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Pang C.-H.,Shandong Normal University | Pang C.-H.,Shandong Academy of Forestry | Li K.,Shandong Normal University | Wang B.,Shandong Normal University
Physiologia Plantarum | Year: 2011

To evaluate the physiological importance of chloroplastic ascorbate peroxidase (CHLAPX) in the reactive oxygen species (ROS)-scavenging system of a euhalophyte, we cloned the CHLAPX of Suaeda salsa (SsCHLAPX) encoding stromal APX (sAPX) and thylakoid-bound APX. The stromal APX of S. salsa (Ss.sAPX) cDNA consists of 1726 nucleotides including an 1137-bp open reading frame (ORF) and encodes 378 amino acids. The thylakoid-bound APX of S. salsa (Ss.tAPX) cDNA consists of 1561 nucleotides, including a 1284-bp ORF, and encodes 427 amino acids. The N-terminal 378 amino acids of Ss.sAPX are identical with those of Ss.tAPX, whereas the C-terminal 49 amino acids differ. Arabidopsis thaliana lines overexpressing Ss.sAPX and Ss.tAPX were constructed using Agrobacterium tumefaciens transformation methods. Under high light (1000 μmol m -2 s -1), malondialdehyde (MDA) content was lower in transgenic plants than in the wild type. Under high light, Fv/Fm and chlorophyll contents of both overexpressing lines and the wild type declined but were significantly higher in the overexpressing lines than in the wild type. The activities of APX (EC, catalase (CAT and superoxide dismutase (SOD EC were higher in the overexpressing lines than in the wild type. The transgenic plants showed increased tolerance to oxidative stress caused by high light. These results suggest that SsCHLAPX plays an important role in scavenging ROS in chloroplasts under stress conditions such as high light. © 2011 Physiologia Plantarum.

Zhao X.,Northeast Forestry University | Zheng H.,Guangdong Academy of Forestry | Li S.,Shandong Academy of Forestry | Yang C.,Northeast Forestry University | And 2 more authors.
New Forests | Year: 2014

Poplar (Populus spp.) is one of the most important economical tree species in temperate regions of the world. Easy propagation by cutting has made most of the selected genotypes of poplar available for intensive plantation with large genetic gains. Critical point for successful propagation of cutting is the development of roots. Thus, rooting context of the cutting appeared to be a pivotal scenario in poplar vegetative propagations. In this overview, we focus on the progress in defining the genetic, physical, chemical and environmental factors that influences the poplar cuttings to develop adventitious roots. These factors include genotype effect, physiological conditions of the stock plants, plant growth regulators, temperature, rooting substrates/media as major variables for the development of rooting events. © 2013 Springer Science+Business Media Dordrecht.

Wu H.,Shandong Academy of Forestry | Liu H.,Shandong Academy of Forestry
PLoS ONE | Year: 2016

Insect movement behavior is highly important in entomological population ecology, behavioral ecology and conservation, and in invasion ecology. In this study, we used an exotic lace bug (Corythucha ciliata) as a model organism to address the hypothesis that an insect species invading a new area has a high host location ability and rapid mobility by which it can be successfully carried to a new habitat. To test this hypothesis, three movement parameters (speed, duration and distance) of C. ciliata were assessed using laboratory and field observations. We found that 5th-instar nymphs of C. ciliata could move as far as 750 cm throughout their lifespan and that they moved an average of 0.038 m/min during the first 15 minutes after release, which was significantly farther than that of other instars. Of the tested nymphs, 21.85% could locate their host trees; of adults released 20 m from hosts, 11% reached the host trees on the first day, with an average flight distance of 22.14 m and a maximum flight distance of 27 m. The results of this study partly explain the mechanism of rapid diffusion. These results are also important for predicting population spread, improving eradication surveys, and managing future introductions of C. ciliata. © 2016 Wu, Liu. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Wu H.-W.,Shandong Academy of Forestry | Li X.-C.,Shandong Academy of Forestry | Liu H.-X.,Shandong Academy of Forestry
Entomologica Fennica | Year: 2016

Food shortage is a prevalent threat to insect survival and successful reproduction in natural settings. An insect species invading new areas may have a high capacity to survive and adapt to starvation. To test these hypotheses, we assessed the survival time of Corythucha ciliata (Say), in a laboratory under two starvation conditions: complete starvation (no food supplied) and gradual starvation (food provided once and not replenished). Under complete starvation, survival of 3rd to 5th instar nymphs tended to decline steadily, whereas under gradual starvation this process was delayed in the initial stage. The average survival times increased as the instar increased under both conditions (14.0 h, 15.9 h and 24.4 h under complete starvation conditions; 27.8 h, 29.6 h and 33.6 h under gradual starvation conditions). The longest lived individual nymph survived for 49 hours. The results may partially explain the rapid global expansion of C. ciliata. © Entomológica Fennica. 15 February 2016.

Liu F.,Shandong Academy of Forestry | Xing S.,Shandong Academy of Forestry | Du Z.,Shandong Academy of Forestry
Communications in Soil Science and Plant Analysis | Year: 2011

Oxidation is known commonly to enhance humic acid (HAs) contents of coal, but in China, most humic substances are used directly as soil conditioners or applied in combination with fertilizers without oxidation. Therefore, we investigated the impact of nitric acid (HNO3) oxidation on the characteristics of HAs derived from a Chinese lignite. The results showed that total HA content was increased by HNO 3 oxidation, thus consequently increasing its cation exchange capacity and moderate humification. Besides, HAs extracted from oxidized lignite were richer in oxygen-containing functional groups with smaller molecular size than natural lignite. Compared with natural lignite, retention capacities of nitrogen and potassium by oxidized lignite were significantly greater. However, phosphorus-retention capacity was decreased to near zero, which might enhance the availability of phosphorus in soil. In general, optimum HNO 3 oxidation had favorable effects on lignite and improved its characteristics for use as a soil conditioner. © Taylor & Francis Group, LLC.

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