5 edition of Function of Specific Genes to Enhance Tolerance to Oxygen found in the catalog.
January 1, 1989
Written in English
|Series||Life Chemistry Reports Series|
|The Physical Object|
|Number of Pages||48|
The limited success to date of transgenic manipulations to increase ion exclusion, for example using the HKT gene family, is more likely to be due to the inability to express important exclusion genes in a cell type specific manner rather than a reflection of either the candidate gene or the effectiveness of the tolerance mechanism. One survival strategy employs constitutive morphological features or respective acclimative changes that improve the supply of oxygen to flooded organs. A second suite of mechanisms discussed in this chapter concerns metabolic adjustments that enable tolerance of the negative consequences associated with low oxygen supply.
Plant specific NAC (NAM, ATAF1/2 and CUC2) transcription factors (TFs) play important roles in response to abiotic stress. In this study, we identified and characterized a NAC protein, ThNAC7, from Tamarix hispida. ThNAC7 is a nuclear localized protein and has transcriptional activation activity. ThNAC7 expression was markedly induced by salt and osmotic stresses. Next, we used the GUS reporter to determine the tissue-specific expression pattern of CYCH; 2,bp promoter region of CYCH;1 was used to drive the expression of the GUS (uidA) gene in transgenic Arabidopsis activity was detected mainly in the vascular tissues of young leaves and stems (Fig. 1B, top) and in the stigma apex (Fig. 1B, middle).
Other TFs reported to play a role in the response to low oxygen in Arabidopsis are the NAC protein, ANAC, which activates a seed‐specific subset of genes during germination under oxygen limitations (Bond et al., ), and VIN3 (Vernalization‐Independent 3), which mediates chromatin rearrangements required for plant survival. Soil salinity is widespread in rice-producing areas globally, restricting both vegetative growth and grain yield. Improving salt tolerance of rice is a promising approach to meet the increasing food demand. An extensive literature survey indicates that maintaining proper Na+/K+ ratio and reactive oxygen species (ROS) content is the key issues for rice adaption to salt stress.
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The gene tagged by the DsE in ETR appears to be calcium‐regulated and required for low‐oxygen tolerance. ADH specific activity in GTR (unknown Ser/Pro rich protein), ETR (pectin methylesterase) and ETR (unknown) homozygotes was abnormally high after 12 h of oxygen deprivation and low after 24 h (Table 4), providing evidence that ADH expression may be both Cited by: Many attempts aiming to increase the tolerance of plants to environmental stresses using antioxidant genes have been made by researchers.
However, due to the great complexity of the antioxidant system and plant stress tolerance, we cannot state that ROS scavenging is the only factor that determines the level of tolerance, because other factors Cited by: Oxygen limitation, the predominant stress in flooded plants, dramatically affects the gene expression, development and productivity of maize.
Serious efforts are being made to improve flooding-tolerance of the crop across the globe. Here, we present an overview of gene expression changes in response to oxygen by: 4.
Because the increase in mannitol content was insufficient to account for osmotic adjustments in transgenic wheat plants expressing the Escherichia coli mannitol biosynthetic gene mtlD during drought and salinity, mannitol function in enhancing stress tolerance in these plants was mainly attributed to its potential for scavenging of HO and O 2 Cited by: OsMIOX, a myo-inositol oxygenase gene, improves drought tolerance through scavenging of reactive oxygen species in rice (Oryza sativa L.) JunzhiDuana1 MinghuiZhanga1 HongliangZhanga Haiyan Xionga PengliLiua JauharAlib JinjieLia ZichaoLia Get rights and contentCited by: Request PDF | Responses to Oxygen Deprivation and Potential for Enhanced Flooding Tolerance in Maize | Although plants release oxygen as a byproduct during the process of photosynthesis, they are.
A drought tolerance gene PtrWRKY75 was isolated from Populus trichocarpa. PtrWRKY75 was localized to the nucleus and bound to the PHENYLALANINE AMMONIA LYASE 1 (PAL1) promoter. PtrWRKY75 induced SA biosynthesis to increase ROS accumulation, leading to smaller stomatal aperture under drought stress.
