Chloroplast Signaling and LESION SIMULATING DISEASE1 Regulate Crosstalk between Light Acclimation and Immunity in Arabidopsis

We show that local and systemic acclimation in Arabidopsis thaliana leaves in response to excess excitation energy is associated with cell death and is regulated by specific redox changes of the plastoquinone pool

Per M├╝hlenbock

2008

Scholarcy highlights

  • When low light adapted plants are exposed to a sudden increase in light intensity, they experience a large increase in absorbed light energy
  • excitation energy-Induced Local and Systemic Programmed Cell Death Depends on Redox-Regulated Foliar Ethylene and Reactive oxygen species
  • (A) to TB staining of Col-0 leaves after low light, 1 h of excess light, fumigated with 7.5 ppb ethylene for 24 h in LL, fumigated with ethylene for 24 h and exposed to 1 h of EL, or exposed to 4 h of light-1; Col-0 leaves fumigated with ethylene for 24 h and exposed to L1; leaves exposed to light-2 or fumigated for 24 h with ethylene and exposed to 4 h of L2; leaves of the ethylene insensitive 2-1 null mutant exposed to 1 h of EL; and leaves of the ein2-1 null mutant exposed to 24 h of ethylene and to 1 h of EL
  • We identified the presence of several robust markers for light acclimation, pathogen defense, ozone, drought, low-temperature responses, and genes regulated by ethylene, ROS, glutathione, salicylic acid, abscisic acid, sugar, and auxin signaling (Figure 4, Table 1;
  • We provide several pieces of evidence that the production of ACC, ROS, and expression of genes regulated by ethylene, ROS, SA, glutathione, ABA, IAA, and sugars under excess light stress are regulated, at least in part, by signaling originating from redox changes in the photosynthetic transport carriers, for example, the PQ pool
  • Our results show that LESION SIMULATING DISEASE RESISTANCE1 suppresses an ethylene/ ROS-dependent programmed cell death pathway that requires the functions of ENHANCED DISEASE SUSCEPTIBILITY1 and PHYTOALEXIN DEFICIENT4

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