Nitrogen fertiliser rate and post-anthesis waterlogging effects on carbohydrate and nitrogen dynamics in wheat |
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Authors: | Dong Jiang Xuemei Fan Tingbo Dai Weixing Cao |
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Institution: | (1) Key Laboratory of Crop Growth Regulation of Ministry of Agriculture/Key Laboratory of Information Agriculture of Jiangsu Province, Nanjing Agricultural University, Nanjing, 210095, China;(2) College of Agriculture, Nanjing Agricultural University, No. 1 Weigang Road, Nanjing, Jiangsu, 210095, China |
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Abstract: | Waterlogging is predicted to increase in both magnitude and frequency along with global warming, and will become one of the
most severe adversities for crop production in many regions. Nitrogen is considered to be an effective up-regulatory nutrient
for crops grown under stress and non-stress conditions. In this study, we try to evaluate N fertiliser effects on contents
of carbohydrate and N dynamics, dry matter accumulation in shoot, yield under post-anthesis waterlogging. Waterlogging after
anthesis significantly reduced grain yield due to decrease in thousand-kernel-weight and in grain number per spike. High N
fertiliser application aggravated grain yield loss due to post-anthesis waterlogging. These yield losses were related to the
decreases in dry matter accumulation, redistribution of stored photosynthate to the grain, and the conversion capacity from
carbohydrate to starch in grain. The decrease in dry matter accumulation could be attributed to the reduced activities of
Pn (photosynthesis) and SPS (sucrose phosphate synthase) in the flag leaf, while the low capacity in starch synthesis could
be explained by the reduced activities of sucrose synthase (SS) and soluble starch synthase (SSS) in grain. Total N uptake
in shoot was also reduced, which could contribute to the losses in biomass and yield by waterlogging. The decrease in Pn was
inconsistent with the increase in N content in the flag leaf at high N fertiliser application under post-anthesis waterlogging. |
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Keywords: | Dry matter distribution Enzyme activity Photosynthesis Sink– source relationship Starch Winter wheat |
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