ISSN: 0041-3216

ISSN: 0041-3216 (Online), 0041-3216 (Print)
Volume 57 Number 3
Research Papers
Factors affecting diurnal trends of 14C fixation in sugar-cane
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The diurnal patterns of 14C fixation, translocation, stomatal resistance, and sucrose content in the free space of the storage tissue were monitored for two contrasting clones of sugar-cane. Fixation was related to irradiance early and late in the day, but a characteristic midday decline in both fixation and translocation was found to be unrelated to irradiance or stomatal resistance. There was inconclusive evidence to support the hypothesis that the free space, by acting as a temporary storage site during periods of intensive photosynthesis, may contribute to the alleviation of product repression of photosynthesis.