Ectopic expression of Triticum polonicum VRT-A2 underlies elongated glumes and grains in hexaploid wheat in a dosage-dependent manner

@article{Adamski2020EctopicEO,
  title={Ectopic expression of Triticum polonicum VRT-A2 underlies elongated glumes and grains in hexaploid wheat in a dosage-dependent manner},
  author={Nikolai M. Adamski and James Simmonds and Jemima Brinton and Anna E. Backhaus and Yi Chen and Mark A. Smedley and Sadiye Hayta and Tobin Florio and Pamela Crane and Peter Scott and Alice Pieri and Olyvia Hall and J. Elaine Barclay and Myles Clayton and John H. Doonan and Candida Nibau and Cristobal Uauy},
  journal={The Plant Cell},
  year={2020},
  volume={33},
  pages={2296 - 2319}
}
Flower development is a major determinant of yield in crops. In wheat, natural variation for the size of spikelet and floral organs is particularly evident in Triticum polonicum, a tetraploid subspecies of wheat with long glumes, lemmas, and grains. Using map-based cloning, we identified VRT2, a MADS-box transcription factor belonging to the SVP family, as the gene underlying the P1 locus. The causal P1 mutation is a sequence substitution in intron-1 that results in both increased and ectopic… 
The Triticum ispahanicum elongated glume locus P2 maps to chromosome 6A and is associated with the ectopic expression of SVP-A1
In rice and wheat, glume and floral organ length are positively correlated with grain size, making them an important target to increase grain size and potentially yield. The wheat subspecies Triticum
High expression of the MADS-box gene VRT2 increases the number of rudimentary basal spikelets in wheat
Abstract Spikelets are the fundamental building blocks of Poaceae inflorescences, and their development and branching patterns determine the various inflorescence architectures and grain yield of
Interactions Between SQUAMOSA and SVP MADS-box Proteins Regulate Meristem Transitions During Wheat Spike Development
TLDR
It is proposed that SQUAMosA-SVP complexes act during the early reproductive phase to promote heading, formation of the terminal spikelet, and stem elongation, but that down-regulation of SVP genes is then necessary for the formation of SQUAMOSA-SEPALLATA complexes that are required for normal spikelet and floral development.
MicroRNA-resistant alleles of HOMEOBOX DOMAIN-2 modify inflorescence branching and increase grain protein content of wheat
Plant and inflorescence architecture determine the yield potential of crops. Breeders have harnessed natural diversity for inflorescence architecture to improve yields, and induced genetic variation
Interactions between SQUAMOSA and SHORT VEGETATIVE PHASE MADS-box proteins regulate meristem transitions during wheat spike development
TLDR
It is proposed that SQUAMOSA–SVP interactions are important to promote heading, formation of the TS, and stem elongation during the early reproductive phase, and that downregulation of SVP genes is then necessary for normal spikelet and floral development.
Rudimentary basal spikelets in wheat 1 High expression of VRT 2 increases the number of rudimentary basal 2 spikelets in wheat 3
33 Spikelets are the fundamental building blocks of Poaceae inflorescences and their development 34 and branching patterns determine the various inflorescence architectures and grain yield of 35
High expression of VRT2 during wheat spikelet initiation increases the number of rudimentary basal spikelets
TLDR
It is suggested that the delayed transition of basal spikelets from vegetative to floral developmental programmes results in the lanceolate shape of wheat spikes, and the value of spatially resolved transcriptomics is highlighted to gain new insights into developmental genetics pathways of grass inflorescences.
Genetic identification of the pleiotropic gene Tasg-D1/2 affecting wheat grain shape by regulating brassinolide metabolism.
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