| Effects of water deficit and high temperature on growth and arabinoxylan concentrations in two different spring wheat varieties |
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| DOI：10.7606/j.issn.1000-7601.2016.01.29 |
| Key Words: wheat gas exchange parameters arabinoxylans yield |
| Author Name | Affiliation | | ZHANG Bei-bei | Key Laboratory of Disaster Survey and Mechanism Simulation of Shaanxi Province/Baoji University of Arts and Sciences, Baoji, Shaanxi 721013, China
State Key Laboratory of Soil Erosion and Dryland farming on Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China | | ZHANG Hui | Key Laboratory of Disaster Survey and Mechanism Simulation of Shaanxi Province/Baoji University of Arts and Sciences, Baoji, Shaanxi 721013, China | | GAN Zhuo-ting | Key Laboratory of Disaster Survey and Mechanism Simulation of Shaanxi Province/Baoji University of Arts and Sciences, Baoji, Shaanxi 721013, China | | ZHOU Qi | Key Laboratory of Disaster Survey and Mechanism Simulation of Shaanxi Province/Baoji University of Arts and Sciences, Baoji, Shaanxi 721013, China | | YI Wen-li | Key Laboratory of Disaster Survey and Mechanism Simulation of Shaanxi Province/Baoji University of Arts and Sciences, Baoji, Shaanxi 721013, China | | LIU Wen-zhao | State Key Laboratory of Soil Erosion and Dryland farming on Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China |
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| Abstract: |
| In this study, effects of drought and heat stress to the two spring wheat growth and quality were investigated. The investigation was conducted in a controlled environment to evaluate the combined effects of water deficit (imposed at the stem elongation stage, 40% field capacity) and high temperature (imposed at the booting stage) on the wheat growth, leaf gas exchange, arabinoxylan concentrations and yields of two spring wheat varieties (‘Superb’ and ‘AC Crystal’) commonly grown in Canada. The temperature treatments were 25℃/15℃(day/night, T1) and 35℃/25℃(T2). Overall, time to maturity under high temperature was 20 days shorter for Superb and 21 days for AC Crystal, indicating that two varieties were more sensitive to high temperature stress. Plant height was sensitive to drought combined high temperature stress for both varieties at booting stage; the plant height of Superb was reduced by 16.7%, while AC Crystal was reduced by 30.6%. At the late growth stage the tillers of AC Crystal was more sensitive to high temperature which was 18.7% higher than that of Superb under appropriate water and temperature condition; Drought and high temperature decreased (P<0.05) leaf gas exchange parameters (Pn of Superb was decreased by 68.9% under drought and high temperature conditions) and the yields but increased the grain arabinoxylan concentrations, especially the water-extractable arabinoxylans (WEAX); High temperature treatment under drought conditions made the WEAX of Superb increased by 49%. The different arabinoxylan fractions were negatively correlated with the leaf gas exchange and yield. |
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