The Role of GIGANTEA Gene in Mediating the Oxidative Stress Response and in Arabidopsis

Cao, Shuqing; Jiang, Shaotong; Zhang, Rongxian

doi:10.1007/s10725-006-0012-8

Cited by 42 publications

(35 citation statements)

References 36 publications

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“…The study of pigweed on drought resistant is still at the initial stage. The coincidence of our results with the results of Cao et al (2006) and indicated that they may share the same signaling pathways of drought resistant mechanisms and this should be further examined.…”

Section: Resultssupporting

confidence: 74%

The effects of drought stress on the activity of acid phosphatase and its protective enzymes in pigweed leaves

Sun¹,

Wei²,

Xiang-ling³

et al. 2010

Afr. J. Biotechnol.

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A model of drought was created on pigweed and the effects of drought stress on the activity of acid phosphatase and its protective enzymes were examined. The pot-cultured pigweeds were divided into 4 groups (ten plants per group) when they reached 6 leaves. (1) In the control group, the culture media contained 70 -85% of field moisture capacity, (2) In the second group, the mild drought stress group, the culture media contained 50 -60% of field moisture capacity, (3) The moderate drought stress group had a culture media that contained 40 -50% of field moisture capacity; (4) The severe drought stress group culture media contained 30 -40% of field moisture capacity. All through the process of the present study, the pigweed plants were cultured under natural conditions on the rooftop of the laboratory building; though transferred indoor in rainy days to avoid the influence of natural precipitation. The plants were sampled and detected every five days after the administration of drought stress. The results clearly demonstrated that the drought stress significantly enhanced the activity of acid phosphatase, membrane permeability and MDA contents; though the activity of acid phosphatase declined after a certain time of drought stress, the extent of membrane permeability and MDA contents still increased with the time. The membrane permeability and MDA contents were correlated with a correlation coefficient of 0.963, 0.971 and 0.939 under mild, moderate and severe drought stress, respectively. The activity of superoxide dismutase (SOD), peroxide dismutase (POD) and hydrogen peroxidase (CAT) was also enhanced with increase in the intensity of drought stress or the prolongation of drought stress at first and then decreased some time afterwards. It was concluded that drought stress enhanced the activity of acid phosphatase, membrane permeability and MDA in the pigweed plants, which was able to resist a certain drought stress by enhancing the activity of protective enzymes. However, excessive drought stress markedly affected the metabolic systems of enzyme and decreased the activity of enzyme.

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Section: Resultssupporting

confidence: 74%

The effects of drought stress on the activity of acid phosphatase and its protective enzymes in pigweed leaves

Sun¹,

Wei²,

Xiang-ling³

et al. 2010

Afr. J. Biotechnol.

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show abstract

“…The oxidative-stress resistant phenotype observed by Kurepa et al 99 was partly explained by a constitutive higher expression of ascorbate peroxidase (APX1) and Cd/Zn and Fe superoxide dismutases (CSD2 and FeSOD, respectively). 100 Furthermore, when oxidative stress was created by methylviologen application, gi showed lower increase in H 2 O 2 and superoxide production compared to wild type, 99,101 as well as reduced lipid peroxidation. 100 However in both cases, the mechanism that leads to starch accumulation and oxidative stress resistance in gi is still unknown.…”

Section: Stress and Energy As A Metabolic Input To The Clockmentioning

confidence: 97%

“…100 Furthermore, when oxidative stress was created by methylviologen application, gi showed lower increase in H 2 O 2 and superoxide production compared to wild type, 99,101 as well as reduced lipid peroxidation. 100 However in both cases, the mechanism that leads to starch accumulation and oxidative stress resistance in gi is still unknown. Given the pleiotropy of gi phenotypes, one could speculate that either these are a consequence of the disruption of the clock in gi, or perhaps more likely that GI is involved in several protein complexes in different cellular compartments with different and distinct biochemical/enzymatic functions.…”

Section: Stress and Energy As A Metabolic Input To The Clockmentioning

confidence: 97%

Abiotic stress and the plant circadian clock

Sanchez

Shin²,

Davis

2011

Plant Signaling & Behavior

119

107

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“…Recently, GI has been implicated in cold (25), oxidative (26), drought (27), and salt (28) stress tolerance. Accordingly, we tested our panel of Arabidopsis gi-201 mutants carrying the B. rapa GI alleles for freezing tolerance, as measured by electrolyte leakage after exposure to freezing temperatures.…”

Section: Significancementioning

confidence: 99%

Allelic polymorphism of GIGANTEA is responsible for naturally occurring variation in circadian period in Brassica rapa

Xie

Lou

Hermand

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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GIGANTEA (GI) was originally identified by a late-flowering mutant in Arabidopsis, but subsequently has been shown to act in circadian period determination, light inhibition of hypocotyl elongation, and responses to multiple abiotic stresses, including tolerance to high salt and cold (freezing) temperature. Genetic mapping and analysis of families of heterogeneous inbred lines showed that natural variation in GI is responsible for a major quantitative trait locus in circadian period in Brassica rapa. We confirmed this conclusion by transgenic rescue of an Arabidopsis gi-201 loss of function mutant. The two B. rapa GI alleles each fully rescued the delayed flowering of Arabidopsis gi-201 but showed differential rescue of perturbations in red light inhibition of hypocotyl elongation and altered cold and salt tolerance. The B. rapa R500 GI allele, which failed to rescue the hypocotyl and abiotic stress phenotypes, disrupted circadian period determination in Arabidopsis. Analysis of chimeric B. rapa GI alleles identified the causal nucleotide polymorphism, which results in an amino acid substitution (S264A) between the two GI proteins. This polymorphism underlies variation in circadian period, cold and salt tolerance, and red light inhibition of hypocotyl elongation. Loss-of-function mutations of B. rapa GI confer delayed flowering, perturbed circadian rhythms in leaf movement, and increased freezing and increased salt tolerance, consistent with effects of similar mutations in Arabidopsis. Collectively, these data suggest that allelic variation of GI-and possibly of clock genes in general-offers an attractive target for molecular breeding for enhanced stress tolerance and potentially for improved crop yield.abiotic stress tolerance | circadian clock | hypocotyl elongation | flowering time | natural variation T he last half-century has seen dramatic increases in agricultural productivity. Despite the approximate doubling in world population since 1964, the proportion with insufficient food has dropped by ∼75%, although ∼1 billion remain underfed, and twice that many suffer from micronutrient deficiencies (1). Predicted growth in population and in per capita consumption will require an estimated doubling of crop production by 2050 (2). However, yield trends for maize, rice, wheat, and soybean-four major crops that currently produce nearly two-thirds of global agricultural calories-are insufficient to achieve this doubling (3). Therefore, there is a pressing need not simply to sustain, but actually to accelerate yield improvement.One strategy to increase yield is to identify genetic variation in plant regulatory networks that limit yield to define targets for programs of marker-assisted (molecular) breeding. The circadian clock has been implicated as a target for increasing yield (4-6). Plant circadian clocks comprise multiple interlocked feedback loops (7-9). There is natural variation in clock function in both weedy and cultivated species (10-15), although few of the genes responsible for these quantitative trait loc...

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The Role of GIGANTEA Gene in Mediating the Oxidative Stress Response and in Arabidopsis

Cited by 42 publications

References 36 publications

The effects of drought stress on the activity of acid phosphatase and its protective enzymes in pigweed leaves

The effects of drought stress on the activity of acid phosphatase and its protective enzymes in pigweed leaves

Abiotic stress and the plant circadian clock

Allelic polymorphism of GIGANTEA is responsible for naturally occurring variation in circadian period in Brassica rapa

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