A plant grown under canopies perceives the reduction in the ratio of red (R) to far-red (FR) light as a warning of competition, and enhances elongation growth in an attempt to overgrow its neighbors. Here, we report that the same low R/FR signal that induces hypocotyl elongation also triggers a rapid arrest of leaf primordium growth, ensuring that plant resources are redirected into extension growth. The growth arrest induced by low R/FR depends on auxin-induced cytokinin breakdown in incipient vein cells of developing primordia, thus demonstrating the existence of a previously unrecognized regulatory circuit underlying plant response to canopy shade.
Canopy shade causes a rapid and transient arrest in leaf development through auxin-induced cytokinin oxidase activity / M., Carabelli; M., Possenti; G., Sessa; Ciolfi, Andrea; G., Morelli; I., Ruberti; Sassi, Massimiliano. - In: GENES & DEVELOPMENT. - ISSN 0890-9369. - 21:15(2007), pp. 1863-1868. [10.1101/gad.432607]
Canopy shade causes a rapid and transient arrest in leaf development through auxin-induced cytokinin oxidase activity.
CIOLFI, ANDREA;SASSI, Massimiliano
2007
Abstract
A plant grown under canopies perceives the reduction in the ratio of red (R) to far-red (FR) light as a warning of competition, and enhances elongation growth in an attempt to overgrow its neighbors. Here, we report that the same low R/FR signal that induces hypocotyl elongation also triggers a rapid arrest of leaf primordium growth, ensuring that plant resources are redirected into extension growth. The growth arrest induced by low R/FR depends on auxin-induced cytokinin breakdown in incipient vein cells of developing primordia, thus demonstrating the existence of a previously unrecognized regulatory circuit underlying plant response to canopy shade.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.