@article{JiangChenBelimovetal.2012, author = {Jiang, Fan and Chen, Lin and Belimov, Andrey A. and Shaposhnikov, Alexander I. and Gong, Fan and Meng, Xu and Hartung, Wolfram and Jeschke, Dieter W. and Davies, William J. and Dodd, Ian C.}, title = {Multiple impacts of the plant growth-promoting rhizobacterium Variovorax paradoxus 5C-2 on nutrient and ABA relations of Pisum sativum}, series = {Journal of Experimental Botany}, volume = {63}, journal = {Journal of Experimental Botany}, number = {18}, doi = {10.1093/jxb/ers301}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-127011}, pages = {6421-6430}, year = {2012}, abstract = {Resolving the physiological mechanisms by which rhizobacteria enhance plant growth is difficult, since many such bacteria contain multiple plant growth-promoting properties. To understand further how the 1-aminocyclopropane-1-carboxylate (ACC) deaminase (ACCd)-containing rhizobacterium Variovorax paradoxus 5C-2 affects plant growth, the flows and partitioning of mineral nutrients and abscisic acid (ABA) and ABA metabolism were studied in pea (Pisum sativum) plants following rhizosphere bacterial inoculation. Although root architecture was not affected, inoculation increased root and shoot biomass, and stomatal conductance, by 20, 15, and 24\%, respectively, and increased N, P, K, Ca, and Mg uptake by 16, 81, 50, 46, and 58\%, respectively. P deposition in inoculated plant roots was 4.9 times higher than that in uninoculated controls. Rhizobacterial inoculation increased root to shoot xylem flows and shoot to root phloem flows of K by 1.8- and 2.1-fold, respectively. In control plants, major sinks for K deposition were the roots and upper shoot (43\% and 49\% of total uptake, respectively), while rhizobacterial inoculation increased K distribution to the lower shoot at the expense of other compartments (xylem, phloem, and upper shoot). Despite being unable to metabolize ABA in vitro, V. paradoxus 5C-2 decreased root ABA concentrations and accumulation by 40-60\%. Although inoculation decreased xylem ABA flows, phloem ABA flows increased. Whether bacterial ACCd attenuates root to shoot ABA signalling requires further investigation, since ABA is critical to maintain growth of droughted plants, and ACCd-containing organisms have been advocated as a means of minimizing growth inhibition of plants in drying soil.}, language = {en} } @article{SongJiaZhangetal.2016, author = {Song, Ning-Ning and Jia, Yun-Fang and Zhang, Lei and Zhang, Qiong and Huang, Ying and Liu, Xiao-Zhen and Hu, Ling and Lan, Wei and Chen, Ling and Lesch, Klaus-Peter and Chen, Xiaoyan and Xu, Lin and Ding, Yu-Qiang}, title = {Reducing central serotonin in adulthood promotes hippocampal neurogenesis}, series = {Scientific Reports}, volume = {6}, journal = {Scientific Reports}, number = {20338}, doi = {10.1038/srep20338}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-168004}, year = {2016}, abstract = {Chronic administration of selective serotonin reuptake inhibitors (SSRIs), which up-regulates central serotonin (5-HT) system function, enhances adult hippocampal neurogenesis. However, the relationship between central 5-HT system and adult neurogenesis has not fully been understood. Here, we report that lowering 5-HT level in adulthood is also able to enhance adult hippocampal neurogenesis. We used tamoxifen (TM)-induced Cre in Pet1-CreER\(^{T2}\) mice to either deplete central serotonergic (5-HTergic) neurons or inactivate 5-HT synthesis in adulthood and explore the role of central 5-HT in adult hippocampal neurogenesis. A dramatic increase in hippocampal neurogenesis is present in these two central 5-HT-deficient mice and it is largely prevented by administration of agonist for 5-HTR2c receptor. In addition, the survival of new-born neurons in the hippocampus is enhanced. Furthermore, the adult 5-HT-deficient mice showed reduced depression-like behaviors but enhanced contextual fear memory. These findings demonstrate that lowering central 5-HT function in adulthood can also enhance adult hippocampal neurogenesis, thus revealing a new aspect of central 5-HT in regulating adult neurogenesis.}, language = {en} }