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Université de Mongolie-Intérieure (2019)

Genetic Diversity Analysis of Reaumuria Soongorica Maxim. in Alxa Desert Area

乔宜青;

Titre : Genetic Diversity Analysis of Reaumuria Soongorica Maxim. in Alxa Desert Area

Auteur : 乔宜青;

Grade : Master’s Theses 2019

Université : Université de Mongolie-Intérieure

Résumé
The Alxa Desert Area is a typical desert region with a large scale in China.As an extremely xerophytic salt-tolerant undershrub,Reaumuria soongorica Maxim.is one of the most widely distributed plant species in the desert.Under the long-term effects of harsh environment,Reaumuria soongorica Maxim.has evolved many forms of adaptation in terms of morphologicalstructure,physiological functions and genetic characteristics.In this study,the genetic characteristics were considered to understand the adaptation mechanism of plants to the environment under long-term harsh conditions.The genetic diversity and differentiation of 10Reaumuria soongorica Maxim.populations in different habitats in Alxa desert area were analyzed by SSR(Simple Sequence Repeat)molecular marker technology to explore the effects of climate and soil factors on their morphological and genetic characteristics.The main conclusions are as follows:1)The correlation analysis between morphological characteristics and environmental factors showed that there was a significant difference between the two morphological indices(P<0.001),and the two morphological indices of Reaumuria soongorica Maxim.populations living in harsh habitats showed a low level.Soil organic matter was significantly correlated with the height of Reaumuria soongorica Maxim.(P<0.05) ;There was a significant correlation(P<0.05)between Reaumuria soongorica Maxim.and other factors including relative humidity,effective accumulated temperature,soil available phosphorus and soil organic matter in 20 cm-30 cm soil layer.In addition,soil pH values in all plots were greater than 7 and less than 10,showing weak alkalinity.2)SSR genetic diversity analysis indicates that the genetic diversity of Reaumuria soongorica Maxim.was abundant.The percentage of polymorphic bands(PPB)was as high as 96.26%.Furthermore,at species level,the Nei’s gene diversity index was 0.2185 and the Shannon’s information index is 0.3451.The genetic differentiation coefficient(GST)was 0.7202,the genetic differentiation was at a high level and most of the genetic variation(72.02%)existed between the populations.The variations of inter-population and intra-population were extremely significant(P<0.001).The gene flow was at a low level(Nm=0.1943<1),which suggested that less gene exchange occurred among populations.At the population level,the trend of Nei’s gene diversity index was basically consistent with Shannon’s information index.The highest value of the Reaumuria soongorica Maxim.population was in YinGen(0.0820 ;0.1315),while the lowest value was in LuanJingtan(0.0421 ;0.0794).Thus,the Reaumuria soongorica Maxim.population in the YinGen has the most abundant genetic diversity

Mots clés : Alxa desert area; Reaumuria soongorica Maxim.; SSR; Genetic diversity;

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Page publiée le 28 mai 2020