title: [Effects of elevated atmospheric CO2 concentration on mung bean leaf photosynthesis and chlorophyll fluorescence parameters].
abstract: By using free air CO2 enrichment (FACE) system, a pot experiment under field condition was conducted to study the effects of elevated CO2 concentration (550 +/- 60 micromol mol(-1)) on the leaf photosynthesis and chlorophyll fluorescence parameters of mung bean. Comparing with the control (CO2 concentration averagely 389 +/- 40 micromol mol(-1)), elevated CO2 concentration increased the leaf intercellular CO2 concentration (Ci) and net photosynthesis rate (P(n)) at flowering and pod growth stage by 9.8% and 11.7%, decreased the stomatic conductance (G(s)) and transpiration rate (T(r)) by 32.0% and 24.6%, respectively, and increased the water use efficiency (WUE) by 83.5%. Elevated CO2 concentration had lesser effects on the minimal fluorescence (F0), maximal fluorescence (F(m)), variable fluorescence (F(v)), ratio of variable fluorescence to minimal fluorescence (F(v)/F0), and ratio of variable fluorescence to maximal fluorescence (F(v)/F(m)) at bud stage, but increased the F0 at pod filling stage by 19.1% and decreased the Fm, F(v), F(v)/F0, and F(v)/F(m) by 9.0%, 14.3%, 25.8% , and 6.2%, respectively. These results suggested that elevated CO2 concentration could damage the structure of leaf photosystem II and consequently decrease the leaf photosynthetic capacity in the late growth phase of mung bean.
authors.affiliation: College of Agriculture, Shanxi Agricultural University, Taigu 030801, Shanxi, China. haoxingyu1976@126.com
authors.forename: Xing-yu
authors.initials: XY
authors.lastname: Hao
authors.forename: Xue
authors.initials: X
authors.lastname: Han
authors.forename: Ping
authors.initials: P
authors.lastname: Li
authors.forename: Hong-bin
authors.initials: HB
authors.lastname: Yang
authors.forename: Er-da
authors.initials: ED
authors.lastname: Lin
mesh_terms: D001272:Atmosphere / Q000032:analysis*; D002245:Carbon Dioxide / Q000032:analysis*; D002734:Chlorophyll / Q000378:metabolism*; D007887:Fabaceae / Q000502:physiology*; D005453:Fluorescence; D010788:Photosynthesis / Q000502:physiology*; D045332:Photosystem II Protein Complex / Q000187:drug effects; D018515:Plant Leaves / Q000502:physiology
chemical_list: D045332:Photosystem II Protein Complex; D002734:Chlorophyll; D002245:Carbon Dioxide