@article{Warrier RR_Gopika R_Rajesh C_Mahalakshmi R_Sathiya A_Jacob JP_2022, title={ADVENTITIOUS ROOT FORMATION AND ASSOCIATED BIOCHEMICAL CHANGES IN MICRO SHOOTS OF <em>TECTONA</em> <em>GRANDIS</em> CLONES}, volume={34}, url={https://jtfs.frim.gov.my/jtfs/article/view/1777}, abstractNote={&lt;p&gt;Globally, &lt;em&gt;Tectona grandis&lt;/em&gt; (teak) is mass-produced through tissue culture. Being a perennial species, an understanding of adventitious rooting would significantly increase its production. This study investigated biochemical and histological changes and media compaction associated with rooting in eight tissue-cultured &lt;em&gt;T. grandis&lt;/em&gt; clones. Root emergence was observed from the 3&lt;sup&gt;rd&lt;/sup&gt; to 8&lt;sup&gt;th&lt;/sup&gt; day in 4–5 cm long shoots treated with 5 mM indole-3-butyric acid (IBA). Root primordia became visible after 3 days in good rooters while root initiation, elongation and root emergence occurred between the 3&lt;sup&gt;rd&lt;/sup&gt; and 7&lt;sup&gt;th&lt;/sup&gt; day depending on the clone. Grade 5 vermiculite facilitated root formation and improved primary and secondary root thickness and length. Sugars and proteins increased during root initiation from day 1 to 3, reflecting active cell division using available energy sources. An initial low, followed by increased indole-3-acetic acid (IAA) levels revealed inhibition of endogenous auxin due to external supply, replaced later by the shoot’s auxin. The polyphenol oxidase (PPO) and indole-3-acetic acid oxidase (IAAO) levels increased during rhizogenesis. Therefore, it is clear that sugars, enzymes and proteins play a significant role during various rooting phases. The findings indicated the influence of biochemical pool composition on root system architecture. Genotype variation demands clone-specific protocols for successful commercial propagation of the species.&lt;/p&gt;}, number={4}, journal={Journal of Tropical Forest Science (JTFS) }, author={Warrier RR and Gopika R and Rajesh C and Mahalakshmi R and Sathiya A and Jacob JP}, year={2022}, month={Oct.}, pages={393–405} }