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Croissance et développement du Pachyrhizus erosus Urban, 2: Effets de l'acide gibbérellique et du chlorure de chlorocholine sur la composition glucidique du tubercule

by Zinsou, C; Vansuyt, G; Venthou-Dumaine, A.
Publisher: 1987Subject(s): PACHYRHIZUS EROSUS | ACIDO GIBERELICO | SUSTANCIAS DE CRECIMIENTO VEGETAL | COMPOSICION QUIMICA | GIBBERELLIC ACID | PLANT GROWTH SUBSTANCES | CHEMICAL COMPOSITION | ACIDE GIBBERELLIQUE | SUBSTANCE DE CROISSANCE VEGETALE | COMPOSITION CHIMIQUE In: Agronomie (Francia) v. 7(10) p. 821-825Summary: The effects of gibberellic acid (GA3) and chlorocholine chloride (CCC) on carbohydrate composition of tuberous root of yam bean, Pachyrhizus erosus (Urban) were investigated during its development under short-day conditions. Soluble carbohydrate level was increased by Ga3 but reduced by CCC, only the reducing sugars being affected in the latter' case. Sucrose, which disappeared from the tuber at the beginning of pod setting in the control plants, was maintained by application of each of the two growth regulators. CCC and GA3 both increased starch content in the tuberous root. GA3 promoted early starch synthesis and storage at the same time as sucrose accumulation. The effect of CCC was observed only at pod bulking, when it inhibited the starch content decrease seen in control plants. The sucrose and starch increases brought about by the two growth factors, which usually have opposite effects on tuber plants, are discussed.
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Ilus. 13 ref. Sum. (En, Fr)

The effects of gibberellic acid (GA3) and chlorocholine chloride (CCC) on carbohydrate composition of tuberous root of yam bean, Pachyrhizus erosus (Urban) were investigated during its development under short-day conditions. Soluble carbohydrate level was increased by Ga3 but reduced by CCC, only the reducing sugars being affected in the latter' case. Sucrose, which disappeared from the tuber at the beginning of pod setting in the control plants, was maintained by application of each of the two growth regulators. CCC and GA3 both increased starch content in the tuberous root. GA3 promoted early starch synthesis and storage at the same time as sucrose accumulation. The effect of CCC was observed only at pod bulking, when it inhibited the starch content decrease seen in control plants. The sucrose and starch increases brought about by the two growth factors, which usually have opposite effects on tuber plants, are discussed.

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