Altering young tomato plant growth by nitrate and CO₂preserves the proportionate relation linking long‐term organic‐nitrogen accumulation to intercepted radiation

Abstract

Summary• A previously published model of crop nitrogen (N) status based on intercepted photosynthetically active radiation (R i , mol per plant) suggested that plant organic N accumulation is related to R i by a constant ratio, defined hereafter as the radiation use efficiency for N (NRUE). The aim of this paper was to compare the effects of N nutrition and CO 2 enrichment on NRUE and RUE (radiation use efficiency for biomass accumulation).• • It is suggested that the radiation efficiency for organic N acquisition (NRUE) did not depend on C or N nutrition for young plants grown under unstressed conditions.

Nitrogen and water availability to tomato plants triggers bottom-up effects on the leafminer Tuta absoluta

“…We therefore calculated the daily amounts of nitrogen required to produce optimal dry mass during approximately 52 days of growth (ON treatment). To proceed, we used data of tomato growth previously obtained in our laboratory conditions47. We used 3 stock solutions to provide nitrate, phosphate and sulphate salts independently (+ Fe & micronutrients).…”

Autumnal N storage determines the spring growth, N uptake and N internal cycling of young peach trees

“…Thus, it delays leaf senescence (Rosecrance et al 1998;Niederholzer et al 2001) and increases carbon acquisition (Kubiske et al 1998;Veberic et al 2002). TNC availability has no impact on spring growth , but does affect the restoration of N uptake (Weinbaum et al 1978;Adamowicz and Le Bot 2008). The regulation of the TNC and of the N stores is therefore interdependent.…”

Interrelated responses of tomato plants and the leaf minerTuta absolutato nitrogen supply

“…() have reviewed the rationale for adjusting N supply to plant demand, thereby increasing N fertiliser use efficiency and lowering pollution. For tomato plants, N limitation or deficiency in the soil solution reduces growth and tissue N concentration (Adamowicz & Le Bot ), whereas it increases the concentrations of constitutive secondary compounds, which include phenolic acids and flavonoids (Fritz et al . ; Le Bot et al .…”

“…For horticultural crops and soilless cultural systems, Le Bot et al (1998) have reviewed the rationale for adjusting N supply to plant demand, thereby increasing N fertiliser use efficiency and lowering pollution. For tomato plants, N limitation or deficiency in the soil solution reduces growth and tissue N concentration (Adamowicz & Le Bot 2008), whereas it increases the concentrations of constitutive secondary compounds, which include phenolic acids and flavonoids (Fritz et al 2006;Le Bot et al 2009;Larbat et al 2012aLarbat et al ,b, 2014 and also glycoalkaloids (Royer et al 2013) in Solanaceae. The outcome of this trade-off between syntheses of primary and secondary compounds shifts the balance between growth and defensive plant functions (Herms & Mattson 1992;Le Bot et al 2009).…”