ArticleThe New phytologist2026
A PLETHORA3/7 transcription factor shapes cucumber shoot architecture.
Article in The New phytologist, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
PLETHORA transcription factors (PLTs) are master regulators of plant development. Loss of shoot meristematic PLTs leads to reduced phyllotactic regularity and robustness in Arabidopsis and increased inflorescence branching in tomato. Whether these factors have similar functions in other species is not known. To address this knowledge gap, we integrated phylogenetic, transcriptomic, and genome-wide in vitro binding strategies with quantitative shoot architecture phenotyping of a panel of cucumber TILLING mutants of each CsPLT homolog. We determined that CsPLT3/7 and CsPLT5 are expressed in complementary domains in the cucumber shoot apex. DAP-seq data indicated that both transcription factors recognised an ANT-like consensus motif and bound to SAM-organising genes. We identified strong phenotypic defects in multiple Csplt3/7 mutants. In mature seeds, Csplt3/7 mutants formed a flat apex instead of a shoot apical meristem, from which secondary meristems emerged during subsequent seedling development. Mature Csplt3/7 shoots exhibited defects in internode length regularity, stem architecture, flower morphology, and axillary organ initiation. Moreover, phyllotactic patterns were slightly shifted from a spiral towards a distichous orientation. We present one of the first pieces of evidence that the PLT3/7 clade fulfils both conserved and diversified roles in shoot development across taxonomic family boundaries.
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