Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : Cloning and Functional Analysis of SOS Gene from Desert Plant Karelinia Caspia

Auteur : 郭媛

Grade : Master 2022

Université : Tarim University

Résumé partiel
Due to geography,environment and climate,and abiotic stress is one of the important reasons for the decline in crop yield.Vegetation loss due to abiotic stress reaches 6%～20%,and the global salinized soil accounts for 5%of the land area.Saline alkali land is a part of ecosystem.Its unique physical and biological characteristics often lead to the abnormal circulation of ecosystem material and energy,resulting in the waste of ecological resources,fragile ecological environment,and serious economic and secondary disasters.The signal pathway of salt hypersensitivity（SOS）stress is related to ion stability and salt tolerance.SOS signaling pathway consists of three main proteins:SOS1,SOS2 and SOS3.Through the cloning of SOS pathway genes,this study provides gene resources and research basis for the application of functional genes.Karelinia caspia less is a desert plant widely distributed in the Tarim Basin of Xinjiang.Because it often grows in deserts and other natural environments,firewood has strong drought resistance,high temperature resistance,salt resistance and other stress resistance.It is one of the most important plant resources to study the stress resistance of desert plants,and provides gene resources for crops such as cotton.This paper aims to clone the genes related to the SOS pathway of firewood and analyze its gene function.The main results are as follows :（1）The SOS pathway related genes SOS2 and SOS3 genes were successfully cloned and analyzed by bioinformatics.The sequencing sequence of SOS2 was analyzed.The results showed that its length was1404 bp and encoded 467 amino acids.It was named Kc SOS2.The sequencing sequence of SOS3 was analyzed.The results showed that its length was 651 bp and contained 216 amino acids.Therefore,it was named Kc SOS3.NCBI online comparison showed that the similarity of amino acid sequences between Kc SOS2 and sunflower SOS2 was the highest,up to 90.83% ;Kc SOS3 and sunflower SOS3 had the highest amino acid sequence consistency,up to 90.32%.（2）The gene expression patterns of Kc SOS2 and Kc SOS3 in Karelinia caspia were analyzed under the four abiotic stress conditions of 300 mmol/L Na Cl and 100 mmol/L Na2CO3,natural drought for 6 days,45℃high temperature and 4℃low temperature,and 15%PEG osmotic stress.The results showed that the expression of SOS3 was similar in untreated roots,stems and leaves,but higher in roots than in stems and leaves.It indicates that Kc SOS3 is expressed in tissue-specific manner.The expression of Kc SOS3gene in roots and stems showed a low high low trend under saline alkali stress ;

Mots clés : desert plants ;Karelinia caspia ;abiotic stress ;SOS gene ;

Présentation (CNKI)