Formation and breakdown of ABA

Cutler, Adrian J.; Krochko, Joan E.

doi:10.1016/s1360-1385(99)01497-1

Cited by 423 publications

(332 citation statements)

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“…Generally, the carotenoid composition of plant roots has hardly been studied but it is well-documented that roots do contain carotenoids, for example -carotene, -carotene, lutein and violaxanthin (Maudinas and Lematre 1979;Baranska et al 2006). Carotenoid cleavage is commonly assumed to occur in plastids, after which the cleavage products are exported to the cytosol (Cutler and Krochko 1999;Laule et al 2003). However, several studies have suggested that the CCD1 enzymes reside in the cytosol.…”

Section: Characterisation Of Maize Ccd1 Cdnas Transcripts and Recombmentioning

confidence: 99%

Cloning and characterisation of a maize carotenoid cleavage dioxygenase (ZmCCD1) and its involvement in the biosynthesis of apocarotenoids with various roles in mutualistic and parasitic interactions

Sun¹,

Hans

Walter

et al. 2008

Planta

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Colonisation of maize roots by arbuscular mycorrhizal (AM) fungi leads to the accumulation of apocarotenoids (cyclohexenone and mycorradicin derivatives). Other root apocarotenoids (strigolactones) are involved in signalling during early steps of the AM symbiosis but also in stimulation of germination of parasitic plant seeds. Both apocarotenoid classes are predicted to originate from cleavage of a carotenoid substrate by a carotenoid cleavage dioxygenase (CCD), but the precursors and cleavage enzymes are unknown. A Zea mays CCD (ZmCCD1) was cloned by RT-PCR and characterised by expression in carotenoid accumulating E. coli strains and analysis of cleavage products using GC-MS. ZmCCD1 eYciently cleaves carotenoids at the 9, 10 position and displays 78% amino acid identity to Arabidopsis thaliana CCD1 having similar properties. ZmCCD1 transcript levels were shown to be elevated upon root colonisation by AM fungi. Mycorrhization led to a decrease in seed germination of the parasitic plant Striga hermonthica as examined in a bioassay. ZmCCD1 is proposed to be involved in cyclohexenone and mycorradicin formation in mycorrhizal maize roots but not in strigolactone formation.

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Section: Characterisation Of Maize Ccd1 Cdnas Transcripts and Recombmentioning

confidence: 99%

Cloning and characterisation of a maize carotenoid cleavage dioxygenase (ZmCCD1) and its involvement in the biosynthesis of apocarotenoids with various roles in mutualistic and parasitic interactions

Sun¹,

Hans

Walter

et al. 2008

Planta

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“…Changes in ABA concentration within embryos and surrounding seed tissues can contribute to dormancy inception, maintenance, and termination (Cutler and Krochko 1999;others 2000, 2002). However, it is clear that levels of ABA and ABA catabolites in plant cells and tissues are under constant flux as a result of the opposing forces of biosynthesis versus degradation (reviewed in Cutler and Krochko 1999;Seo and Koshiba 2002).…”

Section: Post-translational Modification and Protein Degradationmentioning

confidence: 99%

“…However, it is clear that levels of ABA and ABA catabolites in plant cells and tissues are under constant flux as a result of the opposing forces of biosynthesis versus degradation (reviewed in Cutler and Krochko 1999;Seo and Koshiba 2002). Thus, ABA amount is not likely to be immediately indicative of changes in dormancy status; rather, the capacity for biosynthesis versus catabolism (metabolic flux) is a superior indicator of whether a seed will or will not terminate dormancy (that is, germinate).…”

Section: Post-translational Modification and Protein Degradationmentioning

confidence: 99%

“…Abscisic acid and ABA metabolites (PA and DPA) can also become conjugated with glucose, forming an ester or glucoside. Other minor pathways include formation of 7¢ hydroxy-ABA (7¢OH-ABA) and ABA 1¢,4¢ diols (Cutler and Krochko 1999;Zeevaart 1999).…”

