title: [Analysis of photosynthetic characteristics and its influencing factors of medicinal plant Mirabilis himalaica].
abstract: To study photosynthetic characteristics and its influencing factors in leaves of medicinal plant Mirabilis himalaica, and provide an evidence for guiding artificial planting and improving the quantity. The light-response and diurnal photosynthesis course of leaves at the booting stages of 1-3 year old M. himalaica were measured with LI-6400 system. The Results showed that the light response curves were fitted well by non rectangle hyperbola equation (R2 > or = 0.98). The values of the maximum photosynthetic rate (Pmax) and light use efficiency of three-year old M. himalaica leaves were higher than those of 1-2 year old individuals. The diurnal variation of net photosynthetic rate (Pn) and stomatal conductance (Gs) of 2-3 year old M. himalaica were typical double-peak curves determinately regulated by stomatal conductance. However, transpiration rate (Tr) of 1-3 year old plants leaves were single-peak curve, which was self-protection of harm reduction caused by the higher temperature at noontime. Correlation analysis showed that the changes between photosynthetic active radiation (PFD), air temperature (T ) and Pn, were significant positive related. Therefore, M. himalaica is a typical sun plant, which should be planted under the sufficient sunshine field and prolong the growing ages suitably in order to improve the yield.
authors.forename: Qi-Qiang
authors.initials: QQ
authors.lastname: Guo
authors.forename: Hong
authors.initials: H
authors.lastname: Quan
authors.forename: Xiao-Zhong
authors.initials: XZ
authors.lastname: Lan
authors.forename: Lian-Qiang
authors.initials: LQ
authors.lastname: Li
authors.forename: Hui-E
authors.initials: HE
authors.lastname: Li
mesh_terms: D001947:Breeding; D039282:Mirabilis / Q000254:growth & development / Q000378:metabolism*; D008954:Models, Biological; D010788:Photosynthesis; D013696:Temperature; D013997:Time Factors