التفاصيل البيبلوغرافية
| العنوان: |
CO2 elevation and nutrient patchiness interactively affect morphology, nitrogen uptake, partitioning and use efficiency of Nicotiana tabacum L. (tobacco) during anthesis. |
| المؤلفون: |
Zhang, Lin, Li, Guitong, Li, Caibin, Liu, Fulai |
| المصدر: |
Journal of Agronomy & Crop Science; Aug2022, Vol. 208 Issue 4, p523-535, 13p |
| مصطلحات موضوعية: |
PLANT exudates, TOBACCO growing, TOBACCO, TOBACCO use, PLANT growth, CARBON dioxide, NICOTIANA |
| مستخلص: |
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. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
