The Debate on the Pathway of Starch Synthesis:A Closer Look at Low-Starch Mutants Lacking Plastidial Phosphoglucomutase Supports the Chloroplast-Localized Pathway1

摘要

ADPglucose (ADPGlc) is the substrate for starch synthesis in the plastids of higher plants. The glucosyl moiety is used by starch synthases to elongate the glucans that comprise starch. Recently, there has been renewed debate about the ADPGlc synthesis, with the widely accepted or classical pathway questioned and a controversial new pathway proposed. Published experimental results are not entirely consistent with either pathway. Here we focus on starch synthesis in the Arabidopsis (Arabidopsis thaliana) leaf and present our opinion in the debate.