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CO2 elevation and nutrient patchiness interactively affect morphology, nitrogen uptake, partitioning and use efficiency of Nicotiana tabacum L. (tobacco) during anthesis
Journal of Agronomy and Crop Science ( IF 3.7 ) Pub Date : 2022-06-16 , DOI: 10.1111/jac.12610
Lin Zhang 1, 2, 3 , Guitong Li 2 , Caibin Li 4 , Fulai Liu 3
Affiliation  

The stimulation effect of elevated [CO2] (e[CO2]) on plant growth is modulated by nitrogen (N) availability, yet the mechanisms of this modulation under patchy N supply remain largely elusive. This study aimed to investigate the mechanisms by which patchy nutrient supply in the root-zone influence on N uptake, partitioning and use efficiency of tobacco plants (Nicotiana tabacum L.) grown under e[CO2]. A split-root pot experiment was conducted on tobacco plants grown at ambient (a[CO2], 400 μmol L−1) and e[CO2] (800 μmol L−1) conditions during anthesis. Plants were subjected to two fertilizer levels [0 and 113-29-214 (N-P-K) mg kg−1 soil] and three fertilization regimes (partial root-zone fertilization, PRN, couple root-zone fertilization, CRN and no fertilization, CK). Elevated [CO2] significantly decreased N concentrations in all tobacco organs, with the greatest reduction in leaves. Positive responses of tobacco biomass and NUE to e[CO2] were recorded, and a large amount of 15N labelled fertilizer-N was partitioned to stems at the expense to leaves. Compared to the partially fertilized root, an equal N concentration was observed in the non-fertilized root. In addition, compared with CRN, PRN increased the root exudates of sugar and organic acid; however, the increased root biomass by nutrient patchiness did not enhance plant total N uptake. Collectively, e[CO2] could sustain N assimilation and distribution of tobacco plants in response to natural heterogeneous nutrient available in the soil caused by patchy fertilization.

中文翻译:

CO2 升高和养分斑块性交互影响花期烟草的形态、氮吸收、分配和利用效率

升高的 [CO 2 ] ( e [CO 2 ]) 对植物生长的刺激作用受氮 (N) 有效性的调节,但在零散的 N 供应下这种调节的机制在很大程度上仍然难以捉摸。本研究旨在探讨根区不均匀的养分供应对e [CO 2 ]下生长的烟草植物( Nicotiana tabacum L.)的N 吸收、分配和利用效率的影响机制。对在环境 ( a [CO 2 ], 400 μmol L -1 ) 和e [CO 2 ] (800 μmol L -1) 在开花期的条件。植物经受两种肥料水平[0和113-29-214(NPK)mg kg -1土壤]和三种施肥方案(部分根区施肥,PRN,一对根区施肥,CRN和不施肥,CK) . 升高的 [CO 2 ] 显着降低了所有烟草器官中的 N 浓度,其中叶片的降低幅度最大。记录了烟草生物量和 NUE 对e [CO 2 ] 的正响应,大量15N 标记的肥料-N 被分配到茎中而牺牲了叶子。与部分受精根相比,在未受精根中观察到相同的氮浓度。此外,与CRN相比,PRN增加了糖和有机酸的根系分泌物;然而,营养斑块增加的根生物量并没有增加植物的总氮吸收。总的来说,e [CO 2 ] 可以维持烟草植物的 N 同化和分布,以响应由斑块施肥引起的土壤中可用的天然异质养分。
更新日期:2022-06-16
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