植物营养与肥料学报2016，Vol.22Issue(5)：1177-1186,10.DOI:10.11674/zwyf.15355
甬优系列籼粳杂交稻氮素积累与转运特征
Characteristics of nitrogen uptake, utilization and translocation in the indica-japonica hybrid rice of Yongyou series
摘要
Abstract
Objectives]The objective of this study was to evaluate the nitrogen (N) uptake, utilization efficiency and translocation of the indica-japonica hybrid rice of Yongyou series and to identify the characteristics of their relationship with yield formation.[Methods]Seven indica-japonica hybrid rice of Yongyou series cultivars, two japonica rice cultivars and two hybrid indica rice cultivars were used as experimental material in 2013–2014. The characteristics of N content and N accumulation at the main growth stages, periodical N accumulation and periodical N uptake rate, N contents and ratios of N accumulation and translocation at the heading and maturity stages, N utilization efficiency were analyzed systematically.[Results]The N content and N accumulation of indica-japonica hybrid rice of Yongyou series were 1.47% and 202.67 kg/hm2in heading stage, 1.31% and 257.23 kg/hm2in maturity stage, which were higher than other two control types. The highest periodical N accumulation was 107.63 kg/hm2, with the highest proportion in total and periodical N uptake rate of 41.84% and 2.73 kg/(hm2·d) for the indica japonica cultivars in jointing to heading stage. The N contents of stem-sheath and leaf were 1.19% and 2.34% in heading stage, 0.75% and 1.58% in maturity stage, which were higher than other two control types. The proportions of N accumulation in stem-sheath and leaf were 43.92% and 43.87%in heading stage, 16.44% and 17.44% in maturity stage, which were significantly larger than the hybrid indica rice. The N translocation amount was larger, but the apparent transport rate and transport contribution rate were low, and net N absorbed conversion rate after heading was 32.06%, which was significantly higher than the two contrast types. N uptake per 100 kg of grain was 2.29 kg and partial factor productivity of applied N was 37.54 kg/kg, which were higher than the two control types. N utilization efficiency for grain, N utilization efficiency for biomass production and N harvesting index were lower.[Conclusions]The indica-japonica hybrid rice of Yongyou series accumulate enough N at transplanting-jointing stage, and increase the proportion of jointing-heading stage and heading-maturity stage. The N translocation amount in the stem-sheath and leaves from the heading to the maturity of the indica-japonica hybrid rice of Yongyou series is large. But the apparent N translocation rate and N translocation conversion rate are low. The advantage of net N accumulation after heading stage is obvious, which can meet the demand for N in grain.关键词
籼粳杂交稻/甬优系列/氮素/积累/转运/利用效率Key words
the indica-japonica hybrid rice/Yongyou series/nitrogen/accumulation/translocation/utilization efficiency分类
农业科技引用本文复制引用
李超,郭保卫,韦还和,许俊伟,王子杰,许轲,张洪程,戴其根,霍中洋,魏海燕..甬优系列籼粳杂交稻氮素积累与转运特征[J].植物营养与肥料学报,2016,22(5):1177-1186,10.基金项目
国家重点研发计划（2016YFD0300502，2016YFD0300507）；公益性行业（农业）科研专项（201303102）；江苏省农业自主创新基金项目（CX151002）；江苏省农业三新工程项目（SXGC 2014315）资助。 （）
