Guard cell malic acid metabolism during stomatal movements

摘要: THE mechanism by which stomata open and close has long been a puzzle, but only now are we beginning to make major advances in our understanding of their metabolism. It concluded that guard cells can fix CO2 incorporate it into starch1–3. shown the bulk of, if not all, fixed is converted oxaloacetic acid (OAA) phosphoenolpyruvate carboxylase OAA, turn, reduced malic acid3,4. Some amination OAA producing aspartate also detected4. Although there indirect evidence suggesting and/or malate provide carbon for starch synthesis cells4 direct this lacking. We have investigated some characteristics cell fixation directly results organic formation precursor formation.