Exogenous sucrose supply changes sugar metabolism and reduces photosynthesis of sugarcane through the down-regulation of Rubisco abundance and activity
Photosynthetic modulation by sugars has been known for many years, but the biochemical
and molecular comprehension of this process is lacking. We studied how the exogenous
sucrose supplied to leaves could affect sugar metabolism in leaf, sheath and stalk and
inhibit photosynthesis in four-month old sugarcane plants. Exogenous sucrose 50 mM
sprayed on attached leaves strongly impaired the net CO 2 assimilation (PN) and decreased
the instantaneous carboxylation efficiency (PN/Ci), suggesting that the impairment in …
and molecular comprehension of this process is lacking. We studied how the exogenous
sucrose supplied to leaves could affect sugar metabolism in leaf, sheath and stalk and
inhibit photosynthesis in four-month old sugarcane plants. Exogenous sucrose 50 mM
sprayed on attached leaves strongly impaired the net CO 2 assimilation (PN) and decreased
the instantaneous carboxylation efficiency (PN/Ci), suggesting that the impairment in …
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