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Wang C.,Northeast Forestry University | Zhang D.-W.,Jilin Provincial Academy of Forestry science | Wang Y.-C.,Northeast Forestry University | Zheng L.,Northeast Forestry University | Yang C.-P.,Northeast Forestry University
Molecular Biology Reports | Year: 2012

Glycine-rich RNA-binding proteins (GRPs) are involved in post-transcriptional regulation of genes, which have been found to play a role in stress response. However, whether GRPs can mediate some physiological responses related to salt stress tolerance is still not known. In the present study, we investigated the role of GRPs in salt stress-induced physiological responses by generating transgenic tobacco lines overexpressing a GRP (LbGRP1) gene from Limonium bicolor (Bunge) Kuntze. Compared with wild type (WT) tobacco, the transgenic plants showed significantly improved superoxide dismutase and catalase activities under salt stress conditions. Levels of proline in the transgenic plants were significantly higher than those in the WT plants grown under NaCl stress conditions. Furthermore, Na + content and Na +/K + ratio in the transgenic plants were lower than those in the WT plants under both normal growth and stress conditions. These results suggested that overexpression of the LbGRP1 gene can affect some physiological processes associated with salt tolerance of plants. Therefore, we hypothesize that LbGST1 can enhance stress resistance by mediating some physiological pathways. © 2011 Springer Science+Business Media B.V.

Wei H.,Chinese Academy of Sciences | Ren J.,Jilin Provincial Academy of Forestry science | Zhou J.,Zhejiang Academy of Agricultural Sciences
Soil Science and Plant Nutrition | Year: 2013

Slow growth rate limits the development of seedlings from the Podocarpaceae family. The extended photoperiod (EP) is well known to promote tree seedling growth, but it may also cause the possibility of nutrient dilution without a proper nutrient supply regime. Exponential fertilization (EF) has been proven to counter nutrient dilution within tree seedlings efficiently. However, no study has determined the response of Podocarpus seedlings to the interaction of EF and photoperiod. We fed 13-month old Buddhist pine (Podocarpus macrophyllus [Thunb.] D. Don) seedlings using EF applied at rates of 0 (control), 50 (E50), 100 (E100), and 150 (E150) mg nitrogen (N) seedling-1 for 5 months, during which half of all seedlings were cultured in the natural photoperiod (NP) with the others exposed to EP. The longer photoperiod resulted in greater seedling height and biomass accumulation of Buddhist pine seedlings. Relative to NP, EP increased N content at the whole-plant level but decreased N concentration in the stem and root, which indicated the symptom of N dilution. However, both phosphorus (P) content and P concentration increased in response to the longer photoperiod. EF rates in the E100 and E150 treatments were evaluated to be the 'sufficiency' ones for both N and P in EP and NP, respectively. In conclusion, EP could stimulate the growth of Buddhist pine seedlings but caused N dilution within them at the same time, and photoperiod would change the nutritional response of these seedlings to EF. © 2013 © Japanese Society of Soil Science and Plant Nutrition.

Kong W.Y.,Jilin Provincial Academy of Forestry science
Dong wu xue yan jiu = Zoological research / "Dong wu xue yan jiu" bian ji wei yuan hui bian ji | Year: 2013

In autumn of 2008 and 2009, we studied the foraging habitat selection of Siberian Crane (Grus leucogeranus) in the Momoge Nature Reserve of Jilin province. Using the resource selection index, resource selection functions, and the chi-squared test, we found that the Siberian Crane exhibited selectivity in their preferred foraging environments in relation to the distance to human disturbances, vegetation density, coverage and height, foraging vegetation density and water level. Interestingly, this selectivity in regards to large scale disturbances was lower than other factors. The characteristics of favorite foraging habits of Siberian Cranes include a variety of factors: a distance >5 000 m from a national highway, >1 500 m from a non-gravel road, >1 000 m from the nearest road, >1 000 m from a residential area, >1 000 m from farmland; plant density between 20 and 50 grass/m(2); plant coverage lower than 10%; plant height lower than 20 cm; Scirpus planiclmis density between 1 and 50 grass/m(2); Scirpus triqueter density between 1 and 10 grass/m(2); and the water level between 40 and 60 cm. The resource selection functions of Siberian Crane foraging habitat in autumn can be described thusly: Logistic (P) = 0.663 + 0.565×distance to national highway + 0.042×distance to non-gravel road + 0.519×distance to the nearest road + 0.353×distance to residential area + 0.169×distance to farmland - 0.455×vegetation density - 0.618×vegetation coverage - 0.548×vegetation height - 0.158×Scirpus planiclmis density - 0.404×Scirpus triqueter density + 0.920×water level,T (x) =e(Logistic(p)) / [1 + e(Logistic(p))], with an overall prediction accuracy of 82.9%.

