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

Accueil du site → Doctorat → Chine → 2020 → Molecular Mechanism of Environmental Adaptation of Heterophylly in Populus Euphratica Oliv.

Beijing Forestry University (2020)

Molecular Mechanism of Environmental Adaptation of Heterophylly in Populus Euphratica Oliv.

曾明;

Titre : Molecular Mechanism of Environmental Adaptation of Heterophylly in Populus Euphratica Oliv.

Auteur : 曾明;

Grade : Doctoral Dissertation 2020

Université : Beijing Forestry University

Résumé partiel
Heterophylly is the phenomenon that plants produce different forms of leaves in the same plant based on phenotypic plasticity,which is a survival strategy for plants to adapt to the environment and optimize resource utilization.Populus euphratica Oliv.,a typical heterophyllous woody plant,is the only natural tree species and important grouping tree species in the desert areas of Central Asia and Northwest China,playing an important role in resisting wind and sand,maintaining regional ecological balance and biodiversity.Adult P.euphratica developed various forms of leaves,such as lanceolate leaves,ovate leaves,and dentate broad-ovate leaves,which can acclimatize to adverse conditions and becomes an important model tree for researching the environmental adaptation of trees.To date,the research on environmental adaptability of heteromorphic leaves in P.euphratica mainly focused on morphological structure and physiological characteristics,however,research on its molecular mechanisms is limited.The comparative study of the molecular biology of heteromorphic leaves in P.euphratica could reveal the mechanism of environmental adaptation in P.euphratica to a certain degree.Moreover,there is important theoretical and practical significance to the protection and rejuvenation of P.euphratica forest and vegetation restoration in arid and semi-arid areas.In this study,comparative analysis of physiological and biochemical characteristics,protein expression,expression of coding genes and non-coding RNAs(lncRNA,circRNA,miRNA)has been conducted among lanceolate leaves,ovate leaves,and dentate broad-ovate leaves.Based on these results,the competitive endogenous RNA network was further analyzed,and the function of the key differentially expressed gene PePIP2 ;5 in the competitive endogenous RNA network was investigated.This study could reveal the molecular mechanism of environmental adaptation of heteromorphic leaves in P.euphratica,and provide a reference for the study of the mechanism of environmental adaptation of heterophyllous plants,especially heterophyllous woody plants.The main results are as follows :(1)Investigation of the relationship between physiological and biochemical characteristics of three typical heteromorphic leaves in P.euphratica and adaptability to the heterogeneous environment was performed.The results showed that the light conditions of the upper canopy are superior to that of the lower canopy.The lanceolate leaves in the lower canopy showed shade resistance,with smaller specific leaf weight,dark respiration rate,light compensation point and light saturation point,making them more effective in capturing light energy in low light conditions and reducing Carbon loss to make photosynthetic product accumulated

Mots clés : Populus euphratica Oliv.; heteromorphic leaves; environmental adaptation; non-coding RNA; PePIP2; 5;

Présentation (CNKI)

Page publiée le 16 juin 2021