ISHS Acta Horticulturae 424: II International Rose Symposium
LIMITATION OF ROSE PHOTOSYNTHETIC CAPACITY UNDER N DEPRIVATION |
| Authors: | C. Bellert, J.J. Longuenesse, P. Robin |
| DOI: | 10.17660/ActaHortic.1996.424.10 |
| Abstract:
Net photosynthesis rate was measured on "Sonia" rose (Rosa hybrida L.) plants grown under 2 regimes of N supply during the period of blooming. Measurements were made either at the whole plant level in controlled conditions (assimilation chamber) or at the leaf level "in situ" conditions (greenhouse). The rose plants either received 3.8 mM NO3- or were completely deprived of nitrogen. An asymptotic exponential equation was found to adequately represent the responses of net photosynthesis to increasing P.A.R.. Considering the +N plants as the control, maximum net photosynthesis rate of -N plants had a 25% decrease after 9 days of treatment. The relationships between leaf nitrogen content and Pmax will be specially discussed. | |
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