Genotypic variation in lysophospholipids of milled rice

Chuan Tong
Lei Liu
Daniel LE Waters, Southern Cross University
Terry J. Rose, Southern Cross University
Jinsong Bao
Graham J. King, Southern Cross University

Abstract

Phospholipids (PLs) play a prominent role in both grain cellular structure and Phospholipids (PLs) play a prominent role in both grain cellular structure and nutritional function of cereal crops. Their lyso forms (lysophospholipids, LPLs) often combine with cereal starch to form an amylose-lipid complex (ALC) which may influence starch properties. In this study, 20 rice accessions were grown over two seasons at the same location to explore diversity in LPLs of milled rice. Levels of specific LPLs differed significantly among rice genotypes, demonstrating there is a wide diversity in LPLs in rice grain. The main LPL components were lysophosphatidylcholine (LPC)16:0 (ranging from 3009.7 to 4697.8μg/g), LPC18:2 (836.6-2182.3μg/g), lysophosphatidylethanolamine (LPE)16:0 (625.7 - 1139.8μg/g) and LPE18:2 (170.6 - 481.6μg/g). Total LPC, total LPE and total LPL ranged from 4727.1 to 7685.2μg/g, from 882.8 to 1809.5μg/g, and from 5609.8 to 9401.1μg/g, respectively. Although significant (P