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Di J.-X.,Hebei University | Han L.,Hebei University | Mao S.-L.,Xian Botanical Garden of Shaanxi Province | Mao S.-L.,Institute of Botany of Shaanxi Province | Shi F.-M.,Hebei University
Zootaxa | Year: 2015

Two new species of the genus Xizicus are described, namely Xizicus (Eoxizicus) uncicercus Mao & Shi sp. nov. and Xizicus (Eoxizicus) dischidus Di, Han & Shi sp. nov. from China, in addition, photographs of morphological structure of the species are provided. All type specimens are deposited in the Museum of Hebei University, Baoding, P. R. China. © 2015 Magnolia Press.

Ni X.-L.,Northwest University, China | Ni X.-L.,Ningxia Forestry Institute | Su H.,Northwest University, China | Zhou Y.-F.,Institute of Botany of Shaanxi Province | And 2 more authors.
Physiologia Plantarum | Year: 2015

Some species of Allium in Liliaceae have fistular leaves. The fistular lamina of Allium fistulosum undergoes a process from solid to hollow during development. The aims were to reveal the process of fistular leaf formation involved in programmed cell death (PCD) and to compare the cytological events in the execution of cell death to those in the unusual leaf perforations or plant aerenchyma formation. In this study, light and transmission electron microscopy were used to characterize the development of fistular leaves and cytological events. Terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) assays and gel electrophoresis were used to determine nuclear DNA cleavage during the PCD. The cavity arises in the leaf blade by degradation of specialized cells, the designated pre-cavity cells, in the center of the leaves. Nuclei of cells within the pre-cavity site become TUNEL-positive, indicating that DNA cleavage is an early event. Gel electrophoresis revealed that DNA internucleosomal cleavage occurred resulting in a characteristic DNA ladder. Ultrastructural analysis of cells at the different stages showed disrupted vacuoles, misshapen nuclei with condensed chromatin, degraded cytoplasm and organelles and emergence of secondary vacuoles. The cell walls degraded last, and residue of degraded cell walls aggregated together. These results revealed that PCD plays a critical role in the development of A. fistulosum fistular leaves. The continuous cavity in A. fistulosum leaves resemble the aerenchyma in the pith of some gramineous plants to improve gas exchange. © 2014 Scandinavian Plant Physiology Society.

Mao Z.,Institute of Botany of Shaanxi Province | Mao Z.,Lanzhou University | Fu H.,Lanzhou University | Nan Z.,Lanzhou University | Wan C.,Lanzhou University
Food Chemistry | Year: 2014

The chemical composition of four common vetch (Vicia sativa L.) seeds was investigated to determine their nutrition value. The result shows that the seeds are low in lipid (1.55-2.74% of dry weight), and high in the unsaturated fatty acid (74.51-77.36% of total fatty acid). The ratio of essential amino acid to non-essential amino acid (0.62-0.69) is even higher than the amount (0.38) recommended by World Health Organization. Besides, the seeds are also found rich in Mg, Mn and Cu, but with a low ratio of Ca to P (0.24-0.73), which may increase the risk of the mineral element toxicity. The results indicate that the four common vetch seeds could be taken as an alternative food source, but the possible toxic effect should be taken into consideration. © 2014 Elsevier Ltd. All rights reserved.

Xiao W.,Central South University of forestry and Technology | Mao S.,Institute of Botany of Shaanxi Province | Wang J.,Shenyang University | Huang J.,Central South University of forestry and Technology
Far Eastern Entomologist | Year: 2016

A checklist of 48 species of Tettigoniidae (subfamilies Conocephalinae, Hexacentrinae and Meconematinae) recorded from Hunan Province of China is given based on the materials examined and published data. Ten species are new to the fauna of Hunan Province. © Far Eastern entomologist (Far East. entomol.).

Zhang Z.,CAS Wuhan Botanical Garden | Zhang Z.,Institute of Botany of Shaanxi Province | Cao Y.,CAS Wuhan Botanical Garden | Jeppesen E.,University of Aarhus | And 3 more authors.
Hydrobiologia | Year: 2016

The global climate change may lead to more extreme climate events such as severe flooding creating excessive pulse-loading of nutrients, including nitrogen (N), to freshwaters. We conducted a 3-month mesocosm study to investigate the responses of phytoplankton, zooplankton and Vallisneria spinulosa to different N loading patterns using weekly and monthly additions of in total 14 g N m−2 month−1 during the first 2 months. The monthly additions led to higher phytoplankton chlorophyll a and total phytoplankton biomass than at ambient conditions as well as lower leaf biomass and a smaller ramet number of V. spinulosa. Moreover, the biomass of cyanobacteria was higher during summer (August) in the monthly treatments than those with weekly or no additions. However, the biomass of plankton and macrophytes did not differ among the N treatments at the end of the experiment, 1 month after the termination of N addition. We conclude that by stimulating the growth of phytoplankton (cyanobacteria) and reducing the growth of submerged macrophytes, short-term extreme N loading may have significant effects on shallow nutrient-rich lakes and that the lakes may show fast recovery if they are not close to the threshold of a regime shift from a clear to a turbid state. © 2015, Springer International Publishing Switzerland.

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