Root-Shoot Signaling crosstalk involved in the shoot growth promoting action of rhizospheric humic acids

Numerous studies have shown the ability of humic substances to improve plant development. This action is normally reflected in an enhancement of crop yields and quality. However, the mechanisms responsible for this action of humic substances remain rather unknown. Our studies have shown that the sho...

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Detalles Bibliográficos
Autores: Olaetxea, Maite, Mora, Maria Veronica, Calderin García, Andrés, Azevedo Santos, Leandro, Baigorri, Roberto, Fuentes, Marta Cecilia, Garnica, María, Louro Berbara, Ricardo Luis, Zamarreño, Angel Maria, Garcia Mina, Jose M.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2016
País:Argentina
Institución:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/179675
Acceso en línea:http://hdl.handle.net/11336/179675
Access Level:acceso abierto
Palabra clave:HUMIC ACID
HUMIC SUBSTANCES
PLANT GROWTH
PLANT HORMONES
RHIZOSPHERE
ROOT GROWTH
SHOOT GROWTH
SIGNALING CROSSTALK
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
https://purl.org/becyt/ford/1.7
https://purl.org/becyt/ford/1.6
Descripción
Sumario:Numerous studies have shown the ability of humic substances to improve plant development. This action is normally reflected in an enhancement of crop yields and quality. However, the mechanisms responsible for this action of humic substances remain rather unknown. Our studies have shown that the shoot promoting action of sedimentary humic acids is dependent of its ability to increase root hydraulic conductivity through signaling pathways related to ABA, which in turn is affected in roots by humic acids in an IAA-NO dependent way. Furthermore, these studies also indicate that the primary action of humic acids in roots might also be physical, resulting from a transient mild stress caused by humic acids associated with a fouling-cleaning cycle of wall cell pores. Finally the role of alternative signal molecules, such as ROS, and corresponding signaling pathways are also discussed and modeled in the context of the above-mentioned framework.

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