Scientia Agricultura Sinica ›› 2013, Vol. 46 ›› Issue (21): 4416-4426.doi: 10.3864/j.issn.0578-1752.2013.21.003

• SPECIAL FOCUS: STUDIES ON CLIMATE CHANGE IMPACT ON CROP AND ANIMAL PRODUCTION FROM CHINA • Previous Articles     Next Articles

Quantifying the Effects of Low Level of Radiation After Anthesis on Yield Components and Grain Quality of Weak Gluten Wheat

 GU  Yun-Qian-1, LIU  Xue-1, ZHANG  Wei-1, QI  Chun-Jie-1, TANG  Kai-Lei-1, ZHAO  Yang-1, ZHANG  Yan-1, LI  Gang-1, WANG  Bin-1, ZHAO  Chun-Jiang-2, ZHOU  Jian-Min-3, LUO  Wei-Hong-1   

  1. 1.College of Agriculture, Nanjing Agricultural University, Nanjing 210095
    2.National Engineering Research Center for Information Technology in Agriculture, Beijing 100089
    3.Jiangsu Province Key Laboratory of Grain and Oil Quality Control and Deep Processing, Nanjing University of Finance and Economics, Nanjing 210046
  • Received:2013-05-22 Online:2013-11-01 Published:2013-07-11

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Abstract: 【Objective】The objective of this study is to develop a model for predicting the effects of low level of radiation on yield components and grain quality of wheat so as to quantitatively assess the impacts of low level of radiation on wheat crop production.【Method】Field experiments with weak gluten winter wheat (Triticum aestivum L. cv Yangmai 15) were conducted during three growing seasons. Shading treatments with three levels of radiation intensity (50%, 34% and 16% of natural radiation) and four durations (2 d, 4 d, 6 d and 8 d) after anthesis in the three growing seasons were designed to simulate the low level of radiation caused by cloudy or rainy weather conditions. Based on the experimental data, the impacts of low level of radiation on yield components and grain nitrogen accumulation, and their relations with grain quality traits were quantitatively analyzed and the corresponding functions were determined. These functions were then integrated into the simulation model of wheat crop biomass production and under low levels of radiation weather conditions developed in a previous study, to develop a dynamic model for predicting the effects of low level of radiation after anthesis on the yield components and grain quality of weak gluten wheat. Independent experimental data were used to validate the model.【Result】The critical daily total photosynthetically active radiation (PAR) and duration were determined for keeping normal levels of grain number per spike and grain nitrogen content based on the experimental data. Model validation results showed that the determination coefficient (R2) between the predicted and measured values of grain number per spike, thousand grain weight, test weight, falling number, protein content and wet gluten content were 0.89, 0.75, 0.72, 0.73, 0.93 and 0.84, respectively, and the corresponding relative root mean squared errors (rRMSE) were 2.86%, 3.41%, 1.01%, 2.50%, 2.64% and 5.05%, respectively.【Conclusion】The model developed in this study gave satisfactory predictions of the effects of low level of radiation after anthesis on yield components and grain quality of weak gluten wheat, hence, can be used for assessing the impacts of low level of radiation caused by cloudy or rainy weather conditions on weak gluten wheat production.

Key words: weak gluten wheat , low level of radiation , yield components , grain quality , model

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