Wyniki wyszukiwania

1

Genetic and environmental influence on the extract viscosity of winter rye

100%

Gan Y., McLeod J. G., Scoles G. J., Campbell G. L.

Plant Breeding and Seed Science

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1996

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tom 40

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nr 3-4

2

Extract viscosity of winter rye heritability and correlation to kernel characters

100%

Gan Y., McLeod J. G., Scoles G. J., Campbell G. L.

Plant Breeding and Seed Science

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1996

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tom 40

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nr 3-4

3

Biomass allocation, compensatory growth and internal C/N balance of Lolium perenne in response to defoliation and light treatments

88%

Wang L., Wang J., Liu W., Gan Y., Wu Y.

Polish Journal of Ecology

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2016

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tom 64

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nr 4

Light environments can have a considerable influence on how plants respond to defoliation through influencing the biomass allocation patterns and internal C/N ratio. Seedlings of Lolium perenne, a common perennial grass species, were grown for eight weeks under three different light environments (natural light, red light and shading) and two different defoliation treatments (no defoliation versus 50% aboveground biomass removal). This study was conducted to examine (1) the effects of light regimes and defoliation on biomass accumulation, biomass allocation and internal C/N ratio status in plants; (2) how the light regimes influence the pattern of compensatory growth after defoliation; and (3) the relationship between compensatory growth and the internal C/N ratio status. We found that red light altered the shoot-to-root allometry, enhanced the leaf C concentrations and induced N deficiency. By contrast, the leaf N concentrations of L. perenne were greater during shading treatment, which simultaneously enhanced shoot growth and stopped root growth. Under defoliation, red light increased shoot growth, not at the expense of root growth, which was not the same as in natural light and shading treatment. Moreover, regardless of the unclipped (no defoliation) and defoliation conditions, the L. perenne biomass partitioning between roots and shoots was significantly correlated with the leaf N concentrations and C/N ratio, indicating that allometric biomass allocation can be largely modulated by signals related to the C and N status of the plants. These results demonstrated that the leaf C and N status would be an appropriate indicator of compensatory growth after defoliation.

4

Brassinosteroid alleviates chilling-induced oxidative stress in pepper by enhancing antioxidation systems and maintenance of photosystem II

88%

Li J., Yang P., Gan Y., Yu J., Xie J.

Acta Physiologiae Plantarum

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2015

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tom 37

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nr 11

To explore regulated mechanisms of Brassinosteroids-induced chilling tolerance, we studied the involvement of foliar sprayed 24-epibrassinolide (EBR) in the growth, lipid peroxidation, distribution of absorbed energy and excitation energy, chlorophyll fluorescence characteristics and antioxidant defense system of pepper seedlings under chilling stress. We found that low temperature retarded the growth of pepper seedlings, but foliar spray of EBR solution markedly improved the photoinhibition by increasing maximum quantum efficiency of photosystem II (Fv/Fm), the actual photochemical efficiency of photosystem II, photochemical quenching coefficient and the efficiency of excitation capture of open PSII center (Fv'/Fm'). Likewise, EBR increased the fraction of photochemical efficiency (P) and reduced the fraction of antenna heat dissipation (D) and excess energy (E). Low temperature led the increase in end product of lipid peroxidation and the content of H2O2, O2 - and OH-, and it caused the occurrence of oxidative stress. The activities of antioxidative enzymes including superoxide dismutase, peroxidase, catalase and ascorbate peroxidase, and contents of ascorbic acid and reduced glutathione were significantly improved by EBR during low temperature stress. The application of EBR also markedly increased the contents of proline, soluble sugar and protein under low temperature. EBR significantly reinforced antioxidant defense system, and it can be reflected through the reduced accumulation of harmful reactive oxygen species and MDA in pepper seedlings. Overall, these results suggest that EBR increases the tolerance of pepper seedlings against chilling stress largely by optimizing distribution of absorbed energy and excitation energy and enhancing antioxidant defense system.

5

Effects of mismatches and insertions on discrimination accuracy of nucleic acid probes

88%

Piao X., Sun L., Zhang T., Gan Y., Guan Y.

Acta Biochimica Polonica

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2008

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tom 55

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nr 4

713-720

Effective discrimination of non-complementary nucleotides is an important factor to ensure the accuracy of hybridization-based nucleic acid analyses. The current study investigates the effects of the chemical nature, the positions, the numbers, and the cooperative behavior of mismatches as well as insertions on 20-mer and 30-mer duplexes. We observed the hybridization stability trend affected by mismatches: G:T ≈ G:G > G:A > A:A ≈ T:T > A:C ≈ T:C > C:C. The experimental data show that mismatches at the center of the oligonucleotide probes have a more profound destabilizing effect on the hybridization stability than those at either ends. Insertions also demonstrate a similar destabilizing effect as mismatches. These results provide useful information for designing DNA microarray nucleotide probes and for improving the discrimination accuracy of hybridization-based detections.

6

Effect of bisphenol A-induced oxidative stress on the ultra structure and antioxidant defence system of Arabidopsis thialiana leaves

52%

Ali I., Wakeel A., Upreti S., Liu D., Azizullah A., Jan M., Ullah W., Liu B., Ali A., Daud M. K., Gan Y.

Polish Journal of Environmental Studies

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2018

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tom 27

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nr 3

Bisphenol A (BPA) is an emerging environmental pollutant with potentially toxic effects on living organisms. The present study was undertaken to analyze the effects of BPA on the leaves of Arabidopsis thialina by determining the levels of photosynthetic pigments, reactive oxygen species (ROS), membrane lipid peroxidation, and ultrastructural malformation. The obtained results revealed that while a low dose of BPA (10μM) did not alter the test indices significantly, it did cause significant changes in all test indices at higher concentrations. Upon exposure to 40 μM BPA, chlorophyll a and chlorophyll b content showed a decrease of 33% and 30%, respectively. It significantly increased ROS contents and lipid peroxidation at 40 μM BPA exposure. Biochemical and gene expression analysis revealed that the antioxidant system was activated and mounted a defense against BPA-induced ROS. In the case of superoxide dismutase (SOD), 40 μM of BPA caused an increase of 151%. However, the malfunctioning of ascorbate peroxidase (APX) and catalase (CAT) at the highest dose of BPA (40 μM) resulted in incomplete activation of the antioxidant defensive system. BPA stress significantly altered the ultrastructure of cells as evidenced by the reduced number of starch grains, damaged chloroplast and mitochondria, and altered leaf epidermal surface, guard cells, and stomata. It is concluded that observed adverse effects in Arabidopsis leaves in response to BPA exposure could be attributed to BPA-induced oxidative stress.

Ograniczanie wyników

Genetic and environmental influence on the extract viscosity of winter rye

Extract viscosity of winter rye heritability and correlation to kernel characters

Biomass allocation, compensatory growth and internal C/N balance of Lolium perenne in response to defoliation and light treatments

Brassinosteroid alleviates chilling-induced oxidative stress in pepper by enhancing antioxidation systems and maintenance of photosystem II

Effects of mismatches and insertions on discrimination accuracy of nucleic acid probes

Effect of bisphenol A-induced oxidative stress on the ultra structure and antioxidant defence system of Arabidopsis thialiana leaves