云南农业大学学报（自然科学）2018，Vol.33Issue(5)：790-796,7.DOI:10.12101/j.issn.1004-390X(n).201801045
不同氮素水平下追氮时期对小麦淀粉粒度分布的影响
Effects of Nitrogen Topdressing Stages on the Starch Granule Size Distribution in Wheat Grains under Different Nitrogen Rates
摘要
Abstract
[Purpose]The objective of this study was to investigate the effects of nitrogen topdressing on the starch granule size distribution in wheat grains.[Method]Two wheat cultivars, Aikang58 (A58) and Shannong 22 (S22) were used in this study. A fertilizer experiment was designed with different nitrogen topdressing stages under two nitrogen rates of 120 kg/hm2 and 240 kg/hm2.[Result]The starch content in grain of nitrogen topdressing at the jointing stage was significantly lower than that of nitrogen topdressing at the returning green stage (P<0.05), but the starch accumulation in grain of nitrogen topdressing at the jointing stage was significantly higher than that of nitrogen topdressing at the returning green stage under the same nitrogen rate (P<0.05). Compared with the treatment of nitrogen topdressing at the returning green stage, the average particle size of starch granules at jointing stage decreased, meanwhile the volume and surface area percentage of B type starch granules increased observably at the nitrogen rate of 120 kg/hm2. The average particle size of starch granules of nitrogen topdressing at jointing stage significantly increased (P<0.05), meanwhile the volume and surface area percentage of A type starch granules increased observably at the nitrogen rate of 240 kg/hm2. There was no significant effect of nitrogen rate and nitrogen topdressing stage on the number distribution of starch granules in wheat grains (P>0.05).[Conclusion]The delay of nitrogen topdressing increased the volume percentage of B type starch granules under the low nitrogen rate, and hence benefit to the accumulation of starch in grains. The delay of nitrogen topdressing was beneficial to the accumulation of A type starch granules in grains, and hence benefit to the accumulation of starch under the suitable nitrogen rate.关键词
小麦/氮素/追氮时期/淀粉粒Key words
wheat/nitrogen/nitrogen topdressing stage/starch granule分类
农业科技引用本文复制引用
吴培金,闫素辉,张从宇,邵庆勤,许峰,李文阳..不同氮素水平下追氮时期对小麦淀粉粒度分布的影响[J].云南农业大学学报（自然科学）,2018,33(5):790-796,7.基金项目
国家重点研发计划(2016YFD0300408,2017YFD0301301) （2016YFD0300408,2017YFD0301301）
安徽科技重大专项项目(160307001102) （160307001102）
安徽自然科学基金项目(1408085QC54). （1408085QC54）
