Corn enzyme stays switched on to fight off drought
Fang T, Han Y, Chen Y, Hu X, Zhong Z
Plant Signaling
The corn in your garden or the fields you drive past could one day handle dry spells better, thanks to a built-in molecular switch scientists just mapped out in detail.
Plants have tiny pores on their leaves called stomata that open to breathe and close to save water. Researchers discovered that a particular enzyme in corn, called ZmCPK1, works nonstop as a kind of internal alarm system, tagging other proteins with phosphate markers to tell the plant when to shut those pores during drought. Unlike similar enzymes that need a calcium signal to activate, this one is always ready, and when drought hits, a brake normally holding it in check gets released so the whole system can snap into action.
Key Findings
ZmCPK1 is a calcium-independent kinase that remains constitutively active, unlike typical CDPKs that require calcium signaling to function.
ZmCPK1 phosphorylates three ABA pathway components (ZmSLAC1 at serine 54, ZmSnRK2.10, and ZmPP2C11 at serine 277), with ZmPP2C11 normally reversing this by dephosphorylating ZmSLAC1.
Drought and ABA treatment enhance ZmCPK1-driven phosphorylation by inhibiting ZmPP2C11 (via ABA-bound PYL proteins), triggering stomatal closure and improved drought resistance in maize.
chevron_right Technical Summary
Scientists found a special enzyme in corn that helps the plant sense drought and close its leaf pores to conserve water, acting like an always-on switch rather than needing a calcium signal to turn on. This discovery could help breeders develop more drought-tolerant corn varieties for a hotter, drier future.
Abstract Preview
Original paper
A calcium-independent CDPK positively regulates drought resistance in maize by modulating the ABA signaling pathway.
Calcium-dependent protein kinases (CDPKs/CPKs) play crucial roles in plant responses to drought stress. In this study, we reveal that ZmCPK1, an atypical CDPK whose kinase activity is calcium-indep...
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