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Transcriptomic analysis of CDL-gated photoperiodic flowering mechanisms in cannabis and their responsiveness to R: FR ratios in controlled environment agriculture
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Transcriptomic analysis of CDL-gated photoperiodic flowering mechanisms in cannabis and their responsiveness to R: FR ratios in controlled environment agriculture
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Journal Article
Transcriptomic analysis of CDL-gated photoperiodic flowering mechanisms in cannabis and their responsiveness to R: FR ratios in controlled environment agriculture
2025
Overview
While discrete regulatory mechanisms have been identified, a unified model for the transcriptional activation of photoperiodic flowering in short-day (SD) plants has not been delineated. Although the
GIGANTEA-CONSTANS-FLOWERING LOCUS T
(
GI-CO-FT
) pathway appears to be highly conserved, each species may differ in its blueprint for activation of
FT
and floral meristem identity. In cannabis, an SD plant,
PSEUDO-RESPONSE-REGULATOR 37 (PRR37
) has a causal effect in determining photoperiod sensitivity. This study identifies a network of
WITH NO LYSINE (K)
kinases (
WNK
) which may be regulating the PRR proteins and downstream genes, including florigen (
FT
). CO-like genes have been identified in cannabis, but their function in regulating
FT
has not been determined. This study shows that in cannabis, CO is critically-day-length-gated (CDL) and down-regulated by short days, likely to act as a repressor of
FT
. We demonstrate that CDL-gated gene expression can be manipulated in cannabis horticulture through modifying the R:FR ratio of LED lighting, where increased expression of
COL5
in response to light treatment is inversely related with expression of
FT
. Building on these insights, we propose a model for the CDL-gated regulation of
FT
expression in cannabis.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
