Abscisic Acid Synthesis, Metabolism and Signal Transduction

Marion‐Poll, Annie; Leung, Jeffrey

doi:10.1002/9780470988800.ch1

Cited by 12 publications

(4 citation statements)

References 192 publications

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“…Thus, most intermediates and enzymes involved in its synthesis have been identified and a large number of genes and mutants related to the ABA biosynthetic pathway were also isolated and characterized. 8,[16][17][18][19] But their regulation has mainly been studied in vegetative…”

Section: Aba Biosynthesis Pathway and Temporal And Spatial Expression Of Its Biosynthetic Genes In Seedsmentioning

confidence: 99%

Seed dormancy and ABA signaling

Rodríguez-Gacio

Matilla-Vázquez

Matilla

2009

Plant Signaling & Behavior

170

104

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The seed is an important organ of higher plants regarding plant survival and species dispersion. The transition between seed dormancy and germination represents a critical stage in the plant life cycle and it is an important ecological and commercial trait. A dynamic balance of synthesis and catabolism of two antagonistic hormones, abscisic acid (ABA) and giberellins (GAs), controls the equilibrium between seed dormancy and germination. Embryonic ABA plays a central role in induction and maintenance of seed dormancy, and also inhibits the transition from embryonic to germination growth. Therefore, the ABA metabolism must be highly regulated at both temporal and spatial levels during phase of dessication tolerance. On the other hand, the ABA levels do not depend exclusively on the seeds because sometimes it becomes a strong sink and imports it from the roots and rhizosphere through the xylem and/or phloem. All theses events are discussed in depth here. Likewise, the role of some recently characterized genes belonging to seeds of woody species and related to ABA signaling, are also included. Finally, although four possible ABA receptors have been reported, not much is known about how they mediate ABA signalling transduction. However, new publications seem to shown that almost all these receptors lack several properties to consider them as such.

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Section: Aba Biosynthesis Pathway and Temporal And Spatial Expression Of Its Biosynthetic Genes In Seedsmentioning

confidence: 99%

Seed dormancy and ABA signaling

Rodríguez-Gacio

Matilla-Vázquez

Matilla

2009

Plant Signaling & Behavior

170

104

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“…ABA in higher plants is derived from C 40 carotenoids. The precursor of ABA is zeaxanthin, which is converted into xanthoxin by a series of enzyme-mediated epoxidation and isomerization steps, and a final dioxygenation reaction that cleaves the compound from C 40 carotenoid (Nambara and Marion-Poll 2005;Marion-Poll and Leung 2006).…”

Section: Introductionmentioning

confidence: 99%

Short-term cold stress in two cultivars of Digitaria eriantha: effects on stress-related hormones and antioxidant defense system

et al. 2010

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The two cultivars of Digitaria eriantha: cv. Sudafricana (a cold-sensitive cultivar) and cv. Mejorada INTA (a cold-resistant cultivar) were exposed to low temperature and compared in terms of the involvement of abscisic acid (ABA) and catabolites, jasmonates, and antioxidant defense in cold tolerance. Cold stress caused a greater ABA increase in cv. Mejorada INTA than in cv. Sudafricana. In both cultivars abscisic acid glucose ester and dihydrophaseic acid were the most abundant catabolites. Cold treatment decreased JA in leaves of both cultivars. In cv. Sudafricana, 12-hydroxyjasmonate (12-OH-JA) decreased and 12-oxophytodienoic acid increased. In regard to antioxidant defense, both cultivars increased the non-protein thiols in response to cold stress. However, reduced glutathione (GSH) level was higher in leaves of cv. Mejorada INTA than cv. Sudafricana. Cold-treated leaves of cv. Sudafricana increased thiobarbituric acid-reactive substances (TBARS), but cv. Mejorada INTA leaves showed no such increase. Superoxide dismutase activity decreased and ascorbate peroxidase activity increased in cold-treated leaves of cv. Sudafricana. No significant change of these enzymes was observed for cv. Mejorada INTA. The cold tolerance of cv. Mejorada INTA could be related to JA, 12-OH-JA and GSH high basal contents, ABA increase, and TBARS stability after cold treatment.

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“…The plant hormone abscisic acid (ABA) 1 is involved in the regulation of numerous physiological processes during seed development, including embryo maturation, storage product deposition, inhibition of precocious germination, desiccation tolerance and dormancy (Marion-Poll and Leung, 2006). Levels of ABA 1 in seed tissues at the appropriate developmental time, regulated by a balance of biosynthesis, catabolism and transport, are thought to be critical for proper seed development (Frey et al, 2004).…”

Section: Introductionmentioning

confidence: 99%