Influence of light intensity on the responses of seedlings of neotropical tree species to nitrogen source

IF 4.5 2区 生物学 Q2 ENVIRONMENTAL SCIENCES
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Abstract

Light intensity plays a crucial role in N uptake and assimilation in plants, but its interaction with different N sources is overlooked. Considering the high energy required for N assimilation, it is hypothesised that low light is critical for the seedling development with both N sources, but with increased light intensity, growing with nitrate (NO3-) becomes favourable in relation to ammonium (NH4+). Seedlings of Cecropia pachystachya (pioneer), Guarea kunthiana (shade-tolerant, understory) and Cariniana estrellensis (shade-tolerant, canopy) were grown in hydroponic medium with NO3- or NH4+ as the sole N source and subjected to low (LL) or high light (HL) for 60 days. All three species showed a decrease in growth when cultivated with NH4+, compared to NO3-, under HL, but not under LL. The decrease in biomass reached 54 % in C. pachystachya, 36 % in G. kunthiana and 26 % in C. estrellensis. Growth reduction was associated with stomatal limitation of photosynthesis and reduced leaf area in C. pachystachya, and with non-stomatal limitation of photosynthesis and oxidative stress in G. kunthiana. Cation uptake was negatively affected by NH4+ in all species. Cariniana estrellensis showed no photosynthetic limitation and showed a higher tolerance to NH4+ under HL in terms of nutrient content. In conclusion, neither N source significantly favors seedling development under LL, while NH4+ is considerably more unfavorable for seedling development than NO3- under HL.
光照强度对新热带树种幼苗对氮源反应的影响
光照强度对植物的氮吸收和同化起着至关重要的作用,但其与不同氮源的相互作用却被忽视了。考虑到氮同化所需的高能量,假设低光照对两种氮源的幼苗生长都至关重要,但随着光照强度的增加,硝酸盐(NO3-)的生长相对于铵(NH4+)的生长更为有利。将 Cecropia pachystachya(先锋植物)、Guarea kunthiana(耐阴植物,林下植物)和 Cariniana estrellensis(耐阴植物,冠层植物)的幼苗培育在以 NO3- 或 NH4+ 为唯一氮源的水培培养基中,并将其置于弱光(LL)或强光(HL)下 60 天。与 NO3- 相比,在高光照条件下使用 NH4+ 栽培时,所有三个物种的生长都有所下降,但在低光照条件下则没有。C. pachystachya 的生物量减少了 54%,G. kunthiana 减少了 36%,C. estrellensis 减少了 26%。生长下降与 C. pachystachya 的光合作用气孔限制和叶面积减少有关,与 G. kunthiana 的光合作用非气孔限制和氧化应激有关。所有物种的阳离子吸收都受到 NH4+ 的负面影响。Cariniana estrellensis 的光合作用没有受到限制,在 HL 条件下,其营养含量对 NH4+ 的耐受性更高。总之,在 LL 条件下,两种氮源都不明显有利于幼苗的生长,而在 HL 条件下,NH4+ 比 NO3- 更不利于幼苗的生长。
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来源期刊
Environmental and Experimental Botany
Environmental and Experimental Botany 环境科学-环境科学
CiteScore
9.30
自引率
5.30%
发文量
342
审稿时长
26 days
期刊介绍: Environmental and Experimental Botany (EEB) publishes research papers on the physical, chemical, biological, molecular mechanisms and processes involved in the responses of plants to their environment. In addition to research papers, the journal includes review articles. Submission is in agreement with the Editors-in-Chief. The Journal also publishes special issues which are built by invited guest editors and are related to the main themes of EEB. The areas covered by the Journal include: (1) Responses of plants to heavy metals and pollutants (2) Plant/water interactions (salinity, drought, flooding) (3) Responses of plants to radiations ranging from UV-B to infrared (4) Plant/atmosphere relations (ozone, CO2 , temperature) (5) Global change impacts on plant ecophysiology (6) Biotic interactions involving environmental factors.
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