Sink strength regulates photosynthesis in sugarcane

A. J. McCormick*, M. D. Cramer, D. A. Watt

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The relationship in sugarcane (Saccharum spp.) between photosynthetic source tissue and sink material was examined through manipulation of the sink:source ratio of field-grown Saccharum spp. hybrid cv. N19 (N19).

To enhance sink strength, all leaves, except for the third fully expanded leaf, were enclosed in 90% shade cloth for varying periods of time. Variations in sucrose, glucose and fructose concentrations were measured and the effects of shading on the leaf gas exchange and fluorescence characteristics recorded. Changes in carbon partitioning caused by shading were examined based on the uptake and translocation of fixed (14)CO(2).

Following a decline in sucrose concentrations in young internodal tissue and shaded leaves, significant increases in the CO(2)-saturated photosynthetic rate (J(max)), carboxylation efficiency (CE) and electron transport rate were observed in unshaded leaves after 8 d of shading treatment.

It was concluded that up-regulation of source-leaf photosynthetic capacity is correlated with a decrease in assimilate availability to acropetal culm sink tissue. Furthermore, a significant relationship was revealed between source hexose concentration and photosynthetic activity.

Original languageEnglish
Pages (from-to)759-770
Number of pages12
JournalNew Phytologist
Volume171
Issue number4
DOIs
Publication statusPublished - 2006

Keywords

  • C(4)
  • partitioning
  • photosynthesis
  • sink
  • source
  • sucrose
  • sugarcane (Saccharum spp.)
  • SUCROSE-PHOSPHATE SYNTHASE
  • TRANSGENIC TOBACCO PLANTS
  • CALVIN-CYCLE ENZYMES
  • GENE-EXPRESSION
  • SIGNAL-TRANSDUCTION
  • C-4 PLANTS
  • CHLOROPHYLL FLUORESCENCE
  • LEAF PHOTOSYNTHESIS
  • CELL-WALL
  • ACCUMULATION

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