Local light signaling at the leaf tip drives remote differential petiole growth through auxin-gibberellin dynamics.

ABSTRACT: Although plants are immobile, many of their organs are flexible to move in response to environmental cues. In dense vegetation, plants detect neighbors through far-red light perception with their leaf tip. They respond remotely, with asymmetrical growth between the abaxial and adaxial sides of the leafstalk, the petiole. This results in upward movement that brings the leaf blades into better lit zones of the canopy. The plant hormone auxin is required for this response, but it is not understood how non-differential leaf tip-derived auxin can remotely regulate movement. Here, we show that remote signaling of far-red light promotes auxin accumulation in the abaxial petiole. This local auxin accumulation is facilitated by reinforcing an intrinsic directionality of the auxin transport protein

SUBMITTER: Kupers JJ 

PROVIDER: S-EPMC9839380 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature