| 甬优中熟籼粳杂交稻栽后植株氮素积累模型与特征 |
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| 基金项目： | This study was supported by the National Natural Science Foundation of China(31901448);the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(19KJB210004);the Priority Academic Program Development of Jiangsu Higher Education Institutions. |
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| 摘 要： | 旨在定量描述甬优中熟籼粳杂交稻栽后植株氮素养分积累动态变化,基于模型分析方法从氮素营养层面阐明甬优中熟籼粳杂交稻高产形成机制。2015—2016年,以甬优中熟籼粳杂交稻甬优2640和甬优1640、常规粳稻扬粳4038和扬粳4227、杂交籼稻新两优6380和扬两优6号为试材,比较研究其栽后植株氮素积累特征差异。籼粳杂交稻两年平均产量达11.65 t hm~(–2),显著高于常规粳稻(10.74 t hm~(–2))和杂交籼稻(10.01 t hm~(–2))。成熟期植株氮素吸收量和百千克籽粒吸氮量亦高于常规粳稻和杂交籼稻。成熟期植株各器官氮素吸收量及其所占比例,籼粳杂交稻以穗部最多,叶片其次,茎鞘最少;常规粳稻和杂交籼稻则均以穗部最多,茎鞘其次,叶片最少。与常规粳稻和杂交籼稻相比,籼粳杂交稻成熟期叶片氮素吸收量占植株总吸氮量的比例较高,穗部氮素吸收量所占比例则较低。不同类型品种栽后植株氮素积累动态均以Gompertz方程拟合效果较好,拟合系数一般在0.995左右。与常规粳稻和杂交籼稻相比,甬优中熟籼粳杂交稻在各阶段氮素积累量均具优势,在快增期是由于其较高的持续天数和氮素积累速率,渐增期和缓增期是由于其较高的氮素积累速率。本文提出了符合不同类型水稻栽后植株群体氮素积累动态变化特征的Gompertz模型,并采用该模型分析了甬优中熟籼粳杂交稻栽后植株氮素积累优势。
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| 收稿时间： | 2019-08-29 |
A dynamic model and its characteristics for nitrogen accumulation after transplanting in medium-maturity types of Yongyou japonica/indica hybrids |
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| Authors: | Tian-Yao MENG Jia-Lin GE Xu-Bin ZHANG Huan-He WEI Yu LU Xin-Yue LI Yuan TAO En-Hao DING Gui-Sheng ZHOU Qi-Gen DAI |
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| Institution: | 1.Joint International Research Laboratory of Agriculture and Agro-product Safety, Ministry of Education / Institute of Agricultural Science and Technological Development, Yangzhou University, Yangzhou 225009, Jiangsu, China;2.Jiangsu Key Laboratory of Crop Genetics and Physiology / Jiangsu Key Laboratory of Crop Cultivation and Physiology / Jiangsu Co-innovation Center for Modern Production Technology of Grain Crops / Agricultural College of Yangzhou University, Yangzhou 225009, Jiangsu, China |
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| Abstract: | In order to quantitatively describe the dynamics of nitrogen accumulation after transplanting of medium-maturity types of Yongyou japonica/indica hybrids (MJIH), and to elucidate the mechanism of high yield based on modelling methods, MJIH Yongyou 2640 and Yongyou 1640, japonica conventional rice (JC) Yangjing 4038 and Yangjing 4227, and indica hybrid rice (IH) Xinliangyou 6380 and Yangliangyou 6 were used to compare the differences in nitrogen uptake characteristics after transplanting in 2015 and 2016. Grain yield of MJIH averaged 11.65 t hm -2 across two years, significantly higher than JC (10.74 t hm -2) and IH (10.01 t hm -2). Similar trends were also observed in nitrogen accumulation amount at maturity and nitrogen accumulation per 100 kg grain. For MJIH, the nitrogen accumulation and its ratio to total nitrogen accumulation at maturity was the highest in panicle, the medium in leaf, and lower in stem. For JC and IH, the nitrogen accumulation and its ratio to total nitrogen accumulation at maturity was the highest in panicle, the medium in stem, and lower in leaf. Compared with JC and IH, MJIH had higher ratio of leaf nitrogen accumulation, while lower ratio of panicle nitrogen accumulation to total nitrogen accumulation at maturity. There was a good fitness between Gompertz equation and dynamics of nitrogen accumulation of rice varieties in our study. Compared with JC and IH, MJIH had higher nitrogen accumulation amount in the early, middle and late nitrogen accumulation stages, which was due to long time of accumulation and higher accumulation rate in the middle stage, and higher nitrogen accumulation rate in the early and late stages. This study applied Gompertz equation to simulate the dynamics in nitrogen accumulation after transplanting of different rice varietal groups, and analyze the superiority of nitrogen accumulation of MJIH based on Gompertz equation. |
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| Keywords: | Yongyou japonica/indica hybrids medium-maturity types nitrogen accumulation Gompertz equation |
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