How guard cell chloroplasts obtain energy

Whether Guard Cells (GCs) carry out photosynthesis has been debated for decades. Earlier studies suggested that guard cell chloroplasts (GCCs) cannot fix CO2 but later studies argued otherwise. Until recently, it has remained controversial whether GCCs and/or GC photosynthesis play a direct role in stomatal movements. Researchers have now discovered GCs’ genuine source of fuel and untangled the mystery.

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