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Continuous light increases growth, daily carbon gain, antioxidants, and alters carbohydrate metabolism in a cultivated and a wild tomato species.

Haque MS, Kjaer KH, Rosenqvist E, Ottosen CO - Front Plant Sci (2015)

Bottom Line: The results demonstrated that CL conditions mainly affected the photosynthetic apparatus of a cultivated species (S. lycopersicum), and to a less degree to the wild species (S. pimpinellifolium).The negative effects of the CL could be alleviated by diurnal temperature variations, but the physiological mechanisms behind these are less clear.The results also show that the genetic potential for reducing the negative effects of CL does exist in the tomato germplasm.

View Article: PubMed Central - PubMed

Affiliation: Department of Food Science, Aarhus University Aarslev, Denmark.

ABSTRACT
Cultivated tomato species develop leaf injury while grown in continuous light (CL). Growth, photosynthesis, carbohydrate metabolism and antioxidative enzyme activities of a cultivated (Solanum lycopersicum L. 'Aromata') and a wild tomato species (Solanum pimpinellifolium L.) were compared in this study aiming to analyze the species-specific differences and thermoperiod effects in responses to CL. The species were subjected to three photoperiodic treatments for 12 days in climate chambers: 16-h photoperiod with a light/dark temperature of 26/16°C (P16D10 or control); CL with a constant temperature of 23°C (P24D0); CL with a variable temperature of 26/16°C (P24D10). The results showed that both species grown in CL had higher dry matter production due to the continuous photosynthesis and a subsequent increase in carbon gain. In S. lycopersicum, the rate of photosynthesis and the maximum photochemical efficiency of photosystem II declined in CL with the development of leaf chlorosis, reduction in the leaf chlorophyll content and a higher activity of antioxidative enzymes. The normal diurnal patterns of starch and sugar were only present under control conditions. The results demonstrated that CL conditions mainly affected the photosynthetic apparatus of a cultivated species (S. lycopersicum), and to a less degree to the wild species (S. pimpinellifolium). The negative effects of the CL could be alleviated by diurnal temperature variations, but the physiological mechanisms behind these are less clear. The results also show that the genetic potential for reducing the negative effects of CL does exist in the tomato germplasm.

No MeSH data available.


Related in: MedlinePlus

Leaflets of Solanum lycopersicum and S. pimpinellifolium grown in control (P16D10), continuous light with constant temperature (P24D0) and continuous light with variable temperature (P24D10) conditions. The photographs were taken after 12 days of start of CL exposure.
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Figure 1: Leaflets of Solanum lycopersicum and S. pimpinellifolium grown in control (P16D10), continuous light with constant temperature (P24D0) and continuous light with variable temperature (P24D10) conditions. The photographs were taken after 12 days of start of CL exposure.

Mentions: The development of chlorotic areas on the leaves became visible in S. lycopersicum after 8 days of CL, but only in the treatment with constant temperature (P24D0; Figure 1). No symptoms of leaf chlorosis were seen in S. pimpinellifolium in any of the three treatments. The development of the chlorotic areas in S. lycopersicum started from the base of the leaflets on leaf four and expanded toward the apex (Figure 1). Chlorotic areas were also seen on the top leaves above leaf four.


Continuous light increases growth, daily carbon gain, antioxidants, and alters carbohydrate metabolism in a cultivated and a wild tomato species.

Haque MS, Kjaer KH, Rosenqvist E, Ottosen CO - Front Plant Sci (2015)

Leaflets of Solanum lycopersicum and S. pimpinellifolium grown in control (P16D10), continuous light with constant temperature (P24D0) and continuous light with variable temperature (P24D10) conditions. The photographs were taken after 12 days of start of CL exposure.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4499675&req=5

Figure 1: Leaflets of Solanum lycopersicum and S. pimpinellifolium grown in control (P16D10), continuous light with constant temperature (P24D0) and continuous light with variable temperature (P24D10) conditions. The photographs were taken after 12 days of start of CL exposure.
Mentions: The development of chlorotic areas on the leaves became visible in S. lycopersicum after 8 days of CL, but only in the treatment with constant temperature (P24D0; Figure 1). No symptoms of leaf chlorosis were seen in S. pimpinellifolium in any of the three treatments. The development of the chlorotic areas in S. lycopersicum started from the base of the leaflets on leaf four and expanded toward the apex (Figure 1). Chlorotic areas were also seen on the top leaves above leaf four.

Bottom Line: The results demonstrated that CL conditions mainly affected the photosynthetic apparatus of a cultivated species (S. lycopersicum), and to a less degree to the wild species (S. pimpinellifolium).The negative effects of the CL could be alleviated by diurnal temperature variations, but the physiological mechanisms behind these are less clear.The results also show that the genetic potential for reducing the negative effects of CL does exist in the tomato germplasm.

View Article: PubMed Central - PubMed

Affiliation: Department of Food Science, Aarhus University Aarslev, Denmark.

ABSTRACT
Cultivated tomato species develop leaf injury while grown in continuous light (CL). Growth, photosynthesis, carbohydrate metabolism and antioxidative enzyme activities of a cultivated (Solanum lycopersicum L. 'Aromata') and a wild tomato species (Solanum pimpinellifolium L.) were compared in this study aiming to analyze the species-specific differences and thermoperiod effects in responses to CL. The species were subjected to three photoperiodic treatments for 12 days in climate chambers: 16-h photoperiod with a light/dark temperature of 26/16°C (P16D10 or control); CL with a constant temperature of 23°C (P24D0); CL with a variable temperature of 26/16°C (P24D10). The results showed that both species grown in CL had higher dry matter production due to the continuous photosynthesis and a subsequent increase in carbon gain. In S. lycopersicum, the rate of photosynthesis and the maximum photochemical efficiency of photosystem II declined in CL with the development of leaf chlorosis, reduction in the leaf chlorophyll content and a higher activity of antioxidative enzymes. The normal diurnal patterns of starch and sugar were only present under control conditions. The results demonstrated that CL conditions mainly affected the photosynthetic apparatus of a cultivated species (S. lycopersicum), and to a less degree to the wild species (S. pimpinellifolium). The negative effects of the CL could be alleviated by diurnal temperature variations, but the physiological mechanisms behind these are less clear. The results also show that the genetic potential for reducing the negative effects of CL does exist in the tomato germplasm.

No MeSH data available.


Related in: MedlinePlus