Author
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Lingle, Sarah |
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Submitted to: Agronomy Abstracts
Publication Type: Abstract Only Publication Acceptance Date: 7/5/1996 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Sugarcane (Saccharum spp. hybrid) internodes are often viewed as simple sinks that expand, fill with sugar, and then become quiescent. Few studies have examined sugar metabolism in one internode as it develops. Internodes of 7 cultivars were tagged prior to elongation and sampled at intervals during the next 150 days. Acid invertase (AI), neutral invertase (NI), sucrose synthase (SS), and sucrose-phosphate synthase (SPS) were assayed. Highest during early elongation, specific activity of AI cycled up and down as the internodes aged; each cultivar showed different fluctuations. NI activity tended to be lower during rapid elongation than at other stages, but also fluctuated throughout the experiment. SS activity peaked during rapid elongation, and again about 30 days after tagging. There was less variation with internodes age after full elongation or among cultivars than with the other enzymes. SPS activity increased with internode age in some cultivars, but also showed an oscillation of activity. Sucrose metabolism in mature sugarcane internodes is dynamic. Sucrose may continue to be imported into internodes even after peak sucrose concentration is reached. |
