Effects of plant density on grain yield,protein size distribution,and breadmaking quality of winter wheat grown under two nitrogen fertilisation rates |
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| Institution: | 1. National Key Lab. of Crop Biology, Collaborative Innovation Team of Shandong Wheat–Corn Crops, Key Lab. of Crop Ecophysiology and Farming System, Ministry of Agriculture, Agronomy College of Shandong Agricultural University, Tai’an 271018, Shandong, PR China;2. Life Science and Technology College, Nanyang Normal University, Nanyang 473061, Henan, PR China;3. College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei, PR China;1. Center for Resources, Environment and Food Security, China Agricultural University, Beijing 100193, China;2. Collaborative Innovation Team of Shandong Wheat-Corn Crops, National Key Lab. of Crop Biology, Key Lab. of Crop Ecophysiology and Farming System, Ministry of Agriculture, Agronomy College of Shandong Agricultural University, Tai’an 271018, Shandong, China;1. State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A&F University, Yangling 712100, Shaanxi, China;2. Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Ministry of Agriculture, College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China;1. National Technique Innovation Center for Regional Wheat Production/Key Laboratory of Crop Physiology and Ecology in Southern China, Ministry of Agriculture/National Engineering and Technology Center for Information Agriculture, Nanjing Agricultural University, PR China;2. National Laboratory of Plant Genetics and Germplasm Enhancement, Nanjing Agricultural University, PR China;3. Department of Molecular Biology and Genetics, Section of Crop Genetics and Biotechnology, Aarhus University, Denmark;1. INIA La Estanzuela, Colonia, CP 70000, Uruguay;2. University of Agricultural Sciences, Department of Plant Breeding, PO Box 101, SE-230 53, Alnarp, Sweden;1. National Key Lab. of Crop Biology, Key Lab. of Crop Ecophysiology and Farming System, Ministry of Agriculture, Agronomy College of Shandong Agricultural University, Tai’an 271018, Shandong, PR China;2. Dezhou Academy of Agricultural Sciences, Dezhou 253015, Shandong, PR China |
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| Abstract: | Nitrogen (N) and plant density are two crucial factors that affect winter wheat (Triticum aestivum L.) yield and quality, but little is known regarding the effects of interactions between these two factors on the amount and size distribution of protein fractions and quality traits. We grew the bread wheat cultivar Jinan17 in two successive seasons (2012–2013 and 2013–2014) at three densities of 120 plants m?2 (low), 180 plants m?2 the usual rate for a multiple-spike cultivar with high tillering ability in the North China Plain (NCP)], and 240 plants m?2 (high) and two levels of N fertilisation of 0 (low N availability treatment without N fertilisation) and 240 kg ha?1 (the usual N rate for winter wheat production in the NCP) to evaluate the effect of N level × plant density interaction on grain yield, grain protein concentration, the amount and composition of protein fractions, dough development time, dough stability time, and loaf volume. The effect of plant density on Jinan 17 grain yield and quality differed between the two N levels. As plant density increased, all the parameters listed above decreased under 0 kg ha?1 N fertilisation, but increased under 240 kg ha?1 N fertilisation. Stepwise regression analysis showed that the dough rheological properties and breadmaking quality of Jinan 17 were affected by plant density under both N levels, primarily through changes in the polymerisation degree of glutenins in the flour. |
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| Keywords: | N level Plant density Grain protein concentration Polymerisation index Breadmaking quality |
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