High-biomass C₄ grasses-Filling the yield gap

Area of Science:

• Agricultural Science
• Plant Biology
• Biotechnology

Background:

• Global population growth necessitates a 2050 agricultural productivity increase without expanding land or water use.
• Slowing rates of grain yield improvement present a significant challenge to meeting future food demands.
• High-biomass C4 grasses are being investigated as a potential solution to bridge the projected yield gap.

Purpose of the Study:

• To review the potential of high-biomass C4 grasses in enhancing agricultural productivity.
• To explore the traits of C4 grasses that contribute to high yield and resource efficiency.
• To assess the suitability of C4 grasses for animal feed and biofuel production.

Main Methods:

• Review of existing literature on C4 photosynthesis, biomass accumulation, and crop modeling.
• Analysis of physiological traits contributing to high yield in C4 grasses, including drought tolerance and light utilization.
• Examination of genetic and regulatory pathways influencing flowering time and hybrid development.

Main Results:

• High-biomass C4 grasses possess traits like C4 photosynthesis, extended growth duration, and efficient resource capture, leading to high yields.
• These grasses demonstrate significant drought tolerance, making them suitable for water-limited agricultural areas.
• Engineering non-structural carbohydrate accumulation in C4 grass stems can enhance biomass yield and utility.
• Elucidation of flowering regulatory pathways enables the production and deployment of C4 grass hybrids.

Conclusions:

• High-biomass C4 grasses present a viable strategy to increase agricultural productivity and address future food security challenges.
• Their efficient resource utilization and drought tolerance make them ideal for marginal lands and water-scarce regions.
• C4 grasses can be developed into versatile feedstocks for animal feed and biofuel production, contributing to a sustainable bioeconomy.