外源氮引发对白羊草种子萌发特性的影响

doi:10.12160/j.issn.1672-5190.2023.03.012

摘要/Abstract

摘要：

[目的]探究外源氮引发对白羊草（Bothriochloa ischaemum）种子萌发特性的影响。[方法]以白羊草种子为试验材料，分别采用不同浓度（0、70、140、280、560、1 120 mmol/L）的NH₄NO₃溶液引发0（CK）、3、6、9、12 h后，分析种子发芽率、发芽指数、平均发芽时间及幼苗活力指数的变化，揭示白羊草种子萌发对外源氮引发的响应。[结果]氮浓度、引发时间及二者的交互作用对白羊草种子发芽率、发芽指数、平均发芽时间及幼苗活力指数均具有极显著（P<0.01）的影响。白羊草种子发芽率、发芽指数和幼苗活力指数在NH₄NO₃溶液浓度为0~140 mmol/L时呈上升趋势，在NH₄NO₃浓度为280~1 120 mmol/L时呈下降趋势，而平均发芽时间的变化趋势与之相反。[结论]白羊草种子萌发能力在低浓度（≤140 mmol/L）NH₄NO₃溶液引发时升高，在高浓度（≥280 mmol/L）NH₄NO₃溶液引发时降低。浓度为140 mmol/L引发6 h是生产实践中应用NH₄NO₃溶液对白羊草种子进行氮引发的最佳处理。

关键词: 白羊草, 种子萌发, 氮沉降, 氮引发, 种子活力

Abstract:

[Objective] This study aimed to explore the effects of exogenous nitrogen priming on seed germination characteristics of Bothriochloa ischaemum. [Method] The Bothriochloa ischaemum seeds were used as experimental materials. After priming with different concentrations （0, 70, 140, 280, 560, 1 120 mmol/L） of NH₄NO₃ solution for 0 （CK）, 3, 6, 9, and 12 h, respectively, the changes in seed germination rate, germination index, mean germination time, and seedling vigor index were analyzed to reveal the responses of Bothriochloa ischaemum seed germination to exogenous nitrogen priming. [Result] Nitrogen concentration, priming time and their interaction had extremely significant （P<0.01） effects on the seed germination rate, germination index, mean germination time, and seedling vigor index of Bothriochloa ischaemum. The seed germination rate, germination index, and seedling vigor index of Bothriochloa ischaemum showed an upward trend when the concentrations of NH₄NO₃ solution ranged from 0 to 140 mmol/L, and exhibited a downward trend when the concentrations of NH₄NO₃ solution ranged from 280 to 1 120 mmol/L, while the change trend of mean germination time was the opposite. [Conclusion] The seed germination ability of Bothriochloa ischaemum was improved with the lower concentrations （≤140 mmol/L） of NH₄NO₃ solution priming, and was inhibited with the higher concentrations （≥280 mmol/L） of NH₄NO₃ solution priming. The optimal treatment for Bothriochloa ischaemum seeds was priming with NH₄NO₃ solution at concentration of 140 mmol/L for 6 h in production practice.

Key words: Bothriochloa ischaemum, seed germination, nitrogen deposition, nitrogen priming, seed vigor

中图分类号:

S543.904

李尹琳, 毕铭, 夏方山, 王聪聪, 曾佳. 外源氮引发对白羊草种子萌发特性的影响[J]. 畜牧与饲料科学, 2023, 44(3): 83-88.

LI Yinlin, BI Ming, XIA Fangshan, WANG Congcong, ZENG Jia. Effects of Exogenous Nitrogen Priming on Seed Germination Characteristics of Bothriochloa ischaemum[J]. Animal Husbandry and Feed Science, 2023, 44(3): 83-88.

图/表 5

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