Abstract
<title>Abstract</title> <p>This study examined rooting performance of teak (Tectona grandis) micro-cuttings across 10 clones and 3 hormone treatments at 4 concentrations. Root development was categorised into five stages, with hormone application accelerating initiation compared to controls. Statistical analysis showed significant differences among clones and treatments, confirming that rooting ability is strongly genotype-dependent. Descriptive statistics showed variation in rooting rate, root number, length, width, node thickness, and root effect index, with IBA and NAA treatments enhancing root initiation. Grey Relational Analysis (GRA) was applied to multi-trait optimisation, identifying varying IBA treatment concentrations as broadly effective, though clone-specific responses were evident. Time-course regression confirmed progressive improvement in rooting traits (R² > 0.90), with early-rooting clones (TG1, TG4, TG12) showing steep increases, while slow-rooting clones (TG19 and TG20) remained less responsive. The GRA heatmap further emphasised genotype-dependent variation. It is evident that rooting success in teak requires multi-trait evaluation and clone-specific optimisation of hormone type and concentration, especially for mass production.</p>