura C. Shand

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Premise of the study: Variation in how seeds are dispersed in grasses is ecologically important, and selection for dispersal mechanisms has produced a great variety of dispersal structures (diaspores). Abscission (“shattering”) is necessary in wild grasses, but its elimination by selection on nonshattering mutants was a key component of the domestication syndrome in cereal grasses. A key question is whether a common genetic pathway controls abscission in wild grasses, and, if so, what genes in that pathway may have been selected upon during domestication. We summarize morphological and genetic information on abscission zones and disarticulation patterns in grasses and identify hypotheses to test the likelihood of a common genetic pathway.

Methods: Morphological data on abscission zones for over 10 000 species of grasses were tabulated and analyzed using a tribal phylogeny of the grasses. The genomic location of quantitative trait loci (QTLs) and orthologs of genes controlling shattering were compared across species to ascertain whether the same loci might control shattering in different grass lineages.

Results and conclusions: The simple trait of nonshattering is derived from a great diversity of shattering phenotypes. Several sets of QTLs from multiple species are syntenic yet many are not. Genes known to be involved in shattering in several species were found to have orthologs that sometimes colocalized with QTLs in different species, adding support to the hypothesis of retention of a common genetic pathway. These results are used to suggest a research plan that could test the common genetic pathway model more thoroughly.

Original languageEnglish
Pages (from-to)1759-1769
Number of pages11
JournalAmerican Journal of Botany
Volume101
Issue number10
DOIs
StatePublished - 1 Oct 2014
Externally publishedYes

Fingerprint

Inflorescence
abscission
Poaceae
inflorescences
grass
grasses
Quantitative Trait Loci
quantitative trait loci
domestication
gene
Disarticulation
diaspore
Internal-External Control
genes
regulation
Genetic Models
Phylogeny
cereal
Genes
phenotype

Keywords

  • Abscission zone
  • Diaspore
  • Disarticulation
  • Domestication
  • Genetic regulation
  • Grasses
  • Inflorescence morphology
  • Poaceae
  • Seed dispersal
  • Shattering

Cite this

Doust, Andrew N. ; Mauro-Herrera, Margarita ; Francis, Amie D. ; Shand, Laura C. / Morphological diversity and genetic regulation of inflorescence abscission zones in grasses. In: American Journal of Botany. 2014 ; Vol. 101, No. 10. pp. 1759-1769.
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Morphological diversity and genetic regulation of inflorescence abscission zones in grasses. / Doust, Andrew N.; Mauro-Herrera, Margarita; Francis, Amie D.; Shand, Laura C.

In: American Journal of Botany, Vol. 101, No. 10, 01.10.2014, p. 1759-1769.

Research output: Contribution to journalArticle

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