الفهرس 
General introduction and objectivesOnly 14 pages are availabe for public view
 |  | from | 280 |  |  |
| | | from | 280 | | |
Abstract
The studied Hordeum species include: H. marinum Huds., H. murinum L., H.
spontaneum C. Koch. and H. vulgare L. Some of these species included infra-specific
taxa. These species are: H. marinum Huds. has two subspecies (subsp. gussoneanum
(Parl.) Thell., and subsp. marinum) and H. murinum L. has two subspecies (subsp.
leporinum (Link) Arcang., and subsp. glaucum (Steud.) Tzvelev). Hordeum vulgare L. is
the common cultivated species and represented by four cultivars (Giza 123, Giza 124,
Giza 125, and Giza 126) belong to family Gramineae and represented flora of Egypt.
Field, lab and greenhouse studies were carried out to investigate taxonomic
revision, genetic similarity, phenotypic plasticity, salt treatments and phenetic between
wild and cultivated Hordeum taxa. Findings of the present work are summarized in the
following points:
1. The morphological study revealed that, the position of the two subspecies of H.
marinum (subsp. gussoneanum and subsp. marinum) in one group, confirmed its
earlier taxonomic treatment as two subspecies of the same species. Similarly, the
position of H. spontaneum and H. vulgare in one group also confirmed its
treatment as separate closely related species. On the other hand, the position of the
two subspecies of H. murinum (subsp. glaucum and subsp. leporinum) in two
groups, confirmed the dissimilarity between two subspecies and recommended
separation of both subspecies into two separate species namely H. glaucum and H.
leporinum.
2. The molecular study revealed that, the position of the two subspecies of H.
marinum (subsp. gussoneanum and subsp. marinum) in one groups, confirmed its
earlier taxonomic treatment as two subspecies of the same species. On the other
hand, the position of the two subspecies of H. murinum (subsp. glaucum and
subsp. leporinum) in two groups confirmed the dissimilarity between these two
subspecies and considered them as two different species. The position of H.
vulgare in one group confirmed its previous treatment as separate crop cultivar
which related to wild relatives of the two subspecies of H. murinum.