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

Accueil du site → Doctorat → Chine → 2011 → The Response of Water-use Efficiency to Drought, High Temperature, Fungal Inoculation and Other Environments

Northwest University of Science and Technology (2011)

The Response of Water-use Efficiency to Drought, High Temperature, Fungal Inoculation and Other Environments

张蓓蓓; Zhang Zuo Zuo

Titre : The Response of Water-use Efficiency to Drought, High Temperature, Fungal Inoculation and Other Environments

Auteur : 张蓓蓓; Zhang Zuo Zuo

Grade : Doctoral Dissertation 2011

Université : Northwest University of Science and Technology

Résumé partiel
The research of this paper was conducted in drought, high temperature, fungal inoculation and other several different environments to evaluate water use efficiency, photosynthetic characters and other relative items. On the Loess Plateau, (1) 8 varieties were analyzed to see the differences between their water use efficiency, sap flow velocity and gas exchange parameters, (2) using 3 different P levels on another wheat variety Changwu 134 to see the water use efficiency and other characters changes. There were also some experiments conducted in Alberta, Canada, (1) In greenhouse condition, under high temperature and water-deficit treatments the relationship between water use efficiency and arabinoxylan fractions of spring wheat was analyzed ; the fungal inoculation to nutrient uptake and water use efficiency change were also analyzed ; (2) Under drought field conditions, the inoculation of different fungi and different P levels adding were used to measure the differences of the water use efficiency. Those researches of water use efficiency under these several environments and combined the yields and other characters, which is useful to the wheat variety selection and cultivating model. Main results are as follows:1. The results of photosynthetic characters showed that the value of leaf photosynthesis rate at stem elongation stage was higher than that at flowering stage, and the value of leaf transpiration rate at stem elongation stage was also higher than that at flowering stage. For the results of instantaneous WUE, it showed that under the wheat variety experiment the instantaneous WUE was higher at stem elongation stage than that at flowering stage ; but in phosphorus experiment, the instantaneous WUE was a little higher at flowering stage, and the highest value of the WUEi at both stages was under F1 treatment, and it was 3.04 and 3.77 umol CO2/mmol H2O respectively. It showed that adding P could increase the instantaneous WUE. The SPAD of LuoYang 8716 at stem elongation stage was the highest and had significant differences among 8 varieties, and the yield of the LuoYang 8716 and Shaan Mai 893 were the highest. Both the SPAD and the yield of F2 was the highest among 3 different phosphorus treatments.2. The results of the sap flow showed that curves of daily sap flow velocity firstly rose up and then dropped down. In phosphorus experiment, the highest sap flow velocity in a day was 2.796、3.734and 3.873 g/h under F0, F1 and F2 respectively, and the sap flow was increased by the P adding. Radiation had a greater impact on sap flow change during many environment factors. The correlation analysis of time synchronization for sap flow velocity and leaf transpiration rate showed that there was a significant positive correlation between them but had the hysteretic nature of the time, and that maybe because the water capacitance had effect on the water movement.3. Under a controlled environment of water-deficit (imposed at the stem elongation stage) and high temperature (imposed at the booting stage), the water use efficiency (WUE) and arabinoxylan concentration of two spring wheat varieties (‘Superb’and‘AC Crystal’) were analyzed. The temperature treatments were 22/12 (day/night) and 32/22℃. Overall, time to maturity under high temperature was 10 days shorter for‘Superb’than for‘AC Crystal’, indicating that‘Superb’was more sensitive to high temperature stress.

Mots clés : wheat; water use efficiency; gas exchange; sap flow; carbon isotope discrimination; yield;

Présentation (CNKI)

Page publiée le 3 mai 2013, mise à jour le 16 mai 2018