A study was conducted on one type of Syrian pears ‘Pyrus syriaca. Boiss’ which is
widespread in Al-Qardahah area/Lattakia during 2012-2013. 9 superficial models were
studied, these are scattered in different locations (Ein Al Aaros , Derhana, and B
sin).
The results revealed the existence of differences in some of the characteristics, out of
13 morphological studied characteristics. A cluster analysis showed a division in the
studied models. Two main groups can be distinguished: the first group included the
following models (P1, P2, P3, P4, P5, P6), whereas the second group included the
following models (P7, P8, P9). These two main groups are further divided into 4 subgroups
which can be considered independent morphological Models.
The first main group contains the first and second subgroups with a similarity value
0.62. The first subgroup contains P1, P2, P3, P4, P5, and it is symbolized as A; while the
second subgroup contains P6 and it is symbolized as B.
The second main group contains the first and second subgroups with a similarity
value 0.77. The first subgroup contains P7, P9 and it is symbolized as C; whereas the
second subgroup contains P8 symbolized as D.
The research indicates that there is a difference in the seed germination percentage of
the studied models. The seeds and embryos of P9 gave the highest germination percentage,
while the seeds and embryos of P6 gave the fastest germination percentage.
This study was carried out through the cooperation between Faculty of
Agricultural Damascus University and General Commission of Agricultural
Scientific Researches in Karahta station of field crops researches during 2010-
2011 and 2011-2012 succes
sive seasons. Four hybrids of durum wheat namely
(Duma1*Sauady), (Buhuth9*Q88), (Sham7*Q130) and (Horaney*Q131) were
evaluated to estimate heritability, genetic advance, heterosis and inbreeding
depression for days to heading ,grain filing period, plant height, number of
spikes per plant, and number of grains per plant. The mean average for all
these traits revealed highly significant differences among crosses. Low in
protein content trait (23-69%), medium in grain yield per plant (38-70) and
high heritability in thousand kernel weight (62-81%) were found. All hybrids
showed the highest for both mid and better parents heterosis for protein
content and gluten traits. High heritability was accompanied by high genetic
advance for thousand kernel weight. Low heritability was coupled with low
genetic advance for grain yield per plant, protein content and gluten. However,
greater magnitude of heritability coupled with higher genetic advance in some
traits provided that these parameters were under the control of additive genetic
effects. This indicates that selection should lead to fast genetic improvement of
the material. Moreover, the high genetic correlations for most of the traits,
suggested a strong inherent association among these traits at the genetic level.
Thus these traits deserve better attention in future breeding programs for
evolving better wheat in stress environments.
Several laboratory experiments were conducted to evaluate the response of
ten ACSAD durum and bread wheat landraces to salinity stress tolerance at
seedling stage. The salinity induction response technique was applied to assess
the genetic variabi
lity, and the effect of induction nature in improving the
tolerance to lethal levels of some abiotic stresses (drought and salinity). The
applied screening tool was rapid and efficient in assessing the genetic
variability for the response of studied durum and bread wheat landraces to
salinity stress tolerance.
This investigation is a mimesis to what usually happens in nature, where the
plants are normally exposed to sublethal environmental stresses before their
exposure to the lethal level of stresses.
The gradual increase of environmental stress, gives
plants a suffficient time
to prepare their defensive means to withstand the lethal level of stress. In order
to develope a suitable screening technique, it was essential to determine the
induction as well as the lethal levels of stress, as important components of such
proposed tool.
This technique was applied to screen some tomato genotypes, and assess the
genetic variability among them, in order to evaluate their salinity stress
response , and selecting the highly salt tolerant types.
Determination of the optimum induction and lethal levels of stress are
considered the most important prerequisites for the proposed screening
technique. This research was conducted at the Faculty of Agriculture at
Damascus University in the year ٢
٠٠٠. The main objective of this investigation
was to screen sorghum lines for heat stress tolerance and determine the
effectiveness of the proposed technique in screening for this environmental
stress at the seedling stage.
The research was conducted at Abo-Jarash farm, faculty of
agriculture, Damascus university during the two growing season
2011-2012 and 2012-2013 in order to evaluate genetic variability of
some lentils genotypes based on some physiological and
productivity traits associated with drought tolerance. The
experiment was laid out according to factorial randomized complete
block design with three replications.
