Biologia plantarum 60:579-584, 2016 | DOI: 10.1007/s10535-016-0608-4
Phenylalanine biosynthesis and its relationship to accumulation of capsaicinoids during Capsicum chinense fruit development
- 1 Unidad de Bioquímica y Biología Molecular de Plantas, Centro de Investigación Científica de Yucatán, Mérida, Yucatán, México
Activities of phenylalanine (Phe) biosynthetic enzymes chorismate mutase (CM) and arogenate dehydratase (ADT) and of phenylalanine ammonia lyase [PAL, an enzyme that directs Phe towards capsaicinoid (CAP) synthesis] were analyzed during Capsicum chinense Jacq. (habanero pepper) fruit development. A maximum CM activity coincided with a maximum CAP accumulation. However, ADT exhibited two activity peaks, one during the early phase (10 - 17 days post-anthesis, DPA) and another during the late phase (35 - 37 DPA); only the latter coincided with CAP. Interestingly, PAL activity was inversely related to CAP accumulation; lower activities coincided with a maximum CAP content. These results suggest the operation of a control mechanism that coordinated Phe synthesis and its channeling towards CAP synthesis during the course of fruit development.
Keywords: arogenate dehydratase; chorismate mutase; fruit placenta; habanero pepper; phenylalanine ammonia lyase
Subjects: phenylalaine; capsaicinoid biosynthesis; fruit development; arogenate dehydratase; chorismate mutase; phenylalanineammonia lyase; habanero pepper
Received: June 1, 2015; Revised: October 15, 2015; Accepted: November 11, 2015; Published: September 1, 2016 Show citation
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