Deep rooting conferred by DEEPER ROOTING 1 enhances rice yield in paddy fields.

Area of Science:

• Agricultural Science
• Plant Genetics
• Agronomy

Background:

• Deep rooting is crucial for nutrient and water uptake in crops.
• The DEEPER ROOTING 1 (DRO1) gene influences root system architecture in rice.
• Optimizing root systems can enhance crop yield in challenging environments.

Purpose of the Study:

• To investigate the impact of deep rooting on rice grain yield.
• To compare the performance of a deep-rooting rice line (Dro1-NIL) with a shallow-rooting line (IR64).
• To determine the effect of fertilizer application on deep rooting and yield.

Main Methods:

• Utilized two rice lines: IR64 (shallow-rooting) and Dro1-NIL (deep-rooting).
• Grew rice in an irrigated paddy field with and without fertilizer treatment.
• Analyzed root distribution, grain yield, kernel weight, nitrogen uptake, and cytokinin fluxes.

Main Results:

• Dro1-NIL exhibited greater root distribution in lower soil layers compared to IR64.
• Dro1-NIL achieved approximately 10% higher grain yield than IR64, irrespective of fertilizer.
• Enhanced nitrogen uptake and cytokinin fluxes were observed in Dro1-NIL post-heading and during grain filling.

Conclusions:

• Deep rooting, conferred by DRO1, enhances grain yield in rice by improving late-stage nutrient uptake and grain filling.
• The benefits of deep rooting on yield are evident even in the absence of fertilizer.
• Targeting root architecture through genetic modification offers a promising strategy for improving crop productivity.