Adaptive Alterations in the Ultrastructure of Chloroplasts and the Contents of Pigments and Sugars under Low Temperature Hardening of Potato Plants: Role of Δ12 Acyl-Lipid Desaturase

2018 ◽  
Vol 45 (6) ◽  
pp. 549-556 ◽  
Author(s):  
N. V. Naraikina ◽  
N. V. Astakhova ◽  
A. N. Deryabin ◽  
M. S. Sinkevich ◽  
T. I. Trunova
Keyword(s):  
Low Temperature ◽  
Potato Plants ◽  
Acyl Lipid ◽  
Temperature Hardening

Overexpression of the acyl-lipid Δ12-desaturase gene protects potato plants from low temperature damage

2011 ◽  
Vol 59 (2) ◽  
pp. 103-115 ◽  
Author(s):  
I. Demin ◽  
C. Shimshilashvili ◽  
N. Yur’eva ◽  
N. Naraykina ◽  
I. Goldenkova-Pavlova ◽  
...  
Keyword(s):  
Lipid Peroxidation ◽  
Low Temperature ◽  
Cold Stress ◽  
Malonic Dialdehyde ◽  
Plant Leaves ◽  
Desaturase Gene ◽  
Potato Plants ◽  
Acyl Lipid ◽  
Temperature Damage ◽  
Δ12 Desaturase

The responses of plant leaves to chilling were studied in potato (Solanum tuberosum L., cv. Desnitsa) and in its transformants with the native desA gene that encodes the acyl-lipid Δ12-desaturase from the cyanobacterium Synechocystis sp. PCC 6803 and with the hybrid desA gene fused to the reporter gene of thermostable lichenase (licBM3) from Clostridium thermocellum. Cold stress caused a rapid and significant increase in superoxide production and lipid peroxidation (the content of conjugated dienes and malonic dialdehyde) in wild-type plants. By contrast no significant increase was detected in transformed plants under cold stress conditions. This can be attributed to the fact that the overexpression of the acyl-lipid Δ12-desaturase in transformed potato plants promotes fatty acid polyunsaturation and presumably averts the accelerated generation of the superoxide anion, thus suppressing lipid peroxidation under low-temperature stress

scholarly journals Dissecting the Roles of Cuticular Wax in Plant Resistance to Shoot Dehydration and Low-Temperature Stress in Arabidopsis

2021 ◽  
Vol 22 (4) ◽  
pp. 1554
Author(s):  
Tawhidur Rahman ◽  
Mingxuan Shao ◽  
Shankar Pahari ◽  
Prakash Venglat ◽  
Raju Soolanayakanahally ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Low Temperature ◽  
Cold Acclimation ◽  
Water Loss ◽  
Cuticular Wax ◽  
Dehydration Stress ◽  
Wax Deposition ◽  
Cuticular Waxes ◽  
Gas Chromatography Mass Spectroscopy

Cuticular waxes are a mixture of hydrophobic very-long-chain fatty acids and their derivatives accumulated in the plant cuticle. Most studies define the role of cuticular wax largely based on reducing nonstomatal water loss. The present study investigated the role of cuticular wax in reducing both low-temperature and dehydration stress in plants using Arabidopsis thaliana mutants and transgenic genotypes altered in the formation of cuticular wax. cer3-6, a known Arabidopsis wax-deficient mutant (with distinct reduction in aldehydes, n-alkanes, secondary n-alcohols, and ketones compared to wild type (WT)), was most sensitive to water loss, while dewax, a known wax overproducer (greater alkanes and ketones compared to WT), was more resistant to dehydration compared to WT. Furthermore, cold-acclimated cer3-6 froze at warmer temperatures, while cold-acclimated dewax displayed freezing exotherms at colder temperatures compared to WT. Gas Chromatography-Mass Spectroscopy (GC-MS) analysis identified a characteristic decrease in the accumulation of certain waxes (e.g., alkanes, alcohols) in Arabidopsis cuticles under cold acclimation, which was additionally reduced in cer3-6. Conversely, the dewax mutant showed a greater ability to accumulate waxes under cold acclimation. Fourier Transform Infrared Spectroscopy (FTIR) also supported observations in cuticular wax deposition under cold acclimation. Our data indicate cuticular alkane waxes along with alcohols and fatty acids can facilitate avoidance of both ice formation and leaf water loss under dehydration stress and are promising genetic targets of interest.

The Role of Li2CO3and PbO in the Low-Temperature Sintering of Sr, K, Nb (SKN)-Doped PZT

2009 ◽  
Vol 92 (6) ◽  
pp. 1203-1207 ◽  
Author(s):  
Niall J. Donnelly ◽  
Thomas R. Shrout ◽  
Clive A. Randall
Keyword(s):  
Low Temperature ◽  
Low Temperature Sintering

Spin-Lattice Coupling and Peculiarities of Magnetic Behavior of Ferrimagnetic Ludwigites Mn0.52+M1.52+Mn3+BO5(M=Cu, Ni)

2015 ◽  
Vol 233-234 ◽  
pp. 133-136 ◽  
Author(s):  
Leonard Bezmaternykh ◽  
Evgeniya Moshkina ◽  
Evgeniy Eremin ◽  
Maxim Molokeev ◽  
Nikita Volkov ◽  
...  
Keyword(s):  
Temperature Field ◽  
Low Temperature ◽  
Magnetic Anisotropy ◽  
Single Crystals ◽  
Magnetic Behavior ◽  
Temperature Hysteresis ◽  
Spin Lattice ◽  
Field Magnetization ◽  
Lattice Coupling

Temperature-field and orientational magnetization dependences of single crystals were measured. Both samples demonstrate significant field-depending temperature hysteresis and low-temperature counter field magnetization. The correlation of orientational dependences of these effects and magnetic anisotropy is analyzed; the role of spin-lattice interactions is discussed.

Low-temperature specific heat of the Coulomb glass: Role of correlations

1996 ◽  
Vol 53 (24) ◽  
pp. 16197-16200 ◽  
Author(s):  
A. Möbius ◽  
M. Pollak
Keyword(s):  
Low Temperature ◽  
Specific Heat ◽  
Low Temperature Specific Heat ◽  
Coulomb Glass

Role of Surface Reconstruction and External Ion Beam in the Growth Kinetics of III-V Molecular Beam Epitaxy

1987 ◽  
Vol 94 ◽  
Author(s):  
S. B. Ogale ◽  
M. Thomsen ◽  
A. Madhukar
Keyword(s):  
Molecular Beam Epitaxy ◽  
Low Temperature ◽  
Surface Reconstruction ◽  
Molecular Beam ◽  
Ion Beam ◽  
Growth Front ◽  
Kinetic Rates ◽  
Kinetics Of ◽  
Low Temperature Epitaxy

ABSTRACTComputer simulations of III-V molecular beam epitaxy (MBE) show that surface reconstruction induced modulation of kinetic rates could give rise to ordering in alloys. Results are also presented for the possible influence of an external ion beam in achieving low temperature epitaxy as well as smoother growth front under usual conditions.

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