# ChronoRoot 2.0: an open AI-powered platform for 2D temporal plant phenotyping

## TL;DR

ChronoRoot 2.0 is an open-source platform that improves plant root and shoot analysis using AI, enabling detailed and accessible phenotyping across multiple plant structures and species.

## Contribution

ChronoRoot 2.0 introduces a multi-class segmentation AI model and dual interfaces for detailed and high-throughput plant phenotyping.

## Key findings

- ChronoRoot 2.0 tracks six plant structures including roots, shoots, and leaves with improved accuracy.
- The platform enables high-throughput screening and analysis of gravitropic responses and circadian growth patterns.
- Validation with Arabidopsis and tomato demonstrates the system's effectiveness across species.

## Abstract

Plant developmental plasticity, particularly in root system architecture, is fundamental to understanding adaptability and agricultural sustainability. Existing automated phenotyping solutions face limitations, including binary segmentation approaches, restricted structural analysis capabilities, and text-based interfaces that limit accessibility, with most focusing solely on root structures while overlooking valuable information from simultaneous analysis of multiple plant organs.

ChronoRoot 2.0 builds upon established low-cost hardware while significantly enhancing software capabilities and usability. The system employs nnUNet architecture for multi-class segmentation, demonstrating significant accuracy improvements while simultaneously tracking 6 distinct plant structures encompassing root, shoot, and seed components: main root, lateral roots, seed, hypocotyl, leaves, and petiole. This architecture enables easy retraining and incorporation of additional training data without requiring machine learning expertise. The platform introduces dual specialized graphical interfaces: a Standard Interface for detailed architectural analysis with novel gravitropic response parameters and a Screening Interface enabling high-throughput analysis of multiple plants through automated tracking. Functional principal component analysis integration enables discovery of novel phenotypic parameters through temporal pattern comparison. We demonstrate multi-species analysis, with Arabidopsis thaliana and Solanum lycopersicum, both morphologically distinct plant species. Three use cases in Arabidopsis thaliana and validation with tomato seedlings demonstrate enhanced capabilities: circadian growth pattern characterization, gravitropic response analysis in transgenic plants, and high-throughput etiolation screening across multiple genotypes.

ChronoRoot 2.0 maintains the low-cost, modular hardware advantages of its predecessor while dramatically improving accessibility through intuitive graphical interfaces and expanded analytical capabilities. The open-source platform makes sophisticated temporal plant phenotyping more accessible to researchers without computational expertise.

https://chronoroot.github.io