(+)-Abscisic Acid 8′-Hydroxylase Is a Cytochrome P450 Monooxygenase

Krochko, Joan E.; Abrams, Garth D.; Loewen, Michèle C.; Abrams, Suzanne R.; Cutler, Adrian J.

doi:10.1104/pp.118.3.849

Cited by 209 publications

(145 citation statements)

References 57 publications

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“…On the other hand, some P450 whose function is unknown, is expressed after decapitation. A membrane-bound cytochrome P450 monooxygenase catalyzed the conversion of ABA to 8Ј-hydroxy-ABA, inactive ABA (Krochko et al, 1998). Although ABA 8Ј-hydroxylase has not been identified at the molecular level, P450 could be ABA 8Ј-hydroxylase.…”

Section: Molecular Approachmentioning

confidence: 99%

Control of Outgrowth and Dormancy in Axillary Buds

2001

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The shoot system has an important role in generating a large variety of diverse plant forms (Steeves and Sussex, 1989). The overall architecture of the shoot system is derived from the activity of the primary shoot apical meristem (SAM), arising during embryogenesis, together with the activity of the additional meristems subsequently formed after seed germination. The primary SAM provides the main axis of the plant body. Plant architecture is further modified by shoot branching that results from the activity of the additional meristems. The complexity of the branching pattern depends on the temporal and spatial development of these branches. These characteristics, although they are plastic in their response to environmental cues, are genetically determined. The developmental program that specifies branching patterns in different plant species is fundamentally important for generating species-specific plant forms.The shoot branching process generally involves two developmental stages: the formation of axillary meristems in the leaf axils and the growth of axillary buds. In many plant species, the growth of axillary meristems is inhibited by the primary shoot or primary inflorescence. This phenomenon is generally known as apical dominance. The plant hormones auxin and cytokinin are thought to have a major role in controlling this process (Phillips, 1975;Cline, 1994;Tamas, 1995;Napoli et al., 1999). Auxin has an inhibitory effect on the growth of axillary buds, whereas cytokinin promotes axillary bud outgrowth. The mechanisms of axillary bud outgrowth depend on the ratio of these two hormones rather than the absolute levels of either hormone.A variety of experimental approaches have been used to examine the mechanisms controlling dormancy and outgrowth of axillary buds. These range from physiological studies, such as measurement and exogenous application of plant hormones, to analyses of transgenic plants overexpressing hormone biosynthetic genes to alter endogenous hormone levels. Isolation and characterization of mutations that cause alterations in shoot branching patterns are powerful approaches. These molecular genetic approaches combined with the conventional physiological studies, such as grafting experiments, revealed that not only do auxin and cytokinin function to control the growth of axillary buds, but other factors and/or signals also have important roles. More recently, the genes expressed in dormant axillary buds were isolated and characterized.This review focuses on recent findings uncovered by physiological, genetic, and molecular studies and approaches to investigate the control of shoot branching, apical dominance, and dormancy in plants. DEVELOPMENT AND POTENTIAL OF AXILLARY MERISTEMS

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Section: Molecular Approachmentioning

confidence: 99%

Control of Outgrowth and Dormancy in Axillary Buds

2001

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“…The WRKY gene family had been revealed to participate in multiple fiber developmental processes [29]. Two genes encoding ABA 8'-hydroxylase (Gh_A08G1344 and Gh_D08G1639), a type of cytochrome P450 monooxygenase, in catalyzing the first step in oxidative degradation of ABA were down-regulated [30] [31]. ABA American Journal of Plant Sciences was reported to play a negative role in fiber development [11].…”

Section: Global Transcriptome Changes In Phya1 Rnai Plant Fiber Develmentioning

confidence: 99%

Transcriptome Analysis of Ten-DPA Fiber in an Upland Cotton (<i>Gossypium hirsutum</i>) Line with Improved Fiber Traits from Phytochrome A1 RNAi Plants

Miao¹,

Deng²,

Saha³

et al. 2017

AJPS

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Silencing phytochrome A1 gene (PHYA1) by RNA interference in Upland cotton (Gossypium hirsutum L. cv. Coker 312) had generated PHYA1 RNAi lines with improved fiber quality (longer, stronger and finer fiber). To reveal molecular mechanisms that govern fiber development with positive fiber traits, a study of global gene expression profiling of 10-DPA fibers in a PHYA1 RNAi line and its parent Coker 312 was conducted by high-throughput RNA sequencing. A comparative analysis of transcriptomes between the two lines had identified 142 genes that were differentially expressed in the 10-DPA fiber of the RNAi line. Gene Ontology analysis showed that these differentially expressed genes were mainly involved in metabolic pathways, heterocyclic/organic cyclic compound binding and multiple enzyme activities, and cell structures which were reported to play important roles in fiber development. Twenty-eight KEGG pathways were mapped for the 142 genes, and the pathways related to glycolysis/gluconeogenesis and pyruvate metabolism were the most abundant and followed by cytochrome P450-involved pathways, suggesting that fiber improvement could be through the regulation of proteins involved in cytochrome P450 pathways. Genes encoding WRKY transcription factors, sucrose synthase, xyloglucan endotransglucosylase hydrolase, udp-glucuronate: xylan alpha-glucuronosyltransferase, and genes involved in lipid metabolism and

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“…Phaseic acid (PA), a terpenoid catabolite of abscisic acid (ABA), is generated spontaneously after 8'-hydroxylation of ABA by cytochrome P450s in the CYP707A subfamily (1). In higher plants, PA and ABA act as phytohormones regulating important physiological functions in growth and development, as well as in responses to biotic and abiotic stress (cold, drought, heat exposure, salinity).…”

Section: Introductionmentioning

confidence: 99%

“…The principal oxidative pathway of natural (+)-ABA, mediated by cytochrome P-450 monooxygenases, occurs through hydroxylation of the 8'-methyl group resulting in 8'-hydroxyABA, which rearranges to (-)-PA (1). Further enzymatic reduction of (-)-PA leads to the production of DPA.…”

Section: Introductionmentioning

confidence: 99%

Phaseic Acid, an Endogenous and Reversible Inhibitor of Glutamate Receptors in Mouse Brain

Hou

Jiang

Zaharia

et al. 2016

Journal of Biological Chemistry

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(+)-Abscisic Acid 8′-Hydroxylase Is a Cytochrome P450 Monooxygenase

Cited by 209 publications

References 57 publications

Control of Outgrowth and Dormancy in Axillary Buds

Control of Outgrowth and Dormancy in Axillary Buds

Transcriptome Analysis of Ten-DPA Fiber in an Upland Cotton (<i>Gossypium hirsutum</i>) Line with Improved Fiber Traits from Phytochrome A1 RNAi Plants

Phaseic Acid, an Endogenous and Reversible Inhibitor of Glutamate Receptors in Mouse Brain

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(+)-Abscisic Acid 8′-Hydroxylase Is a Cytochrome P450 Monooxygenase

Cited by 209 publications

References 57 publications

Control of Outgrowth and Dormancy in Axillary Buds

Control of Outgrowth and Dormancy in Axillary Buds

Transcriptome Analysis of Ten-DPA Fiber in an Upland Cotton (&lt;i&gt;Gossypium hirsutum&lt;/i&gt;) Line with Improved Fiber Traits from Phytochrome A1 RNAi Plants

Phaseic Acid, an Endogenous and Reversible Inhibitor of Glutamate Receptors in Mouse Brain

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Transcriptome Analysis of Ten-DPA Fiber in an Upland Cotton (<i>Gossypium hirsutum</i>) Line with Improved Fiber Traits from Phytochrome A1 RNAi Plants