A spontaneous mutation in a key C4 pathway gene significantly alters leaf δ13C, uncoupling its relationship with water use efficiency and photosynthetic performance in Zea mays.

Abstract excerpt

Increases in global temperature and drought are negatively impacting the yields of major crops. Therefore, targeted improvements to intrinsic water use efficiency (WUEi) are needed to reduce the water required for agricultural production. While it is very time-consuming to directly measure WUEi, stable carbon isotope ratios (δ13C) are a reliable high throughput proxy trait for quantifying WUEi in C3 species....

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