Effects of high temperature on photosynthesis, chlorophyll fluorescence, chloroplast ultrastructure, and antioxidant activities in fingered citron

Effects of high temperature on photosynthesis, chlorophyll fluorescence, chloroplast... Effects of heat stress on the photosynthesis system and antioxidant activities in Fingered citron (Citrus medica var. sarcodactylis Swingle) were investigated. Two-year-old Fingered citron plants were exposed to different temperature (28, 35, 40, and 45°C) for 6 h; then the photosynthetic capacity, chlorophyll fluorescence, chloroplast ultrastructure, and antioxidant activities in the leaves were evaluated. Exposure to 40 and 45°C for 6 h resulted in a significant decrease in the photosynthetic rate (P n), carboxylation efficiency (CE), the maximal photochemical efficiency of photosystem II, and the light-saturated photosynthetic rate, which were related to the reduction of CO2 assimilation, inactivation of photosystem II and photosynthetic electron transport. Moreover, transmission electron microscopy showed chloroplast ultrastructural alterations, including their swelling, matrix zone expanding, and lamella structure loosening. Furthermore, heat stress, especially at 45°C, caused oxidative damage resulted from ROS accumulation in Fingered citron leaves accompanied by increases in activities of superoxide dismutase, peroxidase, and catalase. However, exposure to 35°C for 6 h or 40°C for 4 h had no significant influence on the photosynthetic capacity at all. The results suggest that Fingered citron plants show no heat injury when temperature is below 40°C. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Effects of high temperature on photosynthesis, chlorophyll fluorescence, chloroplast ultrastructure, and antioxidant activities in fingered citron

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Publisher
SP MAIK Nauka/Interperiodica
Copyright
Copyright © 2012 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Plant Physiology; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1134/S1021443712060040
Publisher site
See Article on Publisher Site

Abstract

Effects of heat stress on the photosynthesis system and antioxidant activities in Fingered citron (Citrus medica var. sarcodactylis Swingle) were investigated. Two-year-old Fingered citron plants were exposed to different temperature (28, 35, 40, and 45°C) for 6 h; then the photosynthetic capacity, chlorophyll fluorescence, chloroplast ultrastructure, and antioxidant activities in the leaves were evaluated. Exposure to 40 and 45°C for 6 h resulted in a significant decrease in the photosynthetic rate (P n), carboxylation efficiency (CE), the maximal photochemical efficiency of photosystem II, and the light-saturated photosynthetic rate, which were related to the reduction of CO2 assimilation, inactivation of photosystem II and photosynthetic electron transport. Moreover, transmission electron microscopy showed chloroplast ultrastructural alterations, including their swelling, matrix zone expanding, and lamella structure loosening. Furthermore, heat stress, especially at 45°C, caused oxidative damage resulted from ROS accumulation in Fingered citron leaves accompanied by increases in activities of superoxide dismutase, peroxidase, and catalase. However, exposure to 35°C for 6 h or 40°C for 4 h had no significant influence on the photosynthetic capacity at all. The results suggest that Fingered citron plants show no heat injury when temperature is below 40°C.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Oct 13, 2012

References

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