ISSN:
1432-2048
Keywords:
Leaf
;
Oleosomes
;
Puccinia infection
;
Senescence (leaves)
;
Triacylglycerol
;
Triticum
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Oleosomes, up to 14μm in diameter, were found in mesophyll and bundle sheath cells of the flag and lower leaves of wheat cv Professeur Marchal. They develop in flag leaves at least 10 d before anthesis, possibly from fatty acids secreted by the plastids, and persist in mature and senescing leaf tissue. Oleosomes are bordered with an osmiophilic layer rather than a unit membrane. The major lipids of oleosomes, isolated 20 d after anthesis, are triacylglycerols (50%) and sterol or wax exter (34%). The dominant fatty acids of both lipid classes are plamitic (16:0) and stearic (18:0) acids which accounts for the low osmiophilia of the oleosomes. The function of the oleosomes is unknown but they may act as short-term energy reserves. Oleosomes persist in leaves infected with brown rust, even in cells penetrated by haustoria. Yellowish-brown oleosomes found in senescing and rust-infected leaves may be formed by the release and coalescence of pigmented plastoglobuli.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00384982
Permalink