Duan J.,Beijing Forestry University | Xu C.,Beijing Forestry University | Jacobs D.F.,Purdue University | Ma L.,Beijing Forestry University | And 4 more authors.
Scandinavian Journal of Forest Research | Year: 2013

Traditional nursery culture of Changbai larch (Larix olgensis Henry) in Northeast China requires up to a 2-year nursery production period. The high cost of seedling culture for this duration has been identified as a constraint. As a potential means to help to shorten the cultural period, we evaluated growth, biomass accumulation, and nitrogen (N) uptake dynamics of 1-year-old seedlings subjected to nutrient-loading treatments at intensive rates of 500 mg N seedling-1 supplied exponentially (E500) and 135 mg N seedling-1 supplied exponentially (E135) or conventionally (constant). Also included were an unfertilized control and the standard fertilizer regime for 2-year-old seedling production (77 mg N seedling-1 supplied conventionally over 2 years). At the end of nursery culture, though seedlings in the constant treatment had more biomass and N accumulation at the whole-seedling level, much of this was allocated to needles. While seedlings in the E500 treatment exhibited signs of toxicity, those in the E135 treatment had equivalent end-of-nursery N concentration in woody tissues to those produced over 2 years; root collar increment and survival 69 d after outplanting were also similar. Our results suggest that exponential nutrient loading at an optimal rate could increase available nutrient reserves in woody tissues of deciduous tree seedlings, therefore having the potential to improve seedling performance after outplanting. © 2013 Copyright Taylor and Francis Group, LLC.

Zhang Z.,CAS Changchun Northeast Institute of Geography and Agroecology | Lu X.,CAS Changchun Northeast Institute of Geography and Agroecology | Song X.,CAS Changchun Northeast Institute of Geography and Agroecology | Song X.,University of Chinese Academy of Sciences | And 2 more authors.
Journal of Soils and Sediments | Year: 2012

Purpose: The theory of ecological stoichiometry has improved understanding of nutrient circulation processes in ecosystems. The purpose of this work was to study ecological stoichiometric characteristics of carbon, nitrogen and phosphorus in wetland soils of Sanjiang Plain, northeast China. Materials and methods: A Deyeuxia angustifolia wetland (swamp meadow) and a Carex lasiocarpa wetland (marsh) were chosen for collection of soil cores (0-30 cm depth). Soil organic carbon, total nitrogen and phosphorus were analyzed to study patterns of C/N (RCN), C/P (RCP), N/P (RNP), and C/N/P (RCNP) in wetland soils. Results and discussion: Soil carbon, nitrogen and phosphorus stoichiometry differed between the two wetlands. Soil RCN (0-30 cm depth) in the D. angustifolia wetland was close to that in C. lasiocarpa wetland (12. 97 and 12. 80, respectively), but RCP and RNP in C. lasiocarpa soils were significantly higher than those in D. angustifolia soils. RCN changed little within soil profile, without obvious trends in both wetlands. Both RCP and RNP decreased with depth from the surface, and both RCP and RNP were higher at every depth interval in C. lasiocarpa soils compared to D. angustifolia soils. RCN in surface soil (0-10 cm, organic-rich "Lo" layer) was not significantly different from RCN in the entire profile (0-30 cm, "La layer") of D. angustifolia wetland, while RCP and RNP were both significantly different between the Lo and La layers. In Carex lasiocarpa wetland, RCN, RCP and RNP in Lo layer were significant higher than those in La layer. RCNP in La layer of D. angustifolia and C. lasiocarpa wetlands were 65:5:1 and 163:13:1, respectively. Conclusions: Soil RCN was relatively consistent, while RCP and RNP reflected P limitation in wetlands of Sanjiang Plain. Further research is needed to determine whether these ratios hold among other wetland ecosystems. © 2012 Springer-Verlag.

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