Overexpression PtrWRKY75 improves drought tolerance. The expression of reactive oxygen species (ROS) signaling-related genes associated with high-salinity tolerance was upregulated by ethanol under salt stress condition. Some of these genes encode. Previous studies have reported that enhanced expression of stress-responsive genes such as COR15A, KIN1, RD29B, AIA1,HIS or overexpression of transcription factor genes such as MYB2, CBF1, CBF2, AZF2 imparts tolerance to low temperature and water stress in plants (Abe et al.
; Gilmour et al. ; Sakamoto et al. specific function and its activity should be assigned to a need to begin to introduce stress tolerance genes in crop plants. improve the tolerance of crops to a biotic stresses. Identification of stress-specific gene expression can provide important insights into the metabolic adaptations that are needed for anoxia tolerance, with potential applications to anoxia-intolerant systems.
Various methods are available to do this, including high throughput microarray screening and construction and screening of cDNA libraries.
MTs are low-molecularweight, cysteine-rich proteins that have high affinity for binding metal cations, and their overexpression can increase plant tolerance to specific metals (Fernandez et al.
Tolerance to submergence and low oxygen availability (hypoxia) have been considered to be influenced by different members of subgroup VII. HSFA4, a class A HSF, is found in a variety of plant species and confers tolerance to certain environmental stresses.
For example, estradiol-dependent induction of Arabidopsis AtHSFA4aconfers enhanced tolerance to salt and oxidative stress by interacting with MPK3/MPK6 signaling (Pérez-Salamó et al., ).
Oxygen (O 2) is essential for aerobic life; however, the level of O 2, whether too low (hypoxia) or too high (hyperoxia), can induce oxidative injury and increase morbidity and tion of O 2 homeostasis represents a major aspect of many disease etiologies and pathobiology.
In the past, our laboratory has been using Drosophila melanogaster to investigate the cellular and molecular. Gain- and loss-of-function mutations in Zat10 enhance the tolerance of plants to abiotic stress. FEBS Lett. – /t [PMC free article] [Google Scholar] Mittler R., Vanderauwera S., Gollery M., Van Breusegem F.
Reactive oxygen gene. High-throughput technology has facilitated genome-scale analyses of transcriptomic adjustments in response to environmental perturbations with an oxygen deprivation component, such as transient hypoxia or anoxia, root waterlogging, or complete submergence.
In the list of differentially expressed genes, there was a bias toward the low-oxygen library; 13% of the clones from the low-oxygen library were expressed differentially compared with 6% of the set of genes on the gene array. This implies that a specific subset of genes is activated under low-oxygen.
We manipulated the enzyme activity levels of the alcohol fermentation pathway, pyruvate decarboxylase (PDC), and alcohol dehydrogenase (ADH) in Arabidopsis using sense and antisense overexpression of the corresponding genes (PDC1, PDC2, and ADH1).
Transgenic plants were analyzed for levels of fermentation and evaluated for changes in hypoxic survival. The T. hispida transient overexpression and RNAi-silenced of ThCRF1 were generated to characteried the function of ThCRF ThCRF1 improves tolerance to salt-shock-induced stress by increased trehalose and proline level and enhanced activities of SOD and POD.
• ThCRF1 binds to GCC-box, DRE and TTG to regulate the gene expression to improve tolerance to salt-shock-induced stress. Dissolved oxygen in seawater is absorbed from the atmosphere and is a byproduct of photosynthesis.
As a result, most oxygen-rich water is found near the surface in the sunlit (also called the photic and epipelagic) zone, which where all plants and most marine organisms live (Costello and Chaudhary, ).Dissolved oxygen has a strong relationship with temperature (Garcia et al., ; Table 3.The Plant Physiology Special Issue on Reactive Oxygen Species (ROS) published in June marked the early efforts to resolve the tapestry of mechanisms influenced by ephemeral singlet oxygen, superoxide (O2.−), hydrogen peroxide (H2O2), hydroxyl radical (OH.), peroxynitrite (ONOO−), and nitric.Cold temperatures restrict plant growth, geographical extension of plant species, and agricultural practices.
This review deals with cold stress above freezing temperatures often defined as chilling stress. It focuses on the redox regulatory network of the cell under cold temperature conditions.
Reactive oxygen species (ROS) function as the final electron sink in this network which consists of.