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| Root carbon consumption and grain yield of spring wheat in response to phosphorus supply under two water regimes |
| GUAN Yu1, 2, QIAO Zhen2, DU Jiu-yuan3, DU Yan-lei2 |
1 Department of Resource and Environmental Science, Agronomy College, Shihezi University, Shihezi 832000 P.R.China
2 State Key Laboratory of Grassland Agro-ecosystem, Institute of Arid Agroecology, School of Life Sciences, Lanzhou University, Lanzhou 730000, P.R.China
3 Institute of Wheat, Gansu Academy of Agricultural Sciences, Lanzhou 730070, P.R.China |
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Abstract In semiarid areas, cereal crops often allocate more biomass to root at the expense of aboveground yield. A pot experiment was conducted to investigate carbon consumption of roots and its impact on grain yield of spring wheat (Triticum aestivum L.) as affected by water and phosphorus (P) supply. A factorial design was used with six treatments namely two water regimes (at 80–75% and 50–45% field capacity (FC)) and three P supply rates (P1=0, P2=44 and P3=109 µg P g–1 soil). At shooting and flowering stages, root respiration and carbon consumption increased with the elevate of P supply rates, regardless of water conditions, which achieved the minimum and maximum at P1 under 50–45% FC and P3 under 80–75% FC, respectively. However, total aboveground biomass and grain yield were higher at P2 under 80–75% FC; and decreased with high P application (P3). The results indicated that rational or low P supply (80–75% of field water capacity and 44 mg P kg–1 soil) should be recommended to improve grain yield by decreasing root carbon consumption in semiarid areas.
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Received: 17 June 2015
Accepted:
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| Fund: This research was supported by the National Nature Science Foundation of China (31300328, 31200335, 31470496), the “111” Program from State Administration of Foreign Experts Affairs (SAFEA) & Ministry of Education (MOE), China (2007B051), the Fundamental Research Funds for the Central Universities, China (lzujbky-2012-97, lzujbky-2015-ct02, lzujbky-2016-86), and the funding from the State Key Laboratory of Grassland Agro-ecosystem in Lanzhou University, China. |
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Corresponding Authors:
DU Yan-lei, Tel/Fax: +86-931-8912848,
E-mail: yanleidu@lzu.edu.cn
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Cite this article:
GUAN Yu, QIAO Zhen, DU Jiu-yuan, DU Yan-lei.
2016.
Root carbon consumption and grain yield of spring wheat in response to phosphorus supply under two water regimes. Journal of Integrative Agriculture, 15(7): 1595-1601.
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