HYPOCOTYLS
\hˌa͡ɪpə͡ʊkˈɒta͡ɪlz], \hˌaɪpəʊkˈɒtaɪlz], \h_ˌaɪ_p_əʊ_k_ˈɒ_t_aɪ_l_z]\
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The region of the stem beneath the stalks of the seed leaves (cotyledons) and directly above the young root of the embryo plant. It grows rapidly in seedlings showing epigeal germination and lifts the cotyledons above the soil surface. In this region (the transition zone) the arrangement of vascular bundles in the root changes to that of the stem. (From Concise Dictionary of Biology, 1990)
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Word of the day
Dopamine Acetyltransferase
- An enzyme that catalyzes the of groups from acetyl-CoA to arylamines. They have wide specificity for aromatic amines, particularly serotonin, and can also catalyze acetyl transfer between arylamines without CoA. EC 2.3.1.5.