Effect of Temperature Stress on Antioxidant Defenses in Brassica oleracea

ACS Omega
Pilar SoengasMaría E Cartea

Abstract

Brassica oleracea crops are exposed to seasonal changes in temperature because of their biennial life cycle. Extreme temperatures (cold and heat) affect the photosynthetic activity and the yield of cabbage (B. oleracea capitata group) and kale (B. oleracea acephala group). We studied the relationship among antioxidant defenses, photosynthesis, and yield under extreme temperatures in both crops. Under these conditions, the plants increase the antioxidant defenses, responding to an increment in reactive oxygen species (ROS). The accumulation of ROS in chloroplasts decreases the chlorophyll content and provokes photoinhibition that leads to a low fixation of CO2 and loss of dry weight. Low temperatures especially increase the antioxidant defenses and decrease the chlorophyll content compared to the heat conditions. However, dry weight losses are higher when plants are grown under heat than under cold conditions, probably because of the inactivation of Rubisco and/or the associated enzymes. Both crops were more resilient to cold than to heat temperatures, the capitata group being more resistant.

References

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Sep 18, 2002·Trends in Plant Science·Ron Mittler
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Jan 5, 2011·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·María Elena CarteaPablo Velasco
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Sep 10, 2014·PloS One·Tamara SoteloPilar Soengas
Jun 17, 2015·BMC Plant Biology·Víctor M RodríguezPablo Velasco

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Citations

Nov 16, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Andrzej KaliszEdward Kunicki
Nov 22, 2020·International Journal of Molecular Sciences·Mirza HasanuzzamanMasayuki Fujita
Jul 10, 2019·Current Opinion in Plant Biology·Jessica C Fernandez, Tessa M Burch-Smith

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Methods Mentioned

BETA
environmental stress

Software Mentioned

SAS

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