PHOTOPERIODIC AGING IN ANAGALLIS ARVENSIS CLONES: ITS RELATION TO RNA CONTENT,ROOTING CAPACITY,AND FLOWERING |
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| Authors: | Victorio S Trippi Jeanne Brulfert |
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| Institution: | Laboratorio de Fisiología Vegetal, Facultad de Ciencias Exastas, Físicas, y Naturales, Universidad Nacional de Cordoba, Córdoba, República Argentina and Laboratoire du Phytotron, 91, Gif-sur-Yvette, France |
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| Abstract: | We investigated the photoperiodic regulation of aging in Anagallis arvensis L. propagated by cuttings. Short-day (SD) conditions caused the persistence of juvenile forms and vegetative growth, as well as high rooting capacity and a high RNA content, through successive vegetative multiplications. SD + 1 long day (LD) every 15th day induced reproductive growth but allowed the persistence of a high rooting capacity and high RNA content through vegetative multiplications. LD conditions caused the persistence of the reproductive stage, the progressive loss of rooting capacity, and a decrease of RNA content. The longevity of the clones seems to be connected to the photoperiodic effects which induce indeterminate growth (SD) and/or determinate and reproductive growth. The loss of propagation capacity and the decrease of RNA content can be considered as indexes of aging not only in plants but also in clones. |
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