Interaction between row-type genes in barley controls meristem determinacy and reveals novel routes to improved grain.
barley (Hordeum vulgare)
branching
grain number
meristem
spikelet fertility
yield potential
Journal
The New phytologist
ISSN: 1469-8137
Titre abrégé: New Phytol
Pays: England
ID NLM: 9882884
Informations de publication
Date de publication:
03 2019
03 2019
Historique:
received:
17
05
2018
accepted:
22
09
2018
pubmed:
20
10
2018
medline:
15
1
2020
entrez:
20
10
2018
Statut:
ppublish
Résumé
Hordeum species develop a central spikelet flanked by two lateral spikelets at each inflorescence node. In 'two-rowed' spikes, the central spikelet alone is fertile and sets grain, while in 'six-rowed' spikes, lateral spikelets can also produce grain. Induced loss-of-function alleles of any of five Six-rowed spike (VRS) genes (VRS1-5) cause complete to intermediate gains of lateral spikelet fertility. Current six-row cultivars contain natural defective vrs1 and vrs5 alleles. Little information is known about VRS mechanism(s). We used comparative developmental, expression and genetic analyses on single and double vrs mutants to learn more about how VRS genes control development and assess their agronomic potential. We show that all VRS genes repress fertility at carpel and awn emergence in developing lateral spikelets. VRS4, VRS3 and VRS5 work through VRS1 to suppress fertility, probably by inducing VRS1 expression. Pairing vrs3, vrs4 or vrs5 alleles increased lateral spikelet fertility, despite the presence of a functional VRS1 allele. The vrs3 allele caused loss of spikelet identity and determinacy, improved grain homogeneity and increased tillering in a vrs4 background, while with vrs5, decreased tiller number and increased grain weight. Interactions amongst VRS genes control spikelet infertility, determinacy and outgrowth, and novel routes to improving six-row grain.
Identifiants
pubmed: 30339269
doi: 10.1111/nph.15548
pmc: PMC6492131
doi:
Substances chimiques
Plant Proteins
0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1950-1965Subventions
Organisme : Biotechnology and Biological Sciences Research Council
ID : BB/K01613X/1
Pays : United Kingdom
Organisme : Royal Society of Edinburgh
Pays : International
Informations de copyright
© 2018 The Authors. New Phytologist © 2018 New Phytologist Trust.
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