Application of Nitrogen Fertilizer at Heading Stage Improves Rice Quality under Elevated Temperature during Grain-Filling Stage

By Zhi Dou, She Tang, Ganghua Li, Zhenghui Liu, Chengqiang Ding, Lin Chen, Shaohua Wang, Yanfeng Ding. 2017

88 citations recorded by the source corpus.

Global warming would deteriorate rice (Oryza sativa L.) quality, especially chalk characteristic. To better cope with the challenges from global warming, the effects of nitrogen (N) fertilizer at heading stage on rice quality under elevated temperature during grain-filling stage were investigated. Four different growth regimes, including no warming without N fertilizer at heading stage (CK), elevated temperature without N fertilizer at heading stage (ET), elevated temperature with N fertilizer at heading stage (ET+N), no warming with N fertilizer at heading stage (CK+N), were conducted. Elevated temperature during grain filling was achieved by a free-air temperature enhancement facility with the increase of 4°C in ET and 3.7°C in ET+N. Results showed that elevated temperature decreased rice appearance quality and cooking quality and increased rice nutritional quality and eating quality. Grain-filling rate and amyloplast development for both superior and inferior spikelets were obviously accelerated during early grain-filling stage by elevated temperature. The application of N fertilizer at heading stage could inhibit the deterioration of rice quality, particularly for chalk performance, and may be associated with the alleviation of grainfilling rate and amyloplast development. The above evidence indicated that the application of N fertilizer at heading stage is efficient to mitigate rice quality deterioration under higher temperatures in the Yangtze River Valley. Z. Dou, S. Tang, G. Li, Z. Liu, C. Ding, L. Chen, S. Wang, and Y. Ding, College of Agronomy, Nanjing Agricultural Univ., Nanjing 210095, PR China; S. Tang, G. Li, Z. Liu, C. Ding, L. Chen, S. Wang, and Y. Ding, Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing 210095, PR China. Received 18 May 2016. Accepted 1 Apr. 2017. *Corresponding authors (tangshe@njau.edu.cn, dingyf@njau.edu.cn). Assigned to Associate Editor Lee Tarpley. Abbreviations: CK, no warming without nitrogen fertilizer at heading stage; CK+N, no warming with N fertilizer at heading stage; DP, degree of polymerization; ET, elevated temperature without nitrogen fertilizer at heading stage; ET+N, elevated temperature with nitrogen fertilizer at heading stage; FATE, free-air temperature enhancement; IS, inferior spikelet; NFHS, nitrogen fertilizer at heading stage; RVA, rapid viscosity analyzer; SEM, scanning electron microscopy; SS, superior spikelet; Tmax, the time to reach a maximum grain-filling rate. Published in Crop Sci. 57:2183–2192 (2017). doi: 10.2135/cropsci2016.05.0350 © Crop Science Society of America | 5585 Guilford Rd., Madison, WI 53711 USA This is an open access article distributed under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Published May 11, 2017

Subfields: Nutrition and Dietetics, Plant Science

View Paper: https://www.semanticscholar.org/paper/6454f35924e012e96219b78f54f8a982ee699fab