| Relationship between wax content and physiological characters of winter wheat during different ages |
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| DOI：10.7606/j.issn.1000-7601.2013.05.036 |
| Key Words: winter wheat wax content cultivars replacement phys |
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| Abstract: |
| In order to clarify the relationship between wax accumulation and physiological characters of winter wheat cultivars bred at different eras under different water treatments, six representative winter wheat cultivars were selected from the central Henan in different period to study wax content and gas exchanging parameter etc. Three irrigation levels were consisted with the following water treatmen
ts: no irrigation after returning green stage (W0), one irrigation at jointing stage (W1), two irrigations at jointing and milky stage respectively (W2). The results showed there were significant negative correlations among wax content of leaf and photosynthesis rate, transpiration rates, leaf water potential and grain yield. There were significant positive correlation between wax content and leaf temperature. There was no significant correlation with WUE of leaf and WUE of grain yield. The wax content of flag leaf of winter wheat increased first and decreased later with years. The wax content of winter cultivars bred in 1970s and 1980s improved by 14.9%～86.9% than other age ultivars. The decrease in grain yield of winter wheat bred in 1970s and 1980s was from 6.8% to 22.0% than bred after 1990s. The decrease in leaf WUE of winter wheat bred in 1970s and 1980s was from 11.8% to 17.9% than other cultivars. The decrease in WUE of yield of winter wheat bred in1970s and 1980s was from 11.8% to 17.9% than bred after 1990s. Accumulation wax on leaf blade under water stress was lower. The photosynthetic rate and the CO2 assimilation products declined at water stress so that the grain yield declined. |
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