Analysis of photosynthetic characteristics and its influencing factors of medicinal plant Mirabilis himalaica.
- Author:
Qi-Qiang GUO
;
Hong QUAN
;
Xiao-Zhong LAN
;
Lian-Qiang LI
;
Hui-E LI
- Publication Type:Journal Article
- MeSH:
Breeding;
Mirabilis;
growth & development;
metabolism;
Models, Biological;
Photosynthesis;
Temperature;
Time Factors
- From:
China Journal of Chinese Materia Medica
2014;39(14):2769-2773
- CountryChina
- Language:Chinese
-
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.
