(1799 - 1891)
Eminente naturalista, publicó el Compendio de Geografía de la Isla de Cuba, primer libro de su tipo escrito e impreso en el país. Pero su obra monumental es Ictiología Cubana, fruto de sus investigaciones de más de cincuenta años.
Agrarian and Fishery Sciences
2005 | Photosynthetic activity and antioxidant sytems of Lycopersicon esculentum Mill., in high temperature stress conditions
Main executives entity: National Institute of Agricultural Science (INCA) (1)
Other entities: Center for Applied Edaphology and Biology Segura (2)
Main author: Daymi Mercedes Camejo López (1) .
Coauthors: Walfredo Torres de la Noval (1), Juan José Alarcón Cabañero (2) and Francisca Sevilla Valenzuela (2) .

The increase of environmental temperature is one of the most important limiting factors for tropical agriculture.

In this work, it was studied for the first time in Cuba, the effect of stress caused by high temperature in the photosynthetic activity and antioxidant sytems of different tomato plants (Lycopersicon esculentum Mill.), including a cultivation obtained in the country and a common genotype, through current and new techniques.

It was determined that tolerance or acclimatization of the mesophyllic component defines the tolerance to photosynthesis heat in the genotypes that were studied, controlled by the maximum carboxylation speed of Rubisco enzyme and the electronic transport. The enzymatic antioxidant systems studied are not related to the tolerance of the photosynthetic apparatus, except Fe-SOD isoenzyme, which seems to have a protective role in chloroplasts. It is suggested a biological model to study the mechanisms of tolerance to high temperatures based on the photosynthetic apparatus.

The results of this work constitute useful biological knowledge that allowed recommending tolerance indicators to high temperatures in tomato in our conditions, as well as their study as genetic components for the selection of new tolerant genotypes. It was characterized the behaviour of a genotype group in extreme stress conditions using physiological indicators.

New techniques were used (chlorophyll fluorescence) in order to establish at which level of the electron transporter chain it was establish the tolerance or susceptibility to heat, and it was used Farquhar biochemical model to study photosynthetic apparatus’ behaviour, techniques applied to tomato cultivation for the first time in Cuba, which were tuned up to be used in similar studies in this subject.

The scientific level of these results allowed publishing them in several international prestigious magazines (Acta Physiologiae Plantarum, Journal of Plant Physiology and Functional Plant Biology), as well as in national magazines, and these have been presented in national and international scientific congresses. From part of this work, it was derived a Doctorate Thesis in Biological Sciencies, satisfactorily defended before the Permanent Examining Board in May, 2005. There are enclosed references from 7 scientific institutions, 4 of which are foreign institutions (from Chile, España and México).