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Water-deficit accumulates sugars by starch degradation--not by de novo synthesis--in white clover leaves (Trifolium repens).

Lee, Bok-Rye; Jin, Yu-Lan; Jung, Woo-Jin; Avice, Jean-Christophe; Morvan-Bertrand, Annette; Ourry, Alain; Park, Chan-Woo; Kim, Tae-Hwan.
Physiol Plant; 134(3): 403-11, 2008 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-18785903
Labeling 13CO2 in steady-state condition was used to estimate quantitative mobilization of recently fixed carbon or stored sugar during water-deficit in white clover (Trifolium repens L.). Water-deficient gradually decreased leaf-water parameters and total amount of recently fixed carbon. Amount of 13C incorporated into glucose, sucrose and soluble sugars fraction rapidly decreased after 3 days of water-deficit treatment. In contrast, the previously stored soluble sugars significantly increased after 5 days of water-deficit with a coincidence of significant decrease in starch concentration. A highly significant (P < or = 0.001) relationship between the decrease in leaf-water potential caused by water-deficit and the increase in ratio of soluble sugar/starch concentration was observed in water deficit-stressed plants. The data indicate that soluble carbohydrate accumulated by water-deficit treatment is mainly because of the hydrolysis of previously stored starch rather than to de novo synthesis.
Selo DaSilva