Different types of N nutrition and their impact on endogenous cytokinin levels in Festulolium and Trifolium pratense L.
Different types of N nutrition and their impact on endogenous cytokinin levels in Festulolium and Trifolium pratense L.
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DOI：
10.17221/152/2011-pse
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发表时间：
2011-01-01
影响因子：
2.4
通讯作者：
Pavlik, M.
中科院分区：
文献类型：
--
作者：
Neuberg, M.;Pavlikova, D.;Pavlik, M.
本研究旨在揭示和比较两种不同氮素营养体系（侧施和注施）对NH 4+及其混合营养的毒性效应。研究了NH_4 ~+或混合（NH_4NO_3）施用对水稻内源细胞分裂素（CK）和全株氮素水平的影响及其对产量的影响。盆栽试验以硫酸铵和硝酸铵为氮源。试验结果表明，在相同的条件下，紫花苜蓿和红车轴草的产量最高，其次为紫花苜蓿和红车轴草。与注射施用相比，侧施两种铵源后地上生物量和根系更显著地增加。结果表明，CK在植物体内的积累量与其氮含量呈显著正相关（R ~（-2）= 0.66-0.98）。施氮后，CK各形态间的比例保持相对稳定，其动态变化趋势相似。结果表明，NO3-的存在可以有效地调节NH 4+对羊茅和三叶草生长的负面影响。
This study aims to reveal and to compare effects of two different systems of nitrogen (N) nutrition (sidedress application or injection application) on toxicity of NH4+ and mixed nutrition. We investigated whether NH4+ or mixed (NH4NO3) application causes significant changes in the endogenous levels of cytokinins (CK), whole plant N and their effects on yield of selected plants. Ammonium sulphate or ammonium nitrate were used as N source in the pot experiment. The yield of Festulolium and Trifolium pratense L. above-ground biomass and roots was more substantially enhanced after sidedress application of both ammonium sources in comparison with injection application. Our results confirmed that the accumulation of CKs in plants is in correlation with their N content (R-2 = 0.66-0.98). Proportions between individual CK forms remained relatively steady and their dynamics exhibited similar trends after N application. Our results indicate that the negative effect of the application of NH4+ on the growth of Festulolium and clover plants could be effectively modulated by the presence of NO3-.