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Succulence and CAM relationships in Aeonium genus

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Abstract

The CAM has been tested in six species of the Aeonium genus by studying the diurnal fluctuation of organic acids, pH and night fixation of CO2. The existence of a mesophyll structure able to support this metabolism has been shown as well as a congruent periodicity in the pool of cell starch.

We have calculated the S, ES and Sm indices in the six species. A series of regression equations of different grades and types were calculated and shown to have correlation coefficients statistically significant. This allows us to confirm the suitability of the Sm index as a rapid test to establish the CAM as postulated by former authors.

Resumen

Se ha comprobado el CAM en seis especies del género Aeonium, mediante el estudio de las fluctuaciones diurnas del acervo de ácidos orgánicos, de las oscilaciones periódicas de pH y de la captura nocturna de CO2, al mismo tiempo que se ha verificado en ellas le existencia de una estructura del mesófilo capaz de soportar este metabolismo y una periodicidad congruente en el acervo de almidón celular.

Se han calculado asimismo los índices S, ES y Sm de especímenes de las seis especies y se ha podido establecer una serie de ecuaciones de regresión de distinto tipo y grado, a unos niveles de significación, que permiten postular, en el citado material, la idoneidad del índice Sm como prueba rápida del metabolismo ácido de las crasuláceas, confirmando de este modo las teorías de los primeros autores.

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Jimenez, M.S., Morales, D., Irarte, J. et al. Succulence and CAM relationships in Aeonium genus. Photosynth Res 4, 9–20 (1983). https://doi.org/10.1007/BF00041797

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  • DOI: https://doi.org/10.1007/BF00041797

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