Comparative Study on Photosynthetic Characteristics of Five Introduced Varieties of Acer rubrum
Han Yi
Han Biao
Lu Yizeng
Liu Deshen
Li Wenqing
Han Qingjun
Li Ningning
Xie Xiaoman
Abstract：The diurnal changes of photosynthesis,light response curves and CO2 response curves of five Acer rubrum varieties were compared and analyzed.The results showed that the diurnal changes of the net pho-tosynthetic rate (Pn)of Brandy and Acer ×freemanii Marmo displayed not typical double -peak curve,and their transpiration rate and photosynthetic efficiency were higher indicating their higher photosynthetic efficien-cy under strong light.The diurnal changes of Pn of Armstrong,Red Sunset and Somerset displayed typical double -peak curve,so they had obvious midday depression.The diurnal changes of Pn of Acer rubrum was influenced by water deficit significantly,so the daily management should pay more attention to irrigation time-ly.The analysis of light response curve and CO2 response curve showed that both the light saturation point (1 066.80 and 1 037.41 μmol·m -2 ·s -1 )and the saturation intercellular CO2 concentration (1 209.21 and 1 116.78 μmol·mol -1 )of Brandy and Acer ×freemanii Marmo were higher than those of the other three varieties,which showed better adaptability to bright light.The rate of photorespiration (6.1507 and 6.7199μmol·m -2 ·s -1 )of Armstrong and Red Sunset were better than that of the other three varieties,which is a protective mechanism for them adapt to bright light.Among the five Acer rubrum,Acer ×freemanii Marmo and Brandywine had better adaptability to bright light and grew faster;Armstrong,Red Sunset and Somerset nee-ded shade protection to promote their growth.
Keywords：Acer rubrumPhotosynthetic characteristicsLight responseCO2 responseDiurnal change of Pn
Publication Date：2016-11-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：6( 48-53 )