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- 저자 : Yanxiu Zhao (검색결과 4 건)
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Expression of Yeast YAP1 in Transgenic Arabidopsis Results in Increased Salt Tolerance
Jiqiang Zhao,Shanli Guo,Shihua Chen,Hui Zhang,Yanxiu Zhao 한국식물학회 2009 Journal of Plant Biology Vol.52 No.1
Soil salinity is a major abiotic stress that lowers agricultural production around the world. Mainly caused by elevated levels of NaCl, it induces a wide range of responses in plants. In addition to ion toxicity, high salt levels can induce oxidative stress with the formation and accumulation of reactive oxygen species (ROS). We introduced the transcription factor YAP1, originally from yeast (Saccharomyces cerevisiae), into Arabidopsis thaliana (ecotype Columbia). When treated with various NaCl concentrations, transgenic plants showed increased activities of antioxidant enzymes catalase, superoxide dismutase, ascorbate peroxidase, peroxidase, glutathione S-transferase, and glutathione reductase compared with the wild-type Arabidopsis. This demonstrated that an active oxygen scavenging system was enhanced to protect plants from salt stress by equilibrating ROS metabolism. Transgenic Arabidopsis maintained higher photosynthesis levels and lower amounts of H2O2, suggesting that ROS production was reduced. Physiological analysis implied that transgenic Arabidopsis might employ multiple mechanisms to improve its salt tolerance.
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Jian He,Hu Li,Yanxiu Liu,Wenfeng Zhao,Tingting Yang,Wei Xue,Song Yang 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.43 No.-
A series of mesoporous acid–base bifunctional Zr/B mixed oxides with different molar ratios wereprepared by a sol–gel method, and developed for conversion of ethyl levulinate (EL) to g-valerolactone(GVL) by using alcohol as hydrogen source. The morphological structures and physico-chemicalcharacteristics of the synthesized materials were identified by various techniques. A high GVL yield of88.5% was achieved from EL in 2-propanol when Zr1B1 was used. And acid–base sites played a synergicrole in synthesizing GVL from EL as evident by poisoning experiments. Furthermore, the catalyst could bereused several times without significant loss of its catalytic activity.
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Weihuan Li,Quan Zhang,Xiangqiang Kong,Chunxia Wu,Xiuling Ma,Hui Zhang,Yanxiu Zhao 한국식물학회 2009 Journal of Plant Biology Vol.52 No.2
Vacuolar Na+/H+ antiporters catalyze the exchange of Na+ for H+ across vacuolar membranes and compartmentalize Na+ into vacuoles. They play important roles in cellular pH and Na+ homeostasis. The SsNHX1 gene was previously cloned from a typical euhalophyte, Suaeda salsa. Its cloning revealed another N-terminus truncated transcript, SsNHX2. This potentially alternative splicing variant was truncated from the 49 amino acid residues (aa) of the N terminus of SsNHX1. To compare their degree of salt tolerance, we over-expressed SsNHX1 and SsNHX2 in Arabidopsis. Southern and northern blot analyses showed that both genes had been integrated into that genome and had expressed in several lines. Two types of transgenic plants grew more vigorously than the wild type (WT) under salt stress, but no remarkable differences were found between those SsNHX1 and SsNHX2 transformants. Physiological analyses also supported this phenotype. Both fresh and dry weights of the transgenics as well as their accumulations of Na+ and K+ under salinity were much higher than that of WT, but differences were not significant between SsNHX1 and SsNHX2 plants for any of those parameters. These results suggest that SsNHX2 is a functional Na+/H+ antiporter like SsNHX1 and their levels of salt tolerance are similar.
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Loss of halophytism by interference with SOS1 expression.
Oh, Dong-Ha,Leidi, Eduardo,Zhang, Quan,Hwang, Sung-Min,Li, Youzhi,Quintero, Francisco J,Jiang, Xingyu,D'Urzo, Matilde Paino,Lee, Sang Yeol,Zhao, Yanxiu,Bahk, Jeong Dong,Bressan, Ray A,Yun, Dae-Jin,Par American Society of Plant Physiologists 2009 Plant Physiology Vol.151 No.1
<P>The contribution of SOS1 (for Salt Overly Sensitive 1), encoding a sodium/proton antiporter, to plant salinity tolerance was analyzed in wild-type and RNA interference (RNAi) lines of the halophytic Arabidopsis (Arabidopsis thaliana)-relative Thellungiella salsuginea. Under all conditions, SOS1 mRNA abundance was higher in Thellungiella than in Arabidopsis. Ectopic expression of the Thellungiella homolog ThSOS1 suppressed the salt-sensitive phenotype of a Saccharomyces cerevisiae strain lacking sodium ion (Na(+)) efflux transporters and increased salt tolerance of wild-type Arabidopsis. thsos1-RNAi lines of Thellungiella were highly salt sensitive. A representative line, thsos1-4, showed faster Na(+) accumulation, more severe water loss in shoots under salt stress, and slower removal of Na(+) from the root after removal of stress compared with the wild type. thsos1-4 showed drastically higher sodium-specific fluorescence visualized by CoroNa-Green, a sodium-specific fluorophore, than the wild type, inhibition of endocytosis in root tip cells, and cell death in the adjacent elongation zone. After prolonged stress, Na(+) accumulated inside the pericycle in thsos1-4, while sodium was confined in vacuoles of epidermis and cortex cells in the wild type. RNAi-based interference of SOS1 caused cell death in the root elongation zone, accompanied by fragmentation of vacuoles, inhibition of endocytosis, and apoplastic sodium influx into the stele and hence the shoot. Reduction in SOS1 expression changed Thellungiella that normally can grow in seawater-strength sodium chloride solutions into a plant as sensitive to Na(+) as Arabidopsis.</P>
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