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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

Fructose (A,B), glucose (C,D), sucrose (E,F), and starch (G,H) contents in S. lycopersicum and S. pimpinellifolium leaves at different times of the day in P16D10, P24D0, and P24D10 growth conditions. The data were collected at the end of light (EL, 12:30; white shadow) and at the end of dark (ED, 20:30; gray shadow) of each day. Vertical bars are SEM (n = 4). Treatment means with different letters within each time of measurement are significantly different and the statistical analysis was done by the Tukey and Waller–Duncan k-ratio t-test.
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Figure 4: Fructose (A,B), glucose (C,D), sucrose (E,F), and starch (G,H) contents in S. lycopersicum and S. pimpinellifolium leaves at different times of the day in P16D10, P24D0, and P24D10 growth conditions. The data were collected at the end of light (EL, 12:30; white shadow) and at the end of dark (ED, 20:30; gray shadow) of each day. Vertical bars are SEM (n = 4). Treatment means with different letters within each time of measurement are significantly different and the statistical analysis was done by the Tukey and Waller–Duncan k-ratio t-test.

Mentions: The content of sugars and starch in leaves of S. lycopersicum was significantly affected by CL (Figure 4) showing an accumulation of large amount of glucose and fructose especially, when the temperature was low during the period corresponding to the dark period in the P16D10 treatment (Figures 4A,C). At the end of the light period of P16D10 on day 5, the leaf glucose and fructose content in S. lycopersicum were higher in the CL treatments compared to the P16D10 treatment, whereas fructose and glucose contents at the end of the light period on day 12 were not significantly different (Figures 4A,C). At the end of the dark period (the dark period of P16D10), the glucose and fructose contents increased in the S. lycopersicum plants in P24D10.


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)

Fructose (A,B), glucose (C,D), sucrose (E,F), and starch (G,H) contents in S. lycopersicum and S. pimpinellifolium leaves at different times of the day in P16D10, P24D0, and P24D10 growth conditions. The data were collected at the end of light (EL, 12:30; white shadow) and at the end of dark (ED, 20:30; gray shadow) of each day. Vertical bars are SEM (n = 4). Treatment means with different letters within each time of measurement are significantly different and the statistical analysis was done by the Tukey and Waller–Duncan k-ratio t-test.
© Copyright Policy
Related In: Results  -  Collection

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

Figure 4: Fructose (A,B), glucose (C,D), sucrose (E,F), and starch (G,H) contents in S. lycopersicum and S. pimpinellifolium leaves at different times of the day in P16D10, P24D0, and P24D10 growth conditions. The data were collected at the end of light (EL, 12:30; white shadow) and at the end of dark (ED, 20:30; gray shadow) of each day. Vertical bars are SEM (n = 4). Treatment means with different letters within each time of measurement are significantly different and the statistical analysis was done by the Tukey and Waller–Duncan k-ratio t-test.
Mentions: The content of sugars and starch in leaves of S. lycopersicum was significantly affected by CL (Figure 4) showing an accumulation of large amount of glucose and fructose especially, when the temperature was low during the period corresponding to the dark period in the P16D10 treatment (Figures 4A,C). At the end of the light period of P16D10 on day 5, the leaf glucose and fructose content in S. lycopersicum were higher in the CL treatments compared to the P16D10 treatment, whereas fructose and glucose contents at the end of the light period on day 12 were not significantly different (Figures 4A,C). At the end of the dark period (the dark period of P16D10), the glucose and fructose contents increased in the S. lycopersicum plants in P24D10.

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