Subjects: Biology >> Botany submitted time 2023-01-30 Cooperative journals: 《广西植物》
Abstract：
Wild plants are an important part of the natural ecological system, and China is one of the countries with the most abundant wild plant species. It is of great significance to study the distribution characteristics, protection status and of potential distribution areas of National Key Protected Wild Plants for supporting and formulating biodiversity conservation strategies. In this study, we built an occurrence database containing 1 032 species (belonging to 315 genera, 129 families) of National Key Protected Wild Plants, then used the top 5% richness algorithm to identify hotspots and evaluate the conservation effectiveness and gaps of current nature reserves. Furthermore, we used maximum entropy (MaxEnt) model to predict the potential distribution and range shifts of National Key Protected Wild Plants. The results were as follows: (1) The areas with the highest species richness of the National Key Protected Wild Plants mainly confined to south and southwest of China, especially central Sichuan, southern and southeastern Yunnan, northern Guangxi, northern Guangdong and Hainan. (2) The conservation effectiveness of hotspot grid cells showed that 171 (85.50 %) hotspots are efficient protection (including 80.5 % of total species) and 29 hotspots (14.50 %) are not effectively protected (including 51.2 % of total species). (3) By comparing the potential distribution of National Key Protected Wild Plants under current and future climate scenarios, we found that potential distribution would expand to southeast of Xizang, southwestern Guangxi, southern Guangdong, and southern Fujian in the future, while those around Sichuan Basin, southern Yunnan and southern Guizhou would shrink. Therefore, it is necessary to strengthen the dynamic monitoring of biodiversity and pay continuous attention to the impact of climate change on National Key Protected Wild Plants in the region. Based on the analysis results of hotspot grids, conservation effectiveness and potential distribution areas identified in this study, strong data support and reference can be provided for the identification of national priority protected areas for National Key Protected Wild Plants diversity and the formulation of conservation policies.
Subjects: Biology >> Botany >> Applied botany submitted time 2018-09-07 Cooperative journals: 《广西植物》
Abstract： Hydrangea L. was founded by Linnaeus in 1753 based on a species of American. It is a large genus in Hydrangeaceae containing about 73 species, most of which distributed in eastern to south-eastern Asia, south-eastern North America to Central America and western South America. There are more than 40 species in China, mainly distributed in the south-west and south-east. In order to study taxonomic value and systematic significance of Hydrangea L. as well as clarify phylogenetic relationships among the genus and its related ones, pollen samplings of 41 species of Hydrangea and its related species from China and surrounding areas were observed under scanning electron microscope (SEM). The results indicate that the pollens of all these species are tricolporate; the pollen morphology are most subprolate and a few Subspheroida; ellipse or circular in equatorial view; circular or sometimes triangular in polar view. The ornamentations on the exine can be reticulate ornamentations or perforate ornamentations. The ornamentation in the mesh can be smooth or granular bulged. The above-mentioned species can be divided into 4 groups according to the pollen morphology and ornamentations on the exine, the characters of each group are respectively pollen morphology subprolate, ornamentation on the exine reticulate; pollen morphology subprolate, ornamentation on the exine perforate; pollen morphology Subspheroida, ornamentation on the exine reticulate; pollen morphology Subspheroida, ornamentation on the exine perforate. Further, according to the ratio of polar axis to equatorial axis, these species can be divided into 8 types. The study shows that the pollen characters can provide valuable evidence for infrageneric taxonomic treatments and species circumscription. However, this evidence shows limited value in diagnosing some major clades of phylogenetic trees reconstructed in previous studies. Further studies including broader sampling and new evidence of Hydrangea pollen are needed to explore its taxonomic and systematic value.
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