| Effects of nitrogen application rate on NSC accumulation and translocation in stem sheath of spring wheat under drip irrigation |
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| DOI：10.7606/j.issn.1000-7601.2023.05.11 |
| Key Words: spring wheat drip irrigation nitrogen amount stem sheath node fructcan non\|structural carbohydrates |
| Author Name | Affiliation | | CHE Ziqiang | College of Agronomy, Shihezi University, Shihezi, Xinjiang 832000, China | | JIANG Guiying | College of Agronomy, Shihezi University, Shihezi, Xinjiang 832000, China | | WANG Haiqi | College of Agronomy, Shihezi University, Shihezi, Xinjiang 832000, China | | WANG Rongrong | College of Agronomy, Shihezi University, Shihezi, Xinjiang 832000, China | | YIN Haojie | College of Agronomy, Shihezi University, Shihezi, Xinjiang 832000, China |
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| Abstract: |
| In order to clarify the nitrogen response mechanism of fructan and NSC transport to grain under drip irrigation in spring wheat, a split\|plot experiment was conducted with strong sinew wheat ‘Xinchun 37’(XC37) and middle sinew wheat ‘Xinchun 6’(XC6) as the main plots. We examined the effects of nitrogen application rates of 300, 255, 210 kg·hm-2 and 0 kg·hm-2 on the accumulation and transport of fructose and NSC and their contribution to yield at different nodes of stem and sheathe (peduncle internode, penultimate internode, and other internodes) of spring wheat under drip irrigation. The results showed that the activities of sucrose fructosyl transferase (SST), fructan content, NSC content and stem sheath dry matter weight of the two varieties of spring wheat increased first and then decreased, while the activity of exofructan hydrolase (FEH) decreased first and then increased and then decreased，each index had the best performance of 255 kg·hm-2. The activity of fructan metabolizing enzyme, fructan content,NSC content and stem sheath dry matter weight of the other internodes were the highest，and the contribution rate of fructan, NSC and stem sheath dry matter to yield was 11.18%~35.77%,14.77%~45.65% and 25.81%~33.83% higher than that of the penultimate internode, respectively. Compared with XC6, the efficiency of storage material accumulation in stem sheath of XC37 was higher than that of XC6. The contribution rate of fructans, NSC and stem sheath dry matter to yield of XC37 was 32.53%~116.74%, 26.06%~35.26% and 6.32%~21.73% higher than that of XC6, respectively. The interaction effect between nitrogen application rate and variety had significant effects on the preanthesis transport rate and contribution rate of fructan，NSC pre\|flower transport and the contribution rate of dry matter of peduncle internode to yield. In conclusion，the metabolism and yield of fructan and NSC were the best when the nitrogen application level was 255 kg·hm-2，which was the appropriate nitrogen application level for spring wheat under drip irrigation in Xinjiang. |
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