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Jining, China

Ren Q.,China Agricultural University | Ren Q.,Jining Normal College | Cao L.-Z.,China Agricultural University | Su J.-W.,CAS Institute of Zoology | And 3 more authors.
Weed Science | Year: 2010

The volatile compounds of crofton weed infested by cotton aphids and sprayed with MeJA were collected and analyzed by the TCT-GC/MS technique. The healthy weeds were controls. Seventeen volatiles identified from crofton weed included green leaf odors, monoterpenes and sequiterpenes, and oxo-compounds. Camphene, 2-carene, α-phellandrene, ρ-cymene, and caryophyllene were the major volatiles and constituted about 77 of the total volatile emissions from the control. In the aphid-infested weeds, no new induced component was found. Among the terpenes, ρ-cymene increased markedly in the infested weeds compared with the control, whereas all sesquiterpenes decreased markedly. Levels of endogenous JA in leaves and young stems of the aphid-infested weeds were markedly higher than in the control, whereas both endogenous SA level and ABA level were not significantly different. MeJA sprayed on crofton weed with the aphid infestation had a similar effect on volatile emissions. It is suggested that JA was one of the most important signals in crofton weed and could regulate the emission of volatile compounds. © 2010 Weed Science Society of America.

Guo H.,CAS Institute of Zoology | Guo H.,University of Chinese Academy of Sciences | Sun Y.,CAS Institute of Zoology | Ren Q.,Jining Normal College | And 5 more authors.
PLoS ONE | Year: 2012

Both resistance and tolerance, which are two strategies that plants use to limit biotic stress, are affected by the abiotic environment including atmospheric CO2 levels. We tested the hypothesis that elevated CO2 would reduce resistance (i.e., the ability to prevent damage) but enhance tolerance (i.e., the ability to regrow and compensate for damage after the damage has occurred) of tomato plants to the cotton bollworm, Helicoverpa armigera. The results showed that elevated CO2 reduced resistance by decreasing the jasmonic acid (JA) level and activities of lipoxygenase, proteinase inhibitors, and polyphenol oxidase in wild-type (WT) plants infested with H. armigera. Consequently, the activities of total protease, trypsin-like enzymes, and weak and active alkaline trypsin-like enzymes increased in the midgut of H. armigera when fed on WT plants grown under elevated CO2. Unexpectedly, the tolerance of the WT to H. armigera (in terms of photosynthetic rate, activity of sucrose phosphate synthases, flower number, and plant biomass and height) was also reduced by elevated CO2. Under ambient CO2, the expression of resistance and tolerance to H. armigera was much greater in wild type than in spr2 (a JA-deficient genotype) plants, but elevated CO2 reduced these differences of the resistance and tolerance between WT and spr2 plants. The results suggest that the JA signaling pathway contributes to both plant resistance and tolerance to herbivorous insects and that by suppressing the JA signaling pathway, elevated CO2 will simultaneously reduce the resistance and tolerance of tomato plants. © 2012 Guo et al.

Xing D.,Jining Normal College | Yang H.,Inner Mongolia Normal University | Cao Y.,Inner Mongolia Normal University
Journal of Magnetism and Magnetic Materials | Year: 2015

The waveguide properties of spin waves through line defects in two-dimensional magnonic crystals are investigated by numerical calculating band structures and magnetization-field distributions of the defect modes. The results show that the spin waves are very well localized in the line defects, and the size of the defect bodies has an obvious influence on the defect modes existing in the frequency regime of the gap. It will provide us a theoretical foundation in the designing of spin-wave waveguides with different shapes. © Elsevier B.V. All rights reserved.

Wei J.,CAS Institute of Zoology | Yan L.,CAS Institute of Genetics and Developmental Biology | Ren Q.,CAS Institute of Zoology | Ren Q.,Jining Normal College | And 3 more authors.
Plant, Cell and Environment | Year: 2013

We used tomato genotypes deficient in the jasmonic acid (JA) pathway to study the interaction between the production of herbivore-induced plant volatiles (HIPVs) that serve as information cues for herbivores as well as natural enemies of herbivores, and the production of foliar trichomes as defence barriers. We found that jasmonic acid-insensitive1 (jai1) mutant plants with both reduced HIPVs and trichome production received higher oviposition of adult leafminers, which were more likely to be parasitized by the leafminer parasitoids than JA biosynthesis spr2 mutant plants deficient in HIPVs but not trichomes. We also showed that the preference and acceptance of leafminers and parasitoids to trichome-removed plants from either spr2 or wild-type (WT) genotypes over trichome-intact genotypes can be ascribed to the reduced trichomes on treated plants, but not to altered direct and indirect defence traits such as JA, proteinase inhibitor (PI)-II and HIPVs levels. Although the HIPVs of WT plants were more attractive to adult insects, the insects preferred trichome-free jai1 plants for oviposition and also had greater reproductive success on these plants. Our results provide strong evidence that antagonism between HIPV emission and trichome production affects tritrophic interactions. The interactions among defence traits are discussed. © 2012 Blackwell Publishing Ltd.

Yang H.-W.,Inner Mongolia Normal University | Wu Y.-L.,Jining Normal College | Ma X.-Y.,Inner Mongolia Normal University
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2015

The distribution characteristics and correlation analysis of Fe speciation in the surface sediments from different reaches along Yellow River have been analyzed utilizing the so-called sequential extraction approach. The results indicate that the concentration of total iron (∑Fe) in the surface sediments is in the range from 14.01 g/kg to 30.98 g/kg, Liulin (H13) sample is the maximum and Bohai offshore (H21) sample is the minimum. The residue iron(Fe-6)-the highest concentration in all speciations with 92.55%~98.4% of ∑Fe, and the bio-available fraction iron (BFe) only for 1.56%~6.98% with remarkably positive correlation with ∑Fe, the change trades of BFe, Fe-6 and ∑Fe concentrations are consistency along main stream of the Yellow River. The organic matter (OM) shows a notable correlation with both BFe and Fe-Mn oxides (Fe-4), while BFe has extremely positive correlation with Fe-4, indicating that the content of BFe mainly relies on the Fe-4 and the organic matter. When the concentration of total particulate matter (TPM) is increased in the water of the Yellow River, such as in the middle reaches of the Yellow River Dayudu segments (H15) and Sanmenxia segments (H17), one can find the high concentration of ∑Fe and Fe-1 in the surface sediments, when the concentration of TPM decrease, such as in the upper reaches of the Yellow River Wuhai segments (H7) and Sanshenggong segments (H8), the concentration of ∑Fe and Fe-1 in the surface sediments is low. The results indicate that the artificial dams in the Yellow River Basin cause the changes of TPM concentration in the water, and also lead to non negligible impact on the iron cycle in the Yellow River. © 2015, Chinese Society for Environmental Sciences. All right reserved.

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