Starch degradation in the bean fruit pericarp is characterized by an increase in maltose metabolism


Por: Bernal, Lilia, Lujan-Soto, Eduardo, Fajardo-Hernandez, Carlos A., Coello, Patricia, Figueroa, Mario, Martinez-Barajas, Eleazar

Publicada: 1 nov 2022
Resumen:
The bean fruit pericarp accumulates a significant amount of starch, which starts to be degraded 20 days after anthesis (DAA) when seed growth becomes exponential. This period is also characterized by the progressive senescence of the fruit pericarp. However, the chloroplasts maintained their integrity, indicating that starch degradation is a compartmentalized process. The process coincided with a transient increase in maltose and sucrose levels, suggesting that beta-amylase is responsible for starch degradation. Starch degradation in the bean fruit pericarp is also characterized by a large increase in starch phosphorylation, as well as in the activities of cytosolic disproportionating enzyme 2 (DPE2, EC 2.4.1.25) and glucan phosphorylase (PHO2, EC 2.4.1.1). This suggests that the rate of starch degradation in the bean fruit pericarp 20 DAA is dependent on the transformation of starch to a better substrate for beta-amylase and the increase in the rate of cytosolic metabolism of maltose.

Filiaciones:
Bernal, Lilia:
 Univ Nacl Autonoma Mexico, Fac Quim, Dept Bioquim, Ciudad De Mexico 04510, Mexico

Lujan-Soto, Eduardo:
 Univ Nacl Autonoma Mexico, Fac Quim, Dept Bioquim, Ciudad De Mexico 04510, Mexico

Fajardo-Hernandez, Carlos A.:
 Univ Nacl Autonoma Mexico, Fac Quim, Dept Farm, Ciudad De Mexico, Mexico

Coello, Patricia:
 Univ Nacl Autonoma Mexico, Fac Quim, Dept Bioquim, Ciudad De Mexico 04510, Mexico

Figueroa, Mario:
 Univ Nacl Autonoma Mexico, Fac Quim, Dept Farm, Ciudad De Mexico, Mexico

Martinez-Barajas, Eleazar:
 Univ Nacl Autonoma Mexico, Fac Quim, Dept Bioquim, Ciudad De Mexico 04510, Mexico
ISSN: 00319317





PHYSIOLOGIA PLANTARUM
Editorial
Blackwell Munksgaard, 9600 GARSINGTON RD, OXFORD OX4 2DQ, OXON, ENGLAND, Estados Unidos America
Tipo de documento: Article
Volumen: 174 Número: 6
Páginas:
WOS Id: 000899025200001
ID de PubMed: 36453084

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