Analysis of root system architecture in rice indicates limited varietal adaptations

Abstract

Plant roots are the primary organs that sense and respond to soil-derived stresses. A healthy root system architecture reflects a plant’s adaptive potential. In this study, we analyzed root traits of 286 rice varieties grown in hydroponic and pot culture systems. The results revealed considerable variation and significant correlations for root traits across both systems. Cluster analysis partitioned the genotypes into two clusters, with total root length, surface area and root diameter as major determinants of variation. The results highlight marginal changes in root system traits within the indica group, resulting in distinct behaviors under pot culture conditions. However, the Aus/Boro subgroup did not exhibit similar patterns. The study underscores the importance of further investigating root system traits to achieve adaptive improvements, aiming to enhance the efficiency and effectiveness of root breeding programs. Understanding these variations can lead to the discovery of desirable traits and the development of superior rice varieties with efficient root systems.