Section: Post-translational Modification and Protein Degradationmentioning

confidence: 99%

“…For example, the importance of ABA catabolism via 8¢ hydroxylation versus other pathways of catabolism (for example, those involving 7¢ or 9¢ hydroxylation of ABA) varies between species and even between different tissues and different developmental stages of the same species (Cutler and Krochko 1999;Zeevaart 1999;Zhou and others 2004). This is the case in Western white pine seeds.…”

Section: Post-translational Modification and Protein Degradationmentioning

confidence: 99%

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Role of Abscisic Acid in Seed Dormancy

Kermode

2005

J Plant Growth Regul

251

160

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Seed dormancy is an adaptive trait that improves survival of the next generation by optimizing the distribution of germination over time. The agricultural and forest industries rely on seeds that exhibit high rates of germination and vigorous, synchronous growth after germination; hence dormancy is sometimes considered an undesirable trait. The forest industry encounters problems with the pronounced dormancy of some conifer seeds, a feature that can lead to non-uniform germination and poor seedling vigor. In cereal crops, an optimum balance is most sought after; some dormancy at harvest is favored because it prevents germination of the physiologically mature grain in the head prior to harvest (that is, preharvest sprouting), a phenomenon that leads to considerable damage to grain quality and is especially prominent in cool moist environments. The sesquiterpene abscisic acid (ABA) regulates key events during seed formation, such as the deposition of storage reserves, prevention of precocious germination, acquisition of desiccation tolerance, and induction of primary dormancy. Its regulatory role is achieved in part by cross-talk with other hormones and their associated signaling networks, via mechanisms that are largely unknown. Quantitative genetics and functional genomics approaches will contribute to the elucidation of genes and proteins that control seed dormancy and germination, including components of the ABA signal transduction pathway. Dynamic changes in ABA biosynthesis and catabolism elicit hormone-signaling changes that affect downstream gene expression and thereby regulate critical checkpoints at the transitions from dormancy to germination and from germination to growth. Some of the recent developments in these areas are discussed.

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Molecular Bases of Plant Adaptation to Abiotic Stress and Approaches to Enhance Tolerance to Hostile Environments

Coraggio

Tuberosa

2004

Handbook of Plant Biotechnology

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Abiotic stress has become the greatest threat to global food production and security, particularly in developing countries. Progress in increasing yield and its stability under adverse conditions through a direct selection has been hampered by the low heritability of yield, especially under drought. A better knowledge of the molecular and genetic basis of the mechanisms promoting tolerance to abiotic stress will enhance our capacity to more appropriately manipulate the genes limiting crop yield under hostile environments. This review describes and critically analyses the major advances in our understanding of the complex mechanisms underlying the adaptive response of the plant to abiotic stress, starting with the perception of the stress at the cellular level, its transduction through a cascade of signalling molecules and ending with the induction of genes whose products mitigate the harmful effects of the stress. Molecular markers and the ‘omics’ platforms (e.g., transcriptomics, proteomics, metabolomics etc.) offer unprecedented opportunities to identify and clone the genes governing plant adaptation to environmental stress and limiting yield under such conditions. The dissection of the genetic basis of quantitative traits into their single components, the so‐called QTLs (quantitative trait loci), allows us to deploy marker‐assisted selection (MAS) for enhancing crop performance under adverse conditions. Additional opportunities are also offered by genetic engineering, particularly through the expression of transcription factors regulating a suite of genes whose product is crucial to mitigate the effects of stress. Although the applicative results so far achieved with non‐conventional approaches have been limited, their integration with conventional breeding methodologies and other interdisciplinary approaches will greatly enhance our capacity to more effectively tailor crop genome to withstand harsh environmental conditions and to improve their sustainability under marginal conditions.

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Formation and breakdown of ABA

Cited by 423 publications

References 41 publications

Cloning and characterisation of a maize carotenoid cleavage dioxygenase (ZmCCD1) and its involvement in the biosynthesis of apocarotenoids with various roles in mutualistic and parasitic interactions

Cloning and characterisation of a maize carotenoid cleavage dioxygenase (ZmCCD1) and its involvement in the biosynthesis of apocarotenoids with various roles in mutualistic and parasitic interactions

Role of Abscisic Acid in Seed Dormancy

Molecular Bases of Plant Adaptation to Abiotic Stress and Approaches to Enhance Tolerance to Hostile Environments

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