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Register a new userالعلاقة بين التمثيل الضوئي الصافي للورقة الأخيرة (العلم) مع بعض الخصائص المورفوفيزيولوجية في الشعير Hordeum vulgar
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Damascus University ورقة بحثية
Publication date
2002
fields
Field Crops
and research's language is
العربية
Authors
بدر جابر( باحث )
Created by
Shamra Editor
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تعتمد الغلة القصوى لمحصول الشعير من الحبوب على عوامل كثيرة، يأتي في مقدمتها، فعالية التمثيل الضوئي الكلي للورقة العلم لأنها المسؤولة عن إنتاجية المادة الجافة خلال مراحل النمو و نضج الحبة. بينت لنا الدراسة أن معدل التمثيل الضوئي الكلي للورقة العلم و هو العامل المحدد لإنتاجية السنبلة الرئيسية من الحبوب - يتوقف على محتوى الورقة العلم من كلوروفيل (a), و معدل وزنها الطري و مساحتها، و عمرها الوظيفي.
No English abstract
References used
ARNON, D.I. 1949.Copper enzymes in isolated chloroplast . I .Polyphenol oxidase in Beta vulgaris . Plant Physiol.
EVANS, L. T. and DUNSTONE, R. L.,1970.Some physiological aspects of evolution in wheat. Austral. J. Biol. Sci.
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A half diallel set of crosses among six highly diverse barley (Hordeum
vulgare L.) genotypes were evaluated at Karahta station of field crops research
(GCSAR) Damascus Governorate, during 2010-2011 and 2011-2012 seasons to
study heterosis and comb
ining ability components for plant height, grain yield
per plant, number of spikes per plant, number of grains per spike and
thousand kernel weight.
This cultivation was carried out in the farm of the Faculty of Agriculture at Damascus University during the 2013-2014 agricultural season to study the effect of seeding rate per unit area and planting dates on yield and its components for three barley genotypes under rain-fed conditions.
The principle of causality is considered one of the most important philosophical and
scientific principles that played a seminal role in developing scientific and epistemic
research. This started with the commencement of philosophical thought. Sinc
e then the
early philosophers attempted to look for the first causes that formed the universe and the
real reasons that led to the phenomena and incidents happeningin it , Hence, the principle
of causality helped to present a general comprehensive viewpoint about the universe. This
viewpoint says that nature always undergoes fixed rules, phenomena becomes regular
according to a certain system and that the hierarchy of these phenomena is linked with
systems that have laws and certain causal liaisons .
With the advancement of science and knowledge, it has become clear to scientists
and thinkers that mind does not conclude laws save through a number of principles, one of
which is the principle of causality. Thus, scientific experiment shows that phenomena are
related to each other as the causesare related to the effects. This is explained through the
principle of causality by which it is possible to derive conclusions of the general laws that
rule the relationships between correlated phenomena , As a result of the causal theory,
many philosophical and scientific concepts that are strongly related to the principle of
causality emerged. Such concepts were that of necessity, inevitability and indeterminism
which in its turn led to the emergence of many philosophical doctrines and scientific
movements that contributed greatly to the scientific and epistemic sphere through the
theories and problematic questions they posed and probed.
A half diallel set of crosses among six highly diverse barley (Hordeum
vulgare L.) genotypes were evaluated at Karahta Research Station, General
Commission of Scientific Agricultural Research (GCSAR), during 2010-2011
and 2011-2012 seasons to stud
y heterosis, potence ratio, correlations among
traits and path coefficient analysis for number of spikes per plant, number of
grains per plant, number of grains per spike, biological yield ,and grain yield
per plant. Heterosis effects for seed yield ranged from%-89.52 (T-6669×S-6303)
to%16.99 (Arabi abiad mohsan×S-6689) and from%-49.94 (L-6711×S-6689)
to %-1. 35 (Arabi abiad mohsan×S-6689) relative to mid and better parents
respectively. Potence ratio values ranged from 1.14 (number of spikes per
plant) to 3.50 (biological weight) indicating that non-additive gene action was
more important in controlling all studied traits. Correlation coefficients among
traits indicated that seed yield was positively and significantly associated with
each of number of spikes per plant (0.289), number of grains per plant (0.832),
number of grains per spike (0.587), and biological yield (0.708) traits. Path
coefficient analysis indicated that number of grains per plant trait had high
positive direct effects on grain yield.
The research aimed to evaluate the genetic diversity and the genetic
relationship between 16 Hordeum vulgare genotypes (variaties and new lines),
using SSR markers. 32 primer pairs were used in the analysis, five of them
amplified primers monomorp
hic alleles, while the remaining primers detected
different alleles. A total of 126 polymorphic alleles were revealed by the 27
primer pairs. The number of different alleles detected on alocus ranged from 2
to 11with a mean of 4.66 alleles per locus. The polymorphic information content
(PIC) values ranged from 0.21 to 0.88 with a mean value of 0.49, and the gene
diversity ranged from 0.23 to 0.89 with a mean value of 0.53.The dendrogram
was established using SSR data clustered into three major groups. The smallest
genetic relationship was observed between line39 and line38 . The results proved
the efficiency of SSR markers in the estimation of genetic diversity and in the
clustering of the barley genotypes in Syria.
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