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Register a new userHeterosis Study of Some Quantity Characters of Squash Cucurbita pepo, L
دراسة قوة الهجين لبعض الصفات الكمية في قرع الكوسا .L pepo Cucurbita
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Damascus University ورقة بحثية
Publication date
2011
fields
Groves
and research's language is
العربية
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نفذت هذه الدراسة في محطة بحوث الطيبة التابعة للهيئة العامة للبحوث العلميـة الزراعيـة خـلال موسميين زراعيين 2007 و 2008 باستخدام تسع سلالات من قرع الكوسا المهجنة بنظام التهجين نصف التبادلي 9×9 للحصول على ستة و ثلاثين هجيناً فردياً، لدراسة شملت صفات الساق، و صفات الباكوريـة، و مكونات الإنتاجية، بهدف تقدير قوة الهجين، قياساً إلى متوسط الأبوين، الأب الأعلى و الهجين القياسـي بهدف تحديد أفضل الهجن تفوقاً لاستثمارها في مجال الإنتاج الزراعي و الاستفادة منها في برامج تطـوير إنتاجية محصول قرع الكوسا. ظهرت قوة الهجين قياساً إلى متوسط الأبـوين واضـحةً فـي المكونـات الإنتاجية كلّها، و قد بلغت (89.16%) لنسبة الأزهار المؤنثة (57.57%) لعدد الثمار على النبات عند الهجين (IL3XIL6) ، فيما بلغت قيم قوة الهجين مقارنةً بالأب الأعلى (-71.13%) لصفة عدد العقد حتى أول زهرة مؤنثة عند الهجين(IL3XIL8) ، و (06.13%) لصفة نسبة الأزهار المؤنثة عند الهجـين (IL3XIL5) ، و (47.59%) لعدد الثمار على النبات عند الهجين (IL3XIL6) ، في حين أشارت قـيم قوة الهجين القياسية إلى تمتع أربعة هجن بقيم موجبة ذات دلالة إحصائية عالية بلغـت أعلاهـا لـصفة إنتاجية النبات (38.32%) عند الهجين (IL6XIL7) تلاه الهجين (IL3XIL6) بمعدل ( 68.28 % ).
This study was conducted at Research Altyba station where belongs GCSAR during 2007-2008. by using nine parental lines and their 36 F1 hybrids, were obtained from 9x9 half diallel design. The study included stem, earliness and yield component characters, in order to estimate of hetrerosis compare to the mid parents, the better parent and to the standard hybrid, and determine the superior hybrids advantage to invest in agricultural production and benefit from as well as in breeding program development yield of squash. Heterosis over mid parent was evident in all yield components, The hybrid (IL3XIL6) exhibited (16.89 ، 57.57%) respectively for the ratio pistilate flower % and fruit number per plant, negative heterobeltiosis (-13.71%) was recorded by the hybrid (IL3XIL8)for the number of nodes to first flower, While the hybrid (IL3XIL5) showed maximum positive and significant heterobeltiosis (13.06 %) for ratio pistilate flower%, and the hybrid (IL3XIL6) for fruit number per plant (59.47 %) Whereas the results showed that, four hybrids had positive and high significant standard heterosis for plant yield, the hybrid (IL6xIL7) and (IL3XIL6) had maximum value (32.38, 28.68% ) respectively
References used
Ahmed, E. A.; Iban Oaf, H. S. and El Jak, A. E. (2003). Combining abilities and heterosis in Line x Tester crosses of summer squash (Cucurbita pepo L.). Cucurbit Genetics Cooperative Report 26:54-56
Arnel, R. H. and Miranda, J. B. (1981). Quantitative genetics in maize breeding. Iowa State University press, Ames.468p
Bassett, J. M. (1986). Breeding vegetable crops, AVI Publishing company, INC, westport, Connecticut. U.S.A. pp: 214-219
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In this research, nine inbreed lines of squash (Cucurbita pepo, L) have been
studied during 2007-2008 seasons. The study contains plant phonological
phases, and the most important morphological and productivity characteristics
related to fruit yie
ld to evaluate the characteristics of every line and identify the
economical lines to use it in the breeding programs. The study showed genetic
variation between the groups for some important economic characteristics as
(the number of fruits per plant, percentage of female flowers, yield per plant,
stem long and number of nodes till the first female flower). The study also
showed that the inbreed lines of squash is a rich source of variation and can be
use in a breeding program to product squash hybrid. The results appeared also
the positive correlation between the productivity and some important economic
characteristics, such as percentage of female flowers (r=0.871**), the number of
fruits per plant (r=0.976**). Whereas negative correlation with the nodes till he
first female flower (r=- 0.494) and internodes long (r=- 0.447). Using cluster
analysis, the inbreed lines were classified into 2 distinct classes A and B, Class
A contained seven inbreed wreathe class B contained Tow inbreed lines.
