This study investigated the effects of seed priming with Chaetomorpha sp. seaweed extract on seed germination and seedling growth of chili pepper. The objective was to examine the influence of seaweed extract concentrations on seed germination and seedling development. Seeds were primed in different concentrations of Chaetomorpha sp. extract, compared with a control treatment. The experiment was conducted using a completely randomized design with four replications.

Results showed that:

• Seed priming with seaweed extract enhanced seed germination characteristics.
• Primed seeds exhibited improved germination percentage, germination index, and germination rate compared to the control.
• Seedlings from primed seeds showed enhanced root and shoot development.

This study demonstrates the potential of Chaetomorpha sp. extract as a promising seed priming agent for improving chili pepper seed quality, which can be applied in the production of high-quality chili pepper seedlings.