Root-expressed phytochromes B1 and B2, but not PhyA and Cry2, regulate shoot growth in nature

Plant, Cell & Environment
Youngjoo OhIan T Baldwin

Abstract

Although photoreceptors are expressed throughout all plant organs, most studies have focused on their function in aerial parts with laboratory-grown plants. Photoreceptor function in naturally dark-grown roots of plants in their native habitats is lacking. We characterized patterns of photoreceptor expression in field- and glasshouse-grown Nicotiana attenuata plants, silenced the expression of PhyB1/B2/A/Cry2 whose root transcripts levels were greater/equal to those of shoots, and by micrografting combined empty vector transformed shoots onto photoreceptor-silenced roots, creating chimeric plants with "blind" roots but "sighted" shoots. Micrografting procedure was robust in both field and glasshouse, as demonstrated by transcript accumulation patterns, and a spatially-explicit lignin visual reporter chimeric line. Field- and glasshouse-grown plants with PhyB1B2, but not PhyA or Cry2, -blind roots, were delayed in stalk elongation compared with control plants, robustly for two field seasons. Wild-type plants with roots directly exposed to FR phenocopied the growth of irPhyB1B2-blind root grafts. Additionally, root-expressed PhyB1B2 was required to activate the positive photomorphogenic regulator, HY5, in response to aboveground ...Continue Reading

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Citations

Oct 20, 2019·Journal of Integrative Plant Biology·Yong ZouIan T Baldwin
Jan 26, 2021·Plant Science : an International Journal of Experimental Plant Biology·Victor D'Amico-DamiãoRogério F Carvalho
Jul 10, 2021·Frontiers in Plant Science·Jae Young KimChung-Mo Park

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