N-15 tracer-based analysis of genotypic differences in the uptake and partitioning of N applied at different growth stages in transplanted rice
N-15 tracer-based analysis of genotypic differences in the uptake and partitioning of N applied at different growth stages in transplanted rice
复制标题
基于N-15示踪剂的移栽水稻不同生长阶段氮素吸收和分配的基因型差异分析
DOI：
10.1016/j.fcr.2017.06.017
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发表时间：
2017
影响因子：
5.8
通讯作者：
Zhang Xiufu
中科院分区：
文献类型：
--
作者：
Wang Danying;Xu Chunmei;Yan Jinxiang;Zhang Xiaoguo;Chen Song;Chauhan Bhagirath S.;Wang Lei;Zhang Xiufu
氮肥分次施用是水稻生产中最常用的氮肥管理方式。为研究水稻不同生育期对肥料氮的吸收和累积氮在移栽水稻中的分配，采用裂区设计，在3个不同肥料氮利用率（FNREs）的水稻品种上进行了2年的田间试验，试验设2个施氮量（105和210 kg ha−1）和3个15 N标记肥料处理。测定了总肥料的FNRE，并通过施用15 N标记尿素作基肥、分蘖肥和穗肥，分析了基肥、分蘖肥和穗肥的FNRE。虽然穗部FNRE（32%~ 68%）大于基肥和分蘖肥的FNRE（分别为10%~ 36%和13%~ 42%），但肥料总量FNRE与基肥和分蘖肥FNRE均呈极显著正相关（p <0.01）。与低FNRE品种相比，高FNRE品种吸收更多的底肥-N，并且在抽穗时茎和成熟时穗中的底肥-N和底肥-N的百分比显著更大。FNRE高的品种分蘖发生早、快，且FNRE与分蘖率呈显著正相关。上述结果表明，基施氮量的差异是造成FNRE基因型差异的重要原因，在生育前期分蘖快的品种中可选育出FNRE高的品种。
Nitrogen (N) fertilizer split-application is the most widely adopted N management in rice production. To investigate the genotypic differences in the uptake of fertilizer-N applied at different growth stages and in the partitioning of accumulated N in transplanted rice, a two-year field experiment using a split–split plot design with two N rates (105 and 210 kg ha−1) and three15N-labelled fertilizer application treatments was conducted in three rice varieties with different fertilizer-N recovery efficiencies (FNREs). The FNRE of total fertilizer was measured, and the FNREs of basal, tillering and panicle fertilizations were analyzed by applying15N-labelled urea as basal, tillering or panicle fertilizer. Although the panicle-FNRE (32%-68%) was greater than the FNREs of both basal and tillering fertilizers (10%–36% and 13%–42%, respectively), the FNRE of total fertilizer was significantly and positively correlated with both basal and tillering-FNREs (p <0.01). The high-FNRE varieties absorbed more basal fertilizer-N compared with the low-FNRE variety and had significantly greater basal-FNRE and percentages of basal fertilizer-N in the stems at heading and in the panicles at maturity. Early and quick tillering emergence was observed in the high-FNRE varieties, and there was a significant positive relationship between basal-FNRE and tillering rate. The above results indicate that the difference in basal fertilizer-N absorption plays an important role in the genotypic difference in FNRE, and high-FNRE varieties might be selected from the varieties characterized by fast tillering in the early growth stages.