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Progress in research on dry afterripening

Published online by Cambridge University Press:  06 January 2011

Raquel Iglesias-Fernández
Affiliation:
Centro de Biotecnología y Genómica de Plantas (UPM-INIA), Universidad Politécnica de Madrid, Escuela Técnica Superior de Ingenieros Agrónomos, Campus de Montegancedo, 28223-Pozuelo de Alarcón, Madrid, Spain
María del Carmen Rodríguez-Gacio
Affiliation:
Departamento de Fisiología Vegetal, Universidad de Santiago de Compostela, 15782Santiago de Compostela, Spain
Angel J. Matilla*
Affiliation:
Departamento de Fisiología Vegetal, Universidad de Santiago de Compostela, 15782Santiago de Compostela, Spain
*
*Correspondence Fax: +34 981 593 054 Email: angeljesus.matilla@usc.es

Abstract

The transition from the dormant to the non-dormant state of a viable and mature seed can take place at low hydration by exposure to air-dry storage conditions (dry afterripening; AR). The events occurring during this loss of dormancy are of considerable physiological, ecological and agricultural interest. AR may be attributable to increased sensitivity to germination-stimulating factors and a widening of the temperature window for germination. Genetic, –omics and physiological studies on this mode of dormancy breaking provide support for a key role of the balance between gibberellin (GA) and abscisic acid (ABA) metabolism and sensitivity. Recent evidence also supports a possible role for ethylene (ET) in this complex signalling network that is necessary for AR implementation. However, hormone-independent signals, such as reactive oxygen species (ROS), nitrate () or nicotinamide adenine dinucleotide (NAD+), also appear to be involved. The way in which hormone- and non-hormone-signalling pathways affects each other (cross-talk) is still under study. This review provides updated information on the programmes that overcome seed dormancy. Thus, we have reviewed: (1) the –omic status in dry seeds; (2) the relationship between temperature and nitrate signalling and AR; (3) alterations in ABA/GA synthesis and signalling; (4) the action of hormone molecules other than ABA and GA (i.e. ET, salicylic and jasmonic acids); and (5) participation of reactive oxygen species (ROS), NAD+ and protein carbonylation. Taken together, the acquisition and implementation of dry AR involve a complex signalling network that is difficult to disentangle.

Type
Research Review
Copyright
Copyright © Cambridge University Press 2011

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