H2AX is a meiosis-specific isoform of histone H2A. Upon DSB formation, rapid accumulation of phosphorylated H2AX (γ H2AX) occurs around the break site.
Glutamine synthetase catalyses the synthesis of glutamine from glutamate and ammonia, which is one of the key enzymes involved in nitrogen metabolism of plants. Two classes of glutamine synthetase are present in plants, cytosolic form (GLN1) and chloroplastic form (GLN2). While GLN1 is encoded by five genes (AT5G37600, AT1G66200, AT3G17820, AT5G16570, AT1G48470), GLN2 is encoded by a single gene (AT5G35630).
SIGE is a specialized sigma factor that functions in regulation of plastid genes and is responsible for the light-dependent transcription at the psbD LRP.