کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8357403 | 1542048 | 2015 | 30 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
CO2 enrichment modulates ammonium nutrition in tomato adjusting carbon and nitrogen metabolism to stomatal conductance
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کلمات کلیدی
NADP-dependent isocitrate dehydrogenaseICDHGS2OxaloacetateOAANADP-MEPEPCMDHSolanum lycopersicum L.GS1GDHNADP-dependent malic enzymeTCANAD-MEcytosolic glutamine synthetaseWUEElevated CO2 - افزایش CO2Water use efficiency - بهره وری استفاده از آبAmmonium tolerance - تحمل آمونیمNitrate nutrition - تغذیه نیتراتNitrogen assimilation - جذب نیتروژنintercellular CO2 concentration - غلظت CO2 بین سلولیmalate dehydrogenase - ملات دهیدروژنازTCA cycle - چرخه TCAtricarboxylic acid cycle - چرخه اسید تریکاربوکیلیکglutamate dehydrogenase - گلوتامات دهیدروژناز
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Ammonium (NH4+) toxicity typically occurs in plants exposed to high environmental NH4+ concentration. NH4+ assimilating capacity may act as a biochemical mechanism avoiding its toxic accumulation but requires a fine tuning between nitrogen assimilating enzymes and carbon anaplerotic routes. In this work, we hypothesized that extra C supply, exposing tomato plants cv. Agora Hybrid F1 to elevated atmospheric CO2, could improve photosynthetic process and thus ameliorate NH4+ assimilation and tolerance. Plants were grown under nitrate (NO3â) or NH4+ as N source (5-15Â mM), under two atmospheric CO2 levels, 400 and 800Â ppm. Growth and gas exchange parameters, 15N isotopic signature, C and N metabolites and enzymatic activities were determined. Plants under 7.5Â mM N equally grew independently of the N source, while higher ammonium supply resulted toxic for growth. However, specific stomatal closure occurred in 7.5Â mM NH4+-fed plants under elevated CO2 improving water use efficiency (WUE) but compromising plant N status. Elevated CO2 annulled the induction of TCA anaplerotic enzymes observed at non-toxic NH4+ nutrition under ambient CO2. Finally, CO2 enrichment benefited tomato growth under both nutritions, and although it did not alleviate tomato NH4+ tolerance it did differentially regulate plant metabolism in N-source and -dose dependent manner.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Plant Science - Volume 241, December 2015, Pages 32-44
Journal: Plant Science - Volume 241, December 2015, Pages 32-44
نویسندگان
Izargi Vega-Mas, Daniel Marino, Joseba Sánchez-Zabala, Carmen González-Murua, Jose MarÃa Estavillo, MarÃa Begoña González-Moro,