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The  Arabidopsis  non-specific phospholipase C  1   (NPC) protein family is encoded by the genes  NPC1 – NPC6 . It has been shown that NPC4 and NPC5 possess phospholipase C activity; NPC3 has lysophosphatidic acid phosphatase activity. NPC3, 4 and 5 play roles in the responses to hormones and abiotic stresses. NPC1, 2 and 6 has not been studied functionally yet. We found that  Arabidopsis  NPC1 expressed in  Escherichia coli  possesses phospholipase C activity  in vitro . This protein was able to hydrolyse phosphatidylcholine to diacylglycerol. NPC1-green fluorescent protein was localized to secretory pathway compartments in  Arabidopsis  roots. In the knock out T-DNA insertion line NPC1 ( npc1 ) basal thermotolerance was impaired compared with wild-type (WT);  npc1  exhibited significant decreases in survival rate and chlorophyll content at the seventh day after heat stress (HS). Conversely, plants overexpressing NPC1 (NPC1-OE) were more resistant to HS compared with WT. These findings suggest that NPC1 is involved in the plant response to heat.

Arabidopsis non-specific phospholipase C1: characterization and its involvement in response to heat stress