Lipids in the germ,endosperm and pericarp of the developing maize kernel |
| |
Authors: | S L Tan W R Morrison |
| |
Affiliation: | (1) Department of Food Science and Nutrition, University of Strathclyde, 131 Albion Street Glasgow, G1 1SD Scotland, UK |
| |
Abstract: | Acyl lipids were quantified in the germ, endosperm and pericarp of LG-11 maize kernels at eight stages of development from
9 to 87 days after pollination (DAP). Changes in the lipids are discussed in relation to morphological events in the developing
kernel. Storage lipids (triglyceride, steryl ester) and membrane lipids (diacylphospholipids) accumulated in germ until 52-76
DAP, then decreased slightly without formation of lipid degradation products, lated in endosperm until 36-42 DAP and then
decreased. Maximum values for galactosyldiglycerides and diacylphospholipids (nonstarch lipids) were reached at 16-23 DAP,
and all decreased to very low values at maturity. Loss of these functional (membrane) lipids during the period of endosperm
cell filling is unexpected. Starch contained 82% of the lysophospholipids and 64% of the free fatty acids in endosperm at
76 DAP. Endosperm lysophospholipids increased until 76 DAP and then decreased slightly, while free fatty acids increased continuously
mostly inside starch granules at all stages of development, and any possible decrease after 76 DAP was masked by acids formed
by hydrolysis of aleurone and endosperm nonstarch lipids from 52 DAP. In DAP, and phospholipids decreased after 42 DAP. Loss
of these lipids is associated with senescence of most pericarp tissue. Triglycerides and steryl esters accumulated steadily
to maturity, while the main accumulation of unsaponifiables occurred after 52 DAP about the time of suberin formation. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|