Elevated chloroplastic glutathione reductase activities decrease chilling-induced photoinhibition by increasing rates of photochemistry, but not thermal energy dissipation, in transgenic cotton

Functional Plant Biology : FPB
Dmytro KornyeyevA Scott Holaday

Abstract

The effect of the overproduction of glutathione reductase (GR+) in cotton (Gossypium hirsutum L. cv.Coker 312) chloroplasts on the response of photosynthetic parameters to chilling in the light was examined. After 180 min at 10°C and 500 μmol photons m-2 s-1 in the chamber of an oxygen electrode, leaf discs of GR+ plants exhibited lower levels of sustained PSII photoinhibition than leaf discs of wild-type plants. No genotypic differences in thermal energy dissipation, leaf pigment composition, or the dynamics of xanthophyll cycle de-epoxidation were observed. The rate of induction and steady-state levels of photochemistry were greater for GR+ in comparison to wild-type plants. Enhanced photochemistry in GR+ plants could not be attributed to higher rates of CO2 assimilation at 10°C. Although GR overproduction afforded some increased protection against PSI photoinactivation, suggesting improved scavenging of reactive oxygen species, higher PSI activities could not completely explain the greater rates of photochemistry. Pools of glutathione and ascorbate were significantly more reduced in GR+ plants. Increased demand for reducing power to maintain these constituents in the reduced state may contribute to the higher rates of photoc...Continue Reading

Citations

Nov 30, 2012·Critical Reviews in Biotechnology·Vajhala S K ChakravarthyKhareedu Venkateswara Rao
Jun 3, 2015·Journal of Integrative Plant Biology·Shunhua DingCongming Lu
Aug 1, 2004·Functional Plant Biology : FPB·Eduardo Pérez-TorresLeónA Bravo
Apr 20, 2006·Photosynthesis Research·Barry A LoganA Scott Holaday
Jun 25, 2008·Physiologia Plantarum·Benjamin P DeRidder, Steven J Crafts-Brandner
May 5, 2020·The Plant Journal : for Cell and Molecular Biology·Stefanie J Müller-SchüsseleAndreas J Meyer
Jul 4, 2020·Plant Signaling & Behavior·Jing YuXiutian Wang
Dec 7, 2010·Physiologia Plantarum·Kintake Sonoike
Feb 19, 2021·Frontiers in Plant Science·Petr DvořákTomáš Takáč
Sep 28, 2010·Plant Physiology and Biochemistry : PPB·Sarvajeet Singh Gill, Narendra Tuteja

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