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Effect of Temperature Stress on Antioxidant Defenses in . | LitMetric

Effect of Temperature Stress on Antioxidant Defenses in .

ACS Omega

Group of Genetics, Breeding and Biochemistry of Brassicas, Misión Biológica de Galicia (MBG-CSIC), Apartado 28, 36080 Pontevedra, Spain.

Published: May 2018

AI Article Synopsis

  • * Under extreme conditions, these crops produce more antioxidants in response to increased reactive oxygen species (ROS), which negatively affects chlorophyll content and CO fixation.
  • * Cabbage and kale show greater resilience to cold temperatures than heat, with the capitata group (cabbage types) being particularly more resistant; however, dry weight losses are greater in heat conditions than in cold.

Article Abstract

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 ( group) and kale ( 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 CO 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.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6044755PMC
http://dx.doi.org/10.1021/acsomega.8b00242DOI Listing

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