Plant Morphology and a Phytochrome B Model Reveal That the Effects of Far-Red Light on Shade-Avoidance-Like Responses Persist Under High Light Intensity.

ABSTRACT: Several studies have concluded that high photon flux density (PFD) attenuates the effects of the red (R; 600-699 nm) to far-red (FR; 700-750 nm) light ratio on morphology. However, the suppressive effects can depend on individual wavebands that modulate photoreceptor activity. We postulated that morphological responses of shade-avoiding plants to the FR fraction (FR-PFD divided by R + FR PFD) act independent of total PFD (TPFD; 400-750 nm) when TPFD increases are only from R and FR light. We grew kale and lettuce under three FR fractions and four TPFDs while maintaining a constant blue (B; 400-499 nm) PFD. An increase in the R + FR PFD reduced leaf elongation and specific leaf area (SLA). However, higher light did not suppress the FR-fraction effects on leaf elongation and SLA. We estimate

SUBMITTER: Shin J 

PROVIDER: S-EPMC12223715 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature