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Changes in soluble carbohydrates and activities of sucrose-cleaving enzymes during tuberization of Pachyrhizus erosus (L.) Urban

Abstract : Developmental time course of soluble carbohydrates as well as sucrose metabolizing enzymes were determined in Yam bean (Pachyrhizus erosus) tap root under inductive environment. Until 5 weeks after sowing (WAS), tap root contained essentially sucrose (Suc). From 6 WAS (starting of tuber bulking), glucose (glc) and fructose (Fru) concentration increased greatly. The ratio of Fru to Glc was close to 1 during tuberization, indicating that Suc was very likely hydrolysed via invertase. Activities of sucrose synthase and neutral invertase were high whereas acid invertase activity was quite low. Neutral invertase activity increased by 3 between 5 and 7 WAS, but sucrose synthase and acid invertase activities remained unchanged. The levels of fru, glc and neutral invertase were positively correlated indicating its main role in the accumulation of reserve sugars in developing tuber.
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https://hal.inrae.fr/hal-03152554
Contributor : Victor Vaillant <>
Submitted on : Thursday, February 25, 2021 - 4:34:49 PM
Last modification on : Friday, June 18, 2021 - 5:42:01 PM

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  • HAL Id : hal-03152554, version 1

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Lucienne Desfontaines, Victor Vaillant, Philippe Constant. Changes in soluble carbohydrates and activities of sucrose-cleaving enzymes during tuberization of Pachyrhizus erosus (L.) Urban. 2nd International Symposium on tuberous legume, Aug 1996, Celaya, Mexico. ⟨hal-03152554⟩

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