Work

The role of OsRGA1 in aerenchyma formation and adventitious root growth in rice seedlings based on the U-Gompertz model

Year: 2025

Type: article

Abstract: Aerenchyma in adventitious roots plays a crucial role in rice growth under flooding conditions. However, the mechanisms underlying the dynamic formation process of aerenchyma remain poorly understood, largely due to the time-consuming and labor-intensive nature of traditional sectioning methods for analyzing aerenchyma formation. In this study, we optimized the Gompertz model to investigate the dynamic process of aerenchyma formation and its relationship with root growth. The materials used included the wild-type Nipponbare (NIP) as well as OsRGA1 knockout and overexpression lines, rga1– 5 and RGA1– OE1. All three parameters of the optimized U - Gompertz model directly characterized the dynamic process of aerenchyma formation. Compared to NIP, the rga1– 5 knockout line exhibited significantly lower maximum value and rate of aerenchyma formation, with delays at the initial point, maximum acceleration point, inflection point, maximum deceleration point, and maximum value point. In contrast, RGA1 –OE1 line displayed an opposite trend. Additionally, OsRGA1 upregulated RBOH gene expression, reduced catalase and peroxidase activities, and consequently increased the endogenous H 2 O 2 content from the initial point to the inflection point of aerenchyma formation. As evidenced by the optimized U-Gompertz model, our results demonstrate that OsRGA1 accelerates aerenchyma formation by increasing H 2 O 2 levels, thereby enhancing root activity and promoting root growth in rice.

Source: BMC Plant Biology

DOI: 10.1186/s12870-025-06526-6