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Inner Mongolia University (2021)

Diversity of Mycorrhizal and Symbiotic Microoganisms of Six Rare Plants in Western Ordos Desert

徐道龙

Titre : Diversity of Mycorrhizal and Symbiotic Microoganisms of Six Rare Plants in Western Ordos Desert

Auteur : 徐道龙

Grade : Doctoral Dissertation 2021

Université : Inner Mongolia University

Résumé partiel
West Ordos Desert is known as the distribution center of endemic genera of plants in Inner Mongolia Plateau and Central Asia.Rare plants such as Tetraena mongolica have adapted to the arid and barren habitat with different survival strategies.Exploring these plants’ biological symbiosis characteristics of arbuscular mycorrhizal,mycorrhizal structure,diversity of arbuscular mycorrhizal fungi(AMF)in plant root and rhizosphere soils,and other microbial diversity of these plants,which is biologically important to reveal the plants biogeographic distribution and adaptationmechanisms of these plants to harsh environment.This thesis regards the rare and endemic shrub species,Tetraena mongolica,Sarcozygium xanthoxylon,Nitraria tangutorum,Ammopiptanthus mongolicus,Potaninia mongolica and Helianthemum songaricum and their communities,plant root and rhizosphere soils as the research objects.We assessed the community composition and mycorrhizal characteristics by collecting data of plant communities and soil physicochemical properties extensively in the study area.Based on this,we explored the AM mycorrhizal symbiotic biology of plant roots and the diversity of AM fungi and microorganisms with the help of multiple analytical methods such as morphological taxonomy and high-throughput sequencing technology.The effects of soil factors on AM fungal and microbial communities were analyzed with structural equation models.The main results include:1)The plant community investigated in the study area,which revealed that there were 27 species in 11 families and 22 genera in the community,of which 22.22%were Asteraceae,14.81% were Gramineae,and 11.11% were tribulaceae.According to the analysis of diversity indicators,the order of community diversity of the sample sites were as follows : Sihemu core plot(SA)>Hangjin Banner Baragon plot(HA)>Qipanjing plot(BA)>Qianlishan plot(QA).2)No arbuscular structure was found in the roots of three plants in the Tribulus family,Tetraena mongolica,Sarcozygium xanthoxylon,and Nitraria tangutorum,but vesicular and mycelial structures were identified,and microclerotia specialized structures were found in the root segments of Tetraena mongolica and Sarcozygium xanthoxylon.The AM mycorrhizal structure of Potaninia mongolica was very typical,with vesicles and arbuscular structures.In addition to vesicles,intercellular hyphae,and microsclerotia,some special hyphae structures of dark septate endophytic fungi were also found in the root segments of Helianthemum songaricum plants.

Mots clés : Western Ordos Desert ;Rare plants ;Mycorrhizal;Symbiotic microorganisms ;Diversity;

Présentation (CNKI)

Page publiée le 20 octobre 2021