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

Accueil du site → Doctorat → Chine → 2021 → Study on Low Phosphate Adaptation Mechanisms of Desert Shrub Zygophyllum Xanthoxylum

Lanzhou University (2021)

Study on Low Phosphate Adaptation Mechanisms of Desert Shrub Zygophyllum Xanthoxylum

胡晓炜

Titre : Study on Low Phosphate Adaptation Mechanisms of Desert Shrub Zygophyllum Xanthoxylum

Auteur : 胡晓炜

Grade : Doctoral Dissertation 2021

Université : Lanzhou University

Résumé partiel
Phosphorus(P)is essential for the growth and development of plants.Because of water deficit,salt accumulation in surface soil and limited cation exchanges,P is one of the major limiting nutrients in desert areas.Zygophyllum xanthoxylum is a dominant species in desert area and has strong stress resistance.But its low-phosphorus adaptation mechanism has not yet been reported.In this study,Z.xanthoxylum was used as the material and processed with different P levels to study the relationship between P efficiencies and P homeostasis,and clarify the P redistribution strategy,research the photosynthetic process response to low phosphorus and its mechanism,through RNAseq to analyse the changes of genes and pathway involved in P absorption and P utilization.The researche provided basic information and new perspectives for understanding of the biological processes of desert plants adapting to low Pi environments,and generate important significance for the restoration of the ecological environment of desert areas and the genetic improvement of forages.The main conclusions are as follows :(1)Z.xanthoxylum had a high ability to absorb and utilize P.The desert plant Nitraria tangutorum was used as a control.The biomass,P concentrations and relative growth rates were proved have no significant differences in Z.xanthoxylum with increasing amounts of Pi ;while the control plant Nitraria tangutorum showed upward trends ;The P homeostasis of Z.xanthoxylum was higher than that of N.tangutorum,and P concentrations in all treatments were lower than in N.tangutorum,but C:P were higher than in N.tangutorum.It showed that Z.xanthoxylum had stronger P utilization capacity.The strong P efficiency,and high and stable dry matter accumulation,were likely contributors in maintaining homeostasis.

Mots clés : low phosphate stress ;phosphorus efficiencies ;phosphorus homeostasis ;transcriptome analysis ;Zygophyllum xanthoxylum ;

Présentation (CNKI)

Page publiée le 15 février 2022