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Beta-amylase expression and starch degradation during banana ripening

by: João R. do Nascimento, Adair V. Júnior, Priscila Z. Bassinello, Beatriz R. Cordenunsi, Janaína A. Mainardi, Eduardo Purgatto, Franco M. Lajolo
Postharvest Biology and Technology, Vol. 40, No. 1. (April 2006), pp. 41-47, doi:10.1016/j.postharvbio.2005.11.008  Key: citeulike:11319714

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Abstract

Starch is the main form of carbon storage in bananas (Musa acuminata, cv. Nanicão) and β-amylase (EC 3.2.1.2) could contribute to starch mobilization during ripening by depolymerizing the α-glucan chains released by the endo-hydrolytic enzymes. This paper reports the cloning of a full-length β-amylase cDNA, along with the activity and expression profiles after treatment with ethylene or its antagonist 1-MCP. According to the results, banana β-amylase activity is highly correlated to a decrease in starch, being primary up-regulated by de novo synthesis. In fruit treated with 1-MCP the amount of β-amylase protein was almost undetectable, even though there was a strong induction of transcription, as a result of the recovering capability for autocatalytic production of ethylene.


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