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Scientia Silvae Sinicae ›› 2007, Vol. 43 ›› Issue (02): 31-36.doi: 10.11707/j.1001-7488.20070206

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Comparison of Photosynthetic Characteristics between Wild Plants and Cultivars of Rosa rugosa

Feng Liguo1,Feng Zhen2,Zhao Lanyong2,Sheng Lixia1   

  1. 1.College of Horticulture Science and Engineering, Shandong Agricultural University Tai'an 271018; 2.College of Forestry, Shandong Agricultural University Tai'an 271018
  • Received:2005-12-13 Revised:1900-01-01 Online:2007-02-25 Published:2007-02-25

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Abstract:

Photosynthetic characteristics of two wild roses (Rosa rugosa, from Hunchun, Jilin Province and Muping, Shandong Province) and two rose cultivars (R. rugosa ‘Purple Branch' from Pingyin, Shandong Province and R. sertata×R. rugosa from Kushui, Gansu Province) were studied comparatively with CIRAS-2 portable photosynthetic instrument and FMS-2 fluorometer. The results showed that the curve of the diurnal change in the net photosynthetic rate (Pn) of ‘Hunchun' wild rose showed only one peak, but that of ‘Muping' wild rose and R. rugosa ‘Purple Branch' were all inapparent bimodal curves, and for R. sertata× R. rugosa, it was a typical bimodal curve. The maximal Pn values of the wild roses were significantly higher than those of the two cultivars, especially from 6:30 to 14:30, and the wild roses showed the characteristic of high photosynthetic efficiency. ‘Midday depression' phenomenon of photosynthesis occurred in ‘Hunchun' wild rose, R. rugosa ‘Purple Branch' and R. sertata×R. rugosa, nor ‘Muping' wild rose. The depression of Pn in R. rugosa ‘Purple Branch' was mainly induced by non-stomatal factors, but for ‘Hunchun' wild rose, ‘Muping' wild rose and R. sertata×R. rugosa, it was jointly affected by stomatal factors and non-stomatal factors. The diurnal changes of the chlorophyll fluorescent parameters showed that photoinhibition occurred in all roses, but the wild roses were more sensible to strong light and showed a more serious photoinhibition than the rose cultivars at noon; they could use the light to carrying out photosynthesis more efficiently than the rose cultivars in the morning, but the rose cultivars could use the light more efficiently than the wild roses in the afternoon. The reversible inactivations of PSⅡ reaction centers and the course of dissipating excess energy efficiently through non_photochemical quenching (NPQ) were the main mechanism of protecting PSⅡ reaction centers of rose leaves from damaging by strong light.

Key words: wild rose, rose cultivar, photosynthesis, chlorophyll fluorescence