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- W4311661321 abstract "Abstract Crosstalk between auxin and cytokinin contributes to widespread developmental processes, including root and shoot meristem maintenance, phyllotaxy, and vascular patterning. Although auxin and cytokinin are potent regulators of plant development, our understanding of crosstalk between these hormones is limited to few model systems. The moss Physcomitrium patens (formerly Physcomitrella patens ) is a powerful system for studying plant hormone function. Auxin and cytokinin play similar roles in regulating moss gametophore (upright shoot) architecture, as they do in flowering plant shoots. However, auxin-cytokinin crosstalk is poorly understood in moss. Here we find that the ratio of auxin to cytokinin is an important determinant of development in P. patens , especially during leaf development and branch stem cell initiation. Addition of high levels of auxin to P. patens gametophores blocks leaf outgrowth. However, simultaneous addition of high levels of both auxin and cytokinin partially restores leaf outgrowth, suggesting that the ratio of these hormones is the overriding factor. Likewise, during branch initiation and outgrowth, chemical inhibition of auxin synthesis phenocopies cytokinin application. Finally, cytokinin insensitive mutants resemble plants with altered auxin signaling and are hypersensitive to auxin. In summary, our results suggest that the ratio between auxin and cytokinin signaling is the basis for developmental decisions in the moss gametophore." @default.
- W4311661321 created "2022-12-27" @default.
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- W4311661321 date "2022-12-06" @default.
- W4311661321 modified "2023-10-15" @default.
- W4311661321 title "The ratio of auxin to cytokinin controls leaf development and meristem initiation in<i>Physcomitrium patens</i>" @default.
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- W4311661321 doi "https://doi.org/10.1101/2022.12.05.519125" @default.
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