Xian Botanical Garden of Shaanxi Province

Fengcheng, China

Xian Botanical Garden of Shaanxi Province

Fengcheng, China
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Wang Y.-L.,Xian Botanical Garden of Shaanxi Province | Wang Y.-L.,Chinese Academy of Sciences | He Z.-C.,Chinese Academy of Sciences | Ejder E.,Swedish Magnolia Group | And 2 more authors.
Cytologia | Year: 2016

Cytological studies were conducted on five tetraploid species plus two varieties of Magnolia subgenus Yulania and a hybrid between two of these species. Two different chromosome configurations in meiosis are observed in this article. The first group was typical for M. acuminata, M. liliiflora and their relatives which share several cytological characteristics including chromosome configurations and behavior in meiosis. The cytological evidence indicate autotetraploid origin for these species, despite the homologous chromosomes likely having changed their structures causing the formation of heteromorphic multivalents, chromosome bridges and fragments during meiosis. The second group of chromosome configuration was found in M. cylindrica and M. concinna. These species were characterized by very rare trivalents and tetravalents. These observations suggest these taxa as allotetraploids which may have been formed from hybridisation between hexaploid and diploid parents as deduced from trivalents observed at some rate. Multivalent formation and possible translocations and inversions of chromosomes in M. liliiflora influence its propagation by causing low fertility. M. liliiflora is probably a comparatively new species with an unstable chromosome constitution and is growing only in small populations at low elevation. It is vulnerable, and the species could already be extinct in nature. On the other hand, M. acuminata shows a more regular chromosome behavior and fewer abortion spores than M. liliiflora, and should be a more stable species with longer evolution time. Thus, the superior fertility of M. acuminata has enabled it to develop a stable and extensive distribution from NE to SE USA. © 2016 The Japan Mendel Society.

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.

Liu H.-Y.,Hebei University | Mao S.-L.,Xian Botanical Garden of Shaanxi Province | Shi F.-M.,Hebei University
Zootaxa | Year: 2014

Four new species of Pentacentrus Gorochov from China are described and illustrated, P. acutiparamerus Liu & Shi sp. nov., P. biflexuous Liu & Shi sp. nov., P. emarginatus Liu & Shi sp. nov. and P. parvulus Liu & Shi sp. nov. A key and a distribution map of the Chinese species of this genus are provided. Copyright © 2014 Magnolia Press.

Hu M.L.,South China Agricultural University | Li Y.Q.,South China Agricultural University | Bai M.,South China Agricultural University | Wang Y.L.,Xi'an Botanical Garden of Shaanxi Province | Wu H.,South China Agricultural University
Trees - Structure and Function | Year: 2015

Key message: The volatile oil yields and compositions ofMagnolia zeniiflower at different growth stages had significant differences. Moreover, the yields was influenced by the density of cells and degree of oil accumulation. Abstract: To investigate the variations of the contents and chemical compositions of volatile oil in Magnolia zenii flower, gas chromatography–mass spectrometry (GC–MS) and microscopic techniques were employed to detect the volatile compounds of M. zenii flowers at various growth stages. The results indicated that the volatile oil yields in M. zenii flower at different growth stages had significant differences, which were not only closely related to the internal factors of the oil cell densities and oil accumulation degree, but they were also related to the external factors of environmental conditions. With the appropriate temperatures and long sunshine in October of 2013, the flower buds had the maximum percentage of oil cells at the oil saturation stage and the highest density of oil cells (164.50 n/mm2), which coincided with the highest oil yield (11.61 %). With a sharp decline in the temperature and sunshine in November of 2013, the volatile oil yield was significantly lower (5.02 %). In the full flowering stage in March of 2014, flower buds had a higher percentage of oil cells at the oil degrading stage and the lowest oil cell density (23.75/mm2), resulting in the lowest oil yield (3.07 %). Abundant medicinal components and perfume components in the M. zenii flower were detected by GC–MS analysis, which had significant pharmacological effects or could serve as perfume materials. These results provided reference information for the economic value evaluation and rational utilization of the M. zenii flower. © 2015, Springer-Verlag Berlin Heidelberg.

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