The sugar-insensitive1 (sis1) Mutant of Arabidopsis Is Allelic to ctr1

Gibson, Susan I.; Laby, Ron J.; Kim, Donggiun

doi:10.1006/bbrc.2000.4062

Cited by 133 publications

(131 citation statements)

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“…A similar window has been described for sugar sensitivity of seedling growth (Gibson et al, 2001). Because sugar-induced developmental arrest is slightly dependent on ABI5 function, the window of sugar sensitivity might reflect a limited period of sugar-responsive ABI5 expression.…”

Section: Developmental and Environmental Regulation Of Abi5 Expressionmentioning

confidence: 54%

Regulation and Role of the ArabidopsisAbscisic Acid-Insensitive 5Gene in Abscisic Acid, Sugar, and Stress Response

2002

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Abscisic acid (ABA) and stress response from late embryonic growth through early seedling development is regulated by a signaling network that includes the Arabidopsis ABA-insensitive (ABI)5 gene, which encodes a basic leucine zipper transcription factor. We have characterized genetic, developmental, and environmental regulation of ABI5 expression. Although expressed most strongly in seeds, the ABI5 promoter is also active in vegetative and floral tissue. Vegetative expression is strongly induced by ABA, and weakly by stress treatments during a limited developmental window up to approximately 2 d post-stratification, but ABA and some stresses can induce expression in specific tissues at later stages. ABI5 expression is autoregulated in transgenic plants and yeast (Saccharomyces cerevisiae), and stress response appears to involve ABI5-dependent and -independent mechanisms. To determine whether ABI5 is necessary and/or sufficient for ABA or stress response, we assayed the effects of increased ABI5 expression on growth and gene expression. Although overexpression of ABI5 confers hypersensitivity to ABA and sugar, as previously described for ABI4 and ABI3 overexpression lines, it has relatively limited effects on enhancing ABA-responsive gene expression. Comparison of expression of eight ABI5-homologous genes shows overlapping regulation by ABI3, ABI4, and ABI5, suggestive of a combinatorial network involving positive and negative regulatory interactions.The phytohormone abscisic acid (ABA) regulates many agronomically important aspects of plant growth and development, including seed maturation, dormancy, stress tolerances, and water relations (for review, see Leung and Giraudat, 1998; Rock, 2000;. All of these processes are regulated by additional signals, including other phytohormones, stage-specific regulators, and abiotic stresses. Studies of ABA-deficient mutants have shown that ABA is an essential mediator in triggering some plant responses to abiotic stresses, including drought, salinity, and cold (Rock, 2000; Shinozaki and Yamaguchi-Shinozaki, 2000; Xiong and Zhu, 2001). Dehydration and low temperatures result in elevated levels of ABA, which, in turn, trigger the synthesis of some proteins responsible for drought or freezing tolerance. However, although most of the drought-and salt-induced genes studied to date can be induced by ABA, many aspects of stress response are also mediated by ABA-independent mechanisms (Shinozaki and Yamaguchi-Shinozaki, 2000). These results indicate that ABA participates in only part of a network of stress-signaling mechanisms. Furthermore, even the ABA-dependent portions of this network rely on both independent and partially redundant signaling components, some of which are produced only in specific developmental stages or tissues of the plant.Components of this signaling network have been identified by a combination of biochemical, cell biological, and forward and reverse genetic approaches. To date, nearly 50 loci in Arabidopsis alone have been demonstrated to function in v...

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Section: Developmental and Environmental Regulation Of Abi5 Expressionmentioning

confidence: 54%

Regulation and Role of the ArabidopsisAbscisic Acid-Insensitive 5Gene in Abscisic Acid, Sugar, and Stress Response

2002

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“…Similar effect is caused by glucose which inhibits germination of seeds of Arabidopsis, delays seedling development and significantly hinders mobilization of the main storage compound, i.e. lipid (Gibson et al 2001;To et al 2002). Moreover, the effect of glucose is not due to osmotic stress .…”

Section: Discussionmentioning

confidence: 92%

Regulation by sucrose of storage compounds breakdown in germinating seeds of yellow lupine (Lupinus luteus L.), white lupine (Lupinus albus L.) and Andean lupine (Lupinus mutabilis Sweet): I. Mobilization of storage protein

Borek

Kubala

2011

Acta Physiol Plant

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Research of the regulatory function of sucrose in storage protein breakdown was conducted on isolated embryo axes, excised cotyledons and whole seedlings of three lupine species grown in vitro on medium with 60 mM sucrose or without the sugar. Sucrose stimulated growth of yellow, white and Andean lupine isolated embryo axes and cotyledons but growth of seedlings was inhibited. Dry matter content was higher in sucrose-fed isolated organs and in seedling organs. Ultrastructure research revealed that lack of sucrose in the medium caused enhancement in storage protein breakdown. Protein deposits in cotyledons were smaller as well as soluble portion content in all studied organs was lower when there was no sucrose in the medium. In the same conditions, the activity of glutamate dehydrogenase was significantly higher. Increase in vacuolization of cells of white lupine root meristematic zone cells was observed and induction of autophagy in young carbohydrate-starved embryo axes is discussed.

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“…Anthocyanin accumulation was increased in the petals of tobacco plants over-expressing the mutated ethylene receptor gene, ethylene response 1 (ETR1H69A) (Takada et al, 2005). In contrast, constitutive triple response (ctr1) mutants grown in the presence of high levels of Suc had similar levels of anthocyanin than wild-type plants (Gibson et al, 2001).…”

Section: Interaction Of Sugar With Ethylenementioning

confidence: 99%