Rm. Madakadze et al., Identification and characterization of storage proteins in zygotic and somatic embryos of geranium (Pelargonium xhortorum), J AM S HORT, 125(4), 2000, pp. 525-529
Citations number
27
Categorie Soggetti
Plant Sciences
Journal title
JOURNAL OF THE AMERICAN SOCIETY FOR HORTICULTURAL SCIENCE
Storage proteins in zygotic and somatic embryos of 'Scarlet Orbit Improved'
, zonal geranium (Pelargonium xhortorum L.H. Bail.) were identified and cha
racterized using gel electrophoresis. The major seed storage proteins in zy
gotic embryos were an 11S globulin and two low molecular weight (LMW1-2) pr
oteins. The 11S globulin consisted of four distinct subunits (53-74 ku), wi
th each subunit being composed of an acidic polypeptide (A(1)-A(4); 28-41 k
u) linked via disulphide bonds to a basic polypeptide (B-1-B-4; 20-25 ku) a
nd was named pelargin. The LMW (15.5 and 12,5 ku) albumins were not linked
with disulphide bonds. Mature somatic embryos contained 80 % of the protein
s in zygotic embryos, Although protein profiles were more distinct in matur
e somatic embryos compared to nonmature, none of the zygotic embryo storage
protein was present in the somatic embryos, indicating lack of complete ma
turity of somatic embryos. This study identified zygotic embryo proteins an
d demonstrated that maturation of somatic embryos improves protein content
and types of proteins.