title: Specific effects of irradiance and CO2 concentration doublings on productivity and mineral content in lettuce.
abstract: Experiments in growth chambers with controlled atmosphere were performed to compare the effects on the productivity of two treatments stimulating photosynthesis: the doubling of CO2 concentration, the doubling of irradiance; the combining of both was also tested. A large effect of light was noticed: (i) the accumulation of carbon was, contrarily to CO2 effect, amplified within time, and led to the most important dry matter production. (ii) the specific leaf weight was about two-fold increased. (iii) the nitrate content was 2-3 fold less. A significant positive effect of CO2 was detected on the fresh biomass production and the iron content of lettuce. A synergy was observed on dry matter production by the interaction of the two factors.
authors.affiliation: Commissariat a l'Energie Atomique, Departement de Physiologie Vegetale et Ecosystemes, Saint-Paul-lez-Durance, France.
authors.forename: P
authors.initials: P
authors.lastname: Chagvardieff
authors.forename: T
authors.initials: T
authors.lastname: d'Aletto
authors.forename: M
authors.initials: M
authors.lastname: Andre
mesh_terms: D018533:Biomass; D002245:Carbon Dioxide / Q000378:metabolism / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004307:Dose-Response Relationship, Radiation; D018504:Ecological Systems, Closed; D004780:Environment, Controlled; D018545:Lactuca / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism / Q000528:radiation effects; D008027:Light; D008903:Minerals / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism; D010788:Photosynthesis / Q000187:drug effects / Q000528:radiation effects
chemical_list: D008903:Minerals; D002245:Carbon Dioxide; D009584:Nitrogen