| 1. |
- Ahmed, Mukhtar
(författare)
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Hydrogen Sulfide: A Novel Gaseous Molecule for Plant Adaptation to Stress
- 2021
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Ingår i: Journal of Plant Growth Regulation. - : Springer Science and Business Media LLC. - 0721-7595 .- 1435-8107.
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Forskningsöversikt (refereegranskat)abstract
- Hydrogen sulfide (H2S) has emerged as a novel gaseous signal molecule with multifarious effects on seed germination, plant growth, development, and physiological processes. Due to its dominant role in plant stress tolerance and cross-adaptation, it is getting more attention nowadays, although it has been largely referred as toxic and environmental hazardous gas. In this review work, we are highlighting the importance of H2S as an essential gaseous molecule to help in signaling, metabolism, and stress tolerance in plants. Firstly, production of H2S from different natural and artificial sources were discussed with its transformation from sulfur (S) to sulfate (SO42-) and then to sulfite (SO32-). The importance of different kinds of transporters that helps to take SO42- from the soil solution was presented. Mainly, these transporters are SULTRs (H+/SO42- cotransporters) and multigene family encodes them. Furthermore, these SULTRs have LAST (Low affinity transport proteins), HAST (High affinity transport proteins), vacuole transporters, and plastid transporters. Since it is well known that there is strong relationship between SO42- and synthesis of hydrogen sulfide or dihydrogen sulfide or sulfane in plant cells. Thus, cysteine (Cys) metabolism through which H2S could be generated in plant cell with the role of different enzymes has been presented. Furthermore, H2S in interaction with other molecules could help to mitigate biotic and abiotic stress. Based on this review work, it can be concluded that H2S has potential to induce cross-adaptation to biotic and abiotic stress; thus, it is recommended that it should be considered in future studies to answer the questions like what are the receptors of H2S in plant cell, where in plants the physiological concentration of H2S is high in response to multiple stress and how it induces cross-adaptation by interaction with other signal molecules.
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| 2. |
- Heisler, Marcus, et al.
(författare)
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Computer modeling of plant development
- 2006
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Ingår i: Journal of Plant Growth Regulation. - : Springer Science and Business Media LLC. - 0721-7595 .- 1435-8107. ; 25, s. 267-269
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Tidskriftsartikel (refereegranskat)
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| 3. |
- Heisler, Marcus, et al.
(författare)
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Modeling auxin transport and plant development
- 2006
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Ingår i: Journal of Plant Growth Regulation. - : Springer Science and Business Media LLC. - 0721-7595 .- 1435-8107. ; 25, s. 302-312
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Tidskriftsartikel (refereegranskat)abstract
- The plant hormone auxin plays a critical role in plant development. Central to its function is its distribution in plant tissues, which is, in turn, largely shaped by intercellular polar transport processes. Auxin transport relies on diffusive uptake as well as carrier-mediated transport via influx and efflux carriers. Mathematical models have been used to both refine our theoretical understanding of these processes and to test new hypotheses regarding the localization of efflux carriers to understand auxin patterning at the tissue level. Here we review models for auxin transport and how they have been applied to patterning processes, including the elaboration of plant vasculature and primordium positioning. Second, we investigate the possible role of auxin influx carriers such as AUX1 in patterning auxin in the shoot meristem. We find that AUX1 and its relatives are likely to play a crucial role in maintaining high auxin levels in the meristem epidermis. We also show that auxin influx carriers may play an important role in stabilizing auxin distribution patterns generated by auxin-gradient type models for phyllotaxis.
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| 4. |
- Meijer, Johan, et al.
(författare)
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Control of Drought Stress in Wheat Using Plant-Growth-Promoting Bacteria
- 2013
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Ingår i: Journal of Plant Growth Regulation. - : Springer Science and Business Media LLC. - 0721-7595 .- 1435-8107. ; 32, s. 122-130
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Tidskriftsartikel (refereegranskat)abstract
- Abiotic stress conditions are the main limiting factors for crop cultivation around the world. In the present study we aimed to improve wheat growth under drought stress conditions through priming with beneficial bacteria considered as plant-growth promoting bacteria (PGPB). Two bacterial strains, Bacillus amyloliquefaciens 5113 and Azospirillum brasilense NO40, were used to prime the wheat cv. Sids1. To generate drought stress for 12-day-old seedlings, water was withheld for 4, 5, or 7 days while growth and survival were recorded. Furthermore, several stress markers were examined by molecular and biochemical assays to study the role of priming on different stress tolerance mechanisms. Priming significantly alleviated the deleterious effect of drought stress on wheat. Drought resulted in the upregulation of some stress-related genes (APX1, SAMS1, and HSP17.8) in the leaves and increased activity of enzymes involved in the plant ascorbate-glutathione redox cycle. Bacteria-treated plants showed attenuated transcript levels suggesting improved homeostatic mechanisms due to priming. The present study reports on the ability of certain PGPB to attenuate several stress consequences in plants which strongly supports the potential of such an approach to control drought stress in wheat.
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| 5. |
- Sivan, Pramod, 1984-, et al.
(författare)
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Effect of Exogenously Applied 24-Epibrassinolide and Brassinazole on Xylogenesis and Microdistribution of Cell Wall Polymers in Leucaena leucocephala (Lam) De Wit
- 2021
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Ingår i: Journal of Plant Growth Regulation. - : Springer Nature. - 0721-7595 .- 1435-8107. ; 41:1, s. 404-416
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Tidskriftsartikel (refereegranskat)abstract
- Plant growth regulators play a key role in cell wall structure and chemistry of woody plants. Understanding of these regulatory signals is important in advanced research on wood quality improvement in trees. The present study is aimed to investigate the influence of exogenous application of 24-epibrassinolide (EBR) and brassinosteroid inhibitor, brassinazole (BRZ) on wood formation and spatial distribution of cell wall polymers in the xylem tissue of Leucaena leucocephala using light and immuno electron microscopy methods. Brassinazole caused a decrease in cambial activity, xylem differentiation, length and width of fibres, vessel element width and radial extent of xylem suggesting brassinosteroid inhibition has a concomitant impact on cell elongation, expansion and secondary wall deposition. Histochemical studies of 24-epibrassinolide treated plants showed an increase in syringyl lignin content in the xylem cell walls. Fluorescence microscopy and transmission electron microscopy studies revealed the inhomogenous pattern of lignin distribution in the cell corners and middle lamellae region of BRZ treated plants. Immunolocalization studies using LM10 and LM 11 antibodies have shown a drastic change in the micro-distribution pattern of less substituted and highly substituted xylans in the xylem fibres of plants treated with EBR and BRZ. In conclusion, present study demonstrates an important role of brassinosteroid in plant development through regulating xylogenesis and cell wall chemistry in higher plants.
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