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.
2007
arabidopsis; developmental; gene expression regulation; genes; genetically modified; genetics; genetics/growth /&/ development/metabolism/radiation effects; genetics/metabolism; glucuronidase; growth /&/ development/metabolism/radiation effects; indoleacetic acids; metabolism; oxidoreductases; photobiology; plant; plant leaves; plants; reporter; signal transduction
01 Pubblicazione su rivista::01a Articolo in rivista
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]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/509396
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