Reduction of MDHAR activity in cherry tomato suppresses growth and yield and MDHAR activity is correlated with sugar levels under high light - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Plant, Cell and Environment Année : 2016

Reduction of MDHAR activity in cherry tomato suppresses growth and yield and MDHAR activity is correlated with sugar levels under high light

Résumé

Ascorbate is oxidized into the radical monodehydroascorbate (MDHA) through ascorbate oxidase or peroxidase activity or non-enzymatically by reactive oxygen species. Regeneration of ascorbate from MDHA is ensured by the enzyme monodehydroascorbate reductase (MDHAR). Previous work has shown that growth processes and yield can be altered by modifying the activity of enzymes that recycle ascorbate, therefore we have studied similar processes in cherry tomato (Solanum lycopersium L.) under- or overexpressing MDHAR. Physiological and metabolic characterization of these lines was carried out under different light conditions or by manipulating the source-sink ratio. Independently of the light regime, slower early growth of all organs was observed in MDHAR silenced lines, decreasing final fruit yield. Stomatal conductance and photosynthesis were altered as was the accumulation of hexoses and sucrose in a light-dependent manner in plantlets. Sucrose accumulation was also repressed in young fruits and final yield of MDHAR silenced lines showed a stronger decrease under carbon limitation. Ascorbate and monodehydroascorbate appear to be involved in control of growth and sugar metabolism in cherry tomato and these enzymes could be potential targets for yield improvement

Dates et versions

hal-01323664 , version 1 (30-05-2016)

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Citer

Vincent Truffault, Noé Gest, Cecile Garchery, Alexandra Florian, Alisdair R Fernie, et al.. Reduction of MDHAR activity in cherry tomato suppresses growth and yield and MDHAR activity is correlated with sugar levels under high light. Plant, Cell and Environment, 2016, 39 (6), pp.1279-1292. ⟨10.1111/pce.12663⟩. ⟨hal-01323664⟩
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