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Hebei University (2021)

Species Diversity and Ecological Distribution of Arbuscular Mycorrhizal Fungi in Desert Relict Plant Gymnocarpos Przewalskii

张开逊

Titre : Species Diversity and Ecological Distribution of Arbuscular Mycorrhizal Fungi in Desert Relict Plant Gymnocarpos Przewalskii

Auteur : 张开逊

Grade : Master 2021

Université : Hebei University

Résumé partiel
Gymnocarpos przewalskii Maxim(Cauyophyllaceae,Gymnocarpos Forssk.)is a perennial shrub which belongs to the ancient Mediterranean floral region and was designated as national level to protect plants in China.G.przewalskii is also the main constructive species of the rocky desert.In addition,as a relict plant of the Tertiary,it’s survival and evolution of the development process is extremely important for the study of ancient Mediterranean climate and xeric plant evolution.Anxi extreme drought desert national ature reserve and Minqin Liangucheng national nature Reserve are the main distribution areas of G.przewalskii.The typical arid desert ecosystem has an important research status for physical geography and the occurrence and evolution of ancient Mediterranean floral region.The symbiotic structure of arbuscular mycorrhizal fungi(AMF)and plant roots can promote the absorption of nutrients by plants which is of great significance to the growth,development and reproduction of plants under adversity stress.Moreover,AMF can improve soil stability and promote soil material exchange by form hyphal network structure and Glomalin-related soil protein,which is valuable to the restoration and monitoring of the ecological environment.In this study,root and soil samples was collected from the rhizosphere 0-10 cm and10-20 cm of G.przewalskii in July 2018,July,September,and December 2019 across Anxi and Minqin.The ecological distribution,species diversity and community structure of AMF in the rhizosphere of G.przewalskii were studied through morphological methods combined with high-throughput sequencing.Provide a basis for interpretation of indicators of environmental change desert areas AMF data,while providing a usable way to protect fruit trees bare.The main results were as follows:1.In the two sites,G.przewalskii’s root system could form a symbiotic structure with AMF at all sampling times.In Anxi,the colonization rate of AMF was 40-80% in summer of2018,and was 38-75.3% across three seasons in 2019,the density of AMF spores was 21-63(num/20 g soil).In the summer of 2018,the AMF colonization rate was 70-80%,and in the three seasons of 2019 was 47.53-71% in Minqin ;the spore density was 73-314(num/20 g soil).The colonization rate of AMF was significantly positively correlated with temperature,soil humidity,total nitrogen,and EE-GGRSP ;spore density was significantly positively correlated with temperature,soil humidity,organic carbon,total phosphorus,and T-GRSP.The differences in AMF colonization rate and spore density in different seasons were significant,and spore density was significantly affected by sites.2.A total of 42 AMF in 5 genera were identified soil through morphological identification in Anxi,including 18 species of Acaulospora,17 species of Glomus,and 3species of Claroideoglomus and Septoglomus,Funneliformis 1 species ;8 genera and 46 species of AMF were identified from Minqin,including 18 species of Acaulospora and 17 species of Glomus,3 species of Claroideoglomus and Septoglomus,2 species of Rhizophagus,Diversispora,Funneliformis and Scutellospora were 1 species,respectively.

Mots clés : AMF ;Species diversity ;Ecological distribution ;Community structure ;High-throughput sequencing ;G.przewalskii ;Arid desert ;

Présentation (CNKI)

Page publiée le 2 novembre 2021