Comparison of Photosynthesis Characteristics in Five Provenances of Mirabilis himalaica
Objective: To provide the theoretical basis for provenance selection,by comparing the photosynthesis characteristics of Mirabilis himalaica in five provenances in Tibet Autonomous Region (a:Gongbujiangda Apeicun,b:Langxian Laduoxiang,c:Sangrixian Zengqixiang,d:Zhalangxian Minzhulinsi,e:Langxian Zenongxiang).Methods:The seeds of M.himalaica from in different provenanceswere cultivated,chlorophyll and photosynthetic rate(Pn),transportation rate(Tr),intercellular CO2 concentration (Ci) were measured after period of blooming by using LI-6400 portable photosynthesis system.Results:The Pn of a,b and c showed a single peak curve and indicated significant high photosynthetic efficiency characteristics,while the Pn of d and e showed a double peak curve and indicated low photosynthetic efficiency characteristics.The light compensation point of a was lower than others,while the light saturation point higher than others.It indicated the light energy utilization rate of a was strongest.CO2 saturation point of e was significantly lower than others,while CO2 compensation point was higher.It indicated its ability to take advantage of CO2 is weak.Conclusion:Photosynthetic physiological parameters of M.himalaica in different provenances have significant differences,and the photosynthetic capacity showed:a>b>c>d>e.
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维普
