This study was carried out at Karahta station, Department of Field Ccrops
researches, General Commission for Scientific Agriculture Researches
(GCSAR), Damascus Country Side, Syria during the 2009-2010and 2010-2011
growing seasons to estimate gene
action for grain yield and its components.
Seeds of the durum wheat hybrid (Sham5 X Azgar1) were grown in three
replicates. Results indicated that the used genotypes had good variation to be
used as parents in wheat hybridization program to achieve significant genetic
advance. Mean square results showed significant differences among mean
values of the five populations for all studied traits in the hybrid and in most
traits, epistasis or dominance gene action occupied the first rank to the genetic
effects. It was suggested that selection for most studied traits in the subsequent
generations is relatively more effective than in early generations.
A field experiment was conducted at two environmentally different locations
(Damascus and Dara'a), to evaluate the performance of 16 barley genotypes
under rainfed conditions during the growing season of 2011-2012 in order to
study in the response
of some quantitative traits and determine the yield under
drought conditions. The experiment was laid out according to the factorial
complete randomized block design with three replicates for each genotype.
Significant genetic variation was found in the response of barley genotypes to
water stress. The performance of all genotypes was significantly superior in the
less dry region (Izra’a-Daraa) compared to the more dry one (Abo jarash-
Damascus) for all the examined parameters. Results revealed that the number
of grains per spike was significantly higher in most lines compared to Arabi
Abiad and Arabi Aswad, and the number of grains per spike was significantly
higher in the line29 (43.17 grain per spike). The number of grains per m2 was
significantly higher in line29,line64, Arabi Abiad and line14 (11177, 10809, 10802,
10744 grains per m2), respectively. The mean grain yield was significantly
higher in the line64, line14 and Arabi Abiad. (479.3, 476 and 443 gram per m-2),
respectively. Harvest index was significantly higher in all lines compared to
Arabi Abiad and Arabi Aswad.
A field experiment was conducted for two consecutive seasons 2006 – 2007
and 2007 – 2008 to investigate the effect of removing early developed buds on
growth, yield and some lint proprieties. Treatments involved in the experiment
included three le
vels of bud removal (0%, 50%, and 100%) at three times (one,
two and three weeks after budding). The treatments were arranged in FRCBD,
with three replications. Growth parameters (plant height, number of
nodes/plant, number of leaves/plant, and number of branches/plant) cotton
seed yield, lint yield and lint properties were investigated. The results revealed
that bud removal significantly increased plant height, number of nodes, cotton
seed yield and lint yield, uniformity (UR) and lint strength (HVI). Also the
results showed that, time of bud removal significantly affected growth
parameters, cotton seed yield and lint cotton. The results indicated that,
varieties and time of bud removal interaction had a significant affect on growth
parameters. While, percentage of bud removal and time of bud removal
interaction had a significant effect only on cotton seed yield and strength of lint.
The results showed that, there were significant difference between cultivars in
plant height and number of branches per plant, with cultivar Barakat – 90 the
best.
نفذت الدراسة في حقول قسم بحوث الذرة التابع للهيئة العامة للبحوث العلمية الزراعية في دمشق , سورية خلال الموسمين الزراعيين 2011 و2012 , حيث تم خلال الموسم الزراعي 2011 تكوين حبوب العشائر الست لأربعة هجن فردية من الذرة الصفراء وتم خلال موسم 2012 تقييم ا
لعشائر الست للهجن الأربعة في موعديين زراعيين 12-5 كموعد مبكر و12-6 كموعد متأخر .
