title: [Photosynthetic characteristics of an invasive plant Conyza canadensis and its associated plants].
abstract: To explore the invasion mechanisms of Conyza canadensis and develop effective control measures, this paper studied the photosynthetic characteristics of the invasive plant and its main associated plants Ixeris chinensis and Commelina communis. The light saturation point and light compensation point of C. canadensis were 1634.00 and 23.84 micromol x m(-2) x s(-1), respectively, which were between those of the two associated plants. The maximum net photosynthetic rate of C. canadensis below light saturation point was 28.12 micromol x m(-2) x s(-1), being much higher than that of the two associated plants. The apparent quantum yield of C. canadensis was 0.06, equal to that of I. chinensis but higher than that of C. communis. The CO2 saturation point and CO2 compensation point of C. canadensis were 834.00 and 23.69 micromol x mol(-1), respectively. The maximum net photosynthetic rate of C. canadensis below CO2 saturation point was 31.97 micromol x m(-2) x s(-1), which was between that of the two associated species. The carboxylation efficiency of C. canadensis was 0.078, being higher than that of the two associated species. The variations of photosynthetically active radiation and CO2 concentration had little effects on the stomatal conductance and transpiration rate of the three plants, but significantly affected their water use efficiency. C. canadensis had higher photosynthetic rate and material accumulation capability, and its high productivity could be one of the important factors for its successful invasion.
authors.affiliation: College of Plant Protection, Shenyang Agricultural University, Shenyang 110161, China. wxh00050410@163.com
authors.forename: Xiao-Hong
authors.initials: XH
authors.lastname: Wang
authors.forename: Ming-Shan
authors.initials: MS
authors.lastname: Ji
mesh_terms: D019659:Asteraceae / Q000502:physiology*; D002681:China; D034822:Commelina / Q000502:physiology; D035401:Conyza / Q000502:physiology*; D017753:Ecosystem; D058865:Introduced Species; D010788:Photosynthesis / Q000502:physiology*