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The stress‐related phytohormones, salicylic acid (SA) and abscisic acid (ABA), and the three jasmonates, jasmonic acid (JA), cis‐12‐oxo‐phytodienoic acid (cis‐OPDA), and (+)‐7‐iso‐jasmonoyl‐l‐isoleucine (JA‐Ile), were investigated in phloem and xylem exudates of Cucurbita maxima.Phloem and xylem exudates were separately collected and analysed via liquid chromatography–mass spectrometry.We show direct...
Collection of cucurbit exudates from cut petioles has been a powerful tool for gaining knowledge on phloem sap composition without full notion of the complex exudation mechanism. Only few publications explicitly mentioned that exudates were collected from the basal side of the cut, which exudes more copiously than the apical side. This is surprising since only exudation from the apical side is supposedly...
Using apoplastic voltage- and ion selective microprobes, in barley leaves action potentials (APs) have been measured, which propagate acropetally as well as basipetally from leaf to leaf or from root to leaf following the application of mild salt stress (e.g. 30–50 mM KCl or NH4Cl) or amino acids (e.g. 1 mM glutamic acid or 5 mM GABA). Voltage changes were biphasic, followed an ‘all-or-none’ characteristic,...
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