This study was conducted at the vegetable field of department of
horticulture and landscape design, college of agriculture and forestry ,Mosul
university, during spring of 2007 and 2008, to study the effect of times and
levels of nitrogen fertiliz
ation on some characters vegetative growth, flowering
,and yield of summer squash .Result indicated that, the time of nitrogen
fertilization at the stage of fruit-set caused a significant increased in the leaf
number /plant ,length of the plant and the fresh weight/plant. While the time of
nitrogen fertilization wasn't affected significantly the total yield. The level at
320 kg.N/ha caused a significant increase of the characters vegetative growth
and total yield. Also result revealed that, the interaction between the stage at
fruit set and nitrogen fertilization at 320 kg.N/ha led to increase the total yield
.The yield was found to positively correlation with the plant length ,fresh and
dry weights of plant, leaf area, fruit weight, male and female flowers, and the
sex ratio.
This study was carried out through the cooperation between the Faculty of
Agriculture Tishreen University and the General Commission of Agricultural Scientific
Researches in Hama during 2013 and 2014 successive seasons.
Eight soft wheat(Triticumae
stivum)genotypes were crossed using half diallel method
.The(28) crosses were grown along with their parents in randomized complete block with
three replications to estimate general combiningability , specific combining ability, and
both mid and high parent heterosis for number of spikes /plant , number of grains /spike ,
thousand grain weight and grain yield.
The results indicated that both additive and non- additive types of gene action were
important in the inheritance of traits under study with preponderance of additive gene
effects for number of grains /spike and thousand grain weight,Non – additive gene effects
were pronounced in the inheritance of number of spikes /plant and grain yield.
High general combiners for thesecharacters were obtained and the most important
parents were: Bohouth 4- Douma 44828-Acsad1115- Golan2.
Many positive specific combiners having both mid and high parent heterosis and
derived from positive general combiners were obtained such as(Golan2×Cham10) –
(Acsad1115×Douma4)(Douma44828×Golan2) and (Douma 2×Golan2).
Results also indicated that some hybrids: (Douma44828×Golan2) (Bohouth6×Douma4)
(Douma44828×Cham10) (Douma2×Acsad1115) had heterosis compared to higher parent
for number of spikes /plant , number of grains / spike , Thousand grain weight and grain
yield..
Six population seeds of three yellow maize hybrids were formed at Agricultural Research Center, Homs, during 2008 and 2009 growing seasons. Their plants were evaluated in 2010. The present work aims to determine the genetic parameters in six populati
ons (P1, P2, F1, F2, BC1, and BC2). Mean square results showed significant differences among mean values for all traits in all crosses. Significant heterosis values were positive and relative comparing to mid and better parent for most traits. The potence ratios exceeded (+1) in all traits and crosses except ear height, indicating thus over-dominance. In breeding, depression values were significant in most traits for Cross-1, while their values were non- significant in all traits for Cross-2 except plant height, and also in Cross-3 except plant height and grain yield per plant. In most traits epestasis or dominance gene action occupied the first rank in the genetic effects in order of importance to cross, with the exception of number of rows per ear, number of kernels per row and grain yield per plant where additive gene action occupied the first rank for Cross-2 and Cross-1 respectively. Therefore, it could be suggested that selection for most studied traits in the subsequent generations will be relatively more effective than in the early generations.
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.
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