The effect of water stress on the composition and biosynthesis of phospholipids in yellow lupin seeds and triticale kernels

An analysis has been made of yellow lupin seeds (cv. June) and triticale ke rnels (cv. Dagro), produced by plants exposed to water stress for 21 days a fter the initial flowering of the first node of lupin and initial earing of triticale. Seed embryos of triticale as well as embryonic axes and cotyled ons of lupin contained phosphatidylinositol (PI), phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidic acid (PA), phosphatidylglycero l (PG), and two unidentified phospholipids (PX1, PX2). Water stress had a s timulating effect on the PC and PE contents of triticale embryos and lupin cotyledons. Cotyledons also contained detectable amounts of phosphatidylser ine (PS), the levels of which decreased due to drought. During two - four h ours' incubation of embryos, axes and cotyledons at 25 degrees C, the synth esis of the phospholipids varied. Drought during seed development stimulate d the biosynthesis of PG and PX2, but lowered that of PA and PX1, recorded as the amount of C-14-sodium acetate bound into the phospholipids.