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Northwest A&F University (2021)

Changes of Water Uptake by Roots and Its Mechanism during the Replacement Process of Dry-land Winter Wheat

牛家昱

Titre : Changes of Water Uptake by Roots and Its Mechanism during the Replacement Process of Dry-land Winter Wheat

Auteur : 牛家昱

Grade : Master 2021

Université : Northwest A&F University

Résumé partiel
Wheat is one of the most important food crops in the world.Wheat production in arid and semi-arid areas is severely restricted by water shortages,which will affect future food security.Winter wheat varieties in the Loess Plateau have undergone a change from ancient farm varieties to modern dwarf wheat varieties,and their productivity has been greatly improved.However,the mechanism has not been studied from the perspective of root growth and water absorption.Therefore,in this experiment,five dryland winter wheat varieties of different ages in the Loess Plateau were used as materials to study their root morphology and anatomical structure,aquaporin expression and hydraulic conductivity changes,and to explore the water absorption capacity of dryland wheat varieties in the replacement of the roots.The change mechanism provides theoretical basis and guidance for dryland winter wheat breeding and optimization of root system architecture and root function to achieve high yield and high efficiency of dryland winter wheat.Main research results :(1)There are obvious differences between the total root length and the primary root length in wheat variety replacement,and there is a slight upward trend in general.Under drought stress conditions,the main radicle,primary root,secondary root and total root length of each variety increased.Under normal water conditions,the root morphological characteristics of the five wheat varieties changed little with the trend of variety replacement.The total root surface area,root dry weight,aerial part dry weight,and root-to-shoot ratio of the five varieties gradually increased with the change of ages.high.Changhan 58 has higher total root length,total surface area and smaller root-to-shoot ratio than other varieties,and shows better adaptability under drought stress

Mots clés : Root Water Absorption ;Hydraulic Conductivity ;TaPIP1;2 ;TaPIP2;5 ;Anatomical Structure ;

Présentation (CNKI)

Page publiée le 19 mars 2022