ACC synthase expression regulates leaf performance and drought tolerance in maize

Summary

This study investigated the role of ACC synthase (ACS) in regulating maize leaf function and drought responses by characterising ZmACS6 mutants. Loss of ZmACS6 expression delayed senescence under both normal and drought conditions whilst maintaining photosynthetic activity, and unexpectedly elevated chlorophyll, Rubisco, and soluble protein levels across all leaf ages. The findings suggest ethylene regulates leaf performance throughout development, not merely at senescence onset, and may represent a target for improving drought tolerance in cereals.

Regional applicability

The study was conducted using laboratory and controlled environment methods on maize, a major arable crop also cultivated in the United Kingdom. Findings on ethylene-mediated senescence and drought tolerance mechanisms are likely transferable to UK growing conditions, though field validation under UK rainfall patterns and temperatures would strengthen applicability for breeding or agronomic practice.

Key measures

Photosynthetic activity, leaf senescence onset timing, foliar chlorophyll concentration, Rubisco content, soluble protein levels, leaf performance metrics under normal and drought stress conditions

Outcomes reported

The study examined how loss of ZmACS6 expression (affecting ethylene biosynthesis) affects leaf senescence and drought tolerance in maize mutants. Key measurements included photosynthetic activity, leaf senescence timing, chlorophyll content, Rubisco levels, and soluble protein under normal and drought conditions.

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