plants-vr-tropical-04-canna-imperata

plants-vr-tropical-04-canna-imperata - continues the...

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Vegetative reproduction (tropical) 4 Rhizomes - Canna lily and Imperata grass In plants with rhizomes, the stem remains below ground but continues to grow horizontally. The old part of the stem does not die away as in bulbs and corms but persists for several years. In the Canna lily rhizome, the terminal bud turns up and produces leaves and flowers above ground. The old leaf bases form circular scales round the rhizome, which is swollen with food reserves. The Imperata grass rhizome forms in a similar way but does not become swollen with stored food. Life cycle ( see p. 7 of ‘Vegetative reproduction’). The life cycle of a rhizome is similar to that of a corm. Food from the leaves passes back to the rhizome, and a lateral bud uses it, grows horizontally under ground, and so
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Unformatted text preview: continues the rhizome. Other lateral buds produce new rhizomes which branch from the parent stem. The terminal buds of these branches curve upwards and produce new leafy shoots and flowers. Contractile roots grow from the nodes of the underground stem and keep it at a constant depth. The Canna lily is grown largely for its leaves and flowers. Imperata cylindrica is a widespread wild grass shoot from terminal bud old flowering shoot from previous growth swollen stem (rhizome) stumps from previous aerial shoots Canna lily rhizome scales from withered leaf bases adventitious roots Imperata grass © D.G. Mackean shoot from terminal bud lateral bud will continue growth of rhizome scale leaves horizontal stem (rhizome) adventitious roots dried up leaf bases...
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This note was uploaded on 11/29/2011 for the course BIO 218 taught by Professor Young during the Fall '11 term at BYU.

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