δ13C of CO2 respired in the dark in relation to δ13C of leaf metabolites: comparison between Nicotiana sylvestris and Helianthus annuus under drought

• DOI: 10.1046/j.1365-3040.2001.00699.x
• Publication Date: 2003-03-12T16:25:06Z
• Authors: J. Ghashghaie; M. Duranceau; F.‐W. Badeck; G. Cornic; M.‐T. Adeline; E. Deleens
• Keywords: Helianthus annuus

ABSTRACT The variations of δ 13 C in leaf metabolites (lipids, organic acids, starch and soluble sugars), matter CO 2 respired the dark from leaves Nicotiana sylvestris Helianthus annuus were investigated during a progressive drought. Under well‐watered conditions, was C‐enriched compared to sucrose by about 4‰ N. 3‰ 6‰ two different sets experiments H. plants. In previous work on cotyledonary Phaseolus vulgaris , we observed constant C‐enrichment sucrose, suggesting fractionation respiration, whatever age relative water content. contrast, increased dehydrated decreased comparison with control We conclude that (i) carbon isotope respiration is widespread phenomenon occurring 3 plants, but (ii) this not varies among species (iii) it also environmental conditions (water deficit present work) differently species. (iv) discrimination processes occurred, releasing enriched several major reserves (carbohydrates, lipids acids) whole matter.