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The effects of different sowing depth on grain yield and some grain yield components in wheat (Triticum aestivum L.) cultivars under dryland conditions
M Yagmur, D Kaydan
African Journal of Biotechnology , 2009,
Abstract: and yield components for wheat cultivars during 2004-2006 at one site in Van Province in Eastern Turkey. Grain yield and yield components were found to positively correlate with coleoptile length, with marked declines observed in grain yield and yield components among varieties with shorter coleoptiles in deepest sowing. Wheat sown at 5 cm gave greater yields than wheat sown at 3, 7 and 9 cm by 19.9, 22.3 and 62.5%, respectively. The highest grain yield (2.98 T ha-1) was obtained with the Alparslan cultivar sown at a depth of 5 cm. Grain yield of all varieties tested was drastically reduced when sown at depths of 9 cm, with the exception of the local Tir and Alparslan varieties, both of which, when compared to the other varieties tested, had longer coleoptiles.
Line × Tester Mating Design Analysis for Grain Yield and Yield Related Traits in Bread Wheat (Triticum aestivum L.)  [PDF]
Zine El Abidine Fellahi,Abderrahmane Hannachi,Hamenna Bouzerzour,Ammar Boutekrabt
International Journal of Agronomy , 2013, DOI: 10.1155/2013/201851
Abstract: Nine bread wheat (Triticum aestivum L.) genotypes were crossed in a line × tester mating design. The 20 F1's and their parents were evaluated in a randomized complete block design with three replications at the Field Crop Institute-Agricultural Experimental Station of Setif (Algeria) during the 2011/2012 cropping season. The results indicated that sufficient genetic variability was observed for all characters studied. A899?× Rmada, A899?× Wifak, and A1135?× Wifak hybrids had greater grain yield mean than the parents. A901 line and the tester Wifak were good combiners for the number of grains per spike. MD is a good combiner for 1000-kernel weight and number of fertile tillers. HD1220 is a good general combiner to reduce plant height; Rmada is a good general combiner to shorten the duration of the vegetative growth period. A901?× Wifak is a best specific combiner to reduce plant height, to increase 1000-kernel weight and number of grains per spike. AA × MD is a best specific combiner to reduce duration of the vegetative period, plant height and to increase the number of kernels per spike. A899?× Wifak showed the highest heterosis for grain yield, accompanied with positive heterosis for the number of fertile tillers and spike length, and negative heterosis for 1000-kernel weight and the number of days to heading. , ? low ratios and low to intermediate estimates of h2ns supported the involvement of both additive and nonadditive gene effects. The preponderance of non-additive type of gene actions clearly indicated that selection of superior plants should be postponed to later generation. 1. Introduction Bread wheat (Triticum aestivum L.) is an important staple food in Algeria. This crop ranks third after durum wheat (Triticum durum Desf.) and barley (Hordeum vulgare L.), with a yearly cropped area of 0.8 million hectares, representing 24.2% of the 3.3 million hectares devoted to small grain cereals. Algeria imported 3.0 million tons of bread wheat in 2010/2011, to remedy the decline in the domestic production and to build stocks to meet the needs. Increasing wheat production can be achieved by application of improved agronomic technics, developing and adopting high yielding varieties. Major emphasis, in breeding program, is put on the development of improved varieties with superior qualitative and quantitative traits and resilience to abiotic stresses. In fact, genetic improvement in bread wheat, having better tolerance against terminal heat and water stress, has a good promise to improve grain yield average and total wheat production. However to breed high
Combining ability analysis for grain filling duration and yield traits in spring wheat (Triticum aestivum L. em. Thell.)
Kamaluddin,;Singh, Rishi M.;Prasad, Lal C.;Abdin, Malik Z.;Joshi, Arun K.;
Genetics and Molecular Biology , 2007, DOI: 10.1590/S1415-47572007000300018
Abstract: a diallel analysis of wheat (triticum aestivum l. em. thell) parents (n = 11) and their f1 (n = 55) and f2 (n = 55) offspring was carried out for the following four traits: grain filling duration (gfd), gfd for growing degree days (gdd), 1000 seed weight and seed yield per plant. analysis of variance for general combining ability (gca) and specific combining ability (sca) displayed significant f1 and f2 general and specific combining ability effects for the four traits studied. for all the traits the gca effects were relatively more important than the sca effects, indicating that additive genetic effects were predominant. crosses displaying high sca effects for grain filling duration, seed weight and yield were observed to be derived from parents having various types of gca effects (high x high, high x low, low x low and medium x low). the single seed descent method can be applied to exploit additive gene effects whereas dominance gene effects could be valuable in hybrid wheat breeding programs. among the parents, genotypes from the international maize and wheat improvement center (centro internacional de mejoramiento de maíz y trigo, cimmyt) as well as south asia were found to be superior general combiners for grain filling duration. likewise, crosses involving diverse parents from cimmyt and south asia showed significant sca effects for grain filling duration and other traits.
Estimation of Heterosis for Grain Yield and its Related Traits in Wheat (Triticum aestivum L.) under Leaf Rust Conditions  [PDF]
Fida Hussain,Muhammad Ashraf,Syed Sadaqat Mehdi,Malik Tanveer Ahmad
Journal of Biological Sciences , 2004,
Abstract: Eight bread wheat (Triticum aestivum L.) cultivars were crossed in a diallel fashion and evaluated for heterosis in F1 generation for grain yield and other economic traits under leaf rust conditions. Highly significant differences were found among genotypes for all the traits studied. Significant positive heterosis and heterobeltiosis was observed for grain yield per plant in almost all crosses. Estimates for positive significant heterosis over mid and better parents for plant height were 68 and 32% of total crosses where as 44 and 35 crosses gave significant positive increased tillers per plant over their mid and better parents, respectively. Positive and significant heterotic effects were measured as 11.61, 61.90, 30.67, 2.3, 51.89, 126.64, 111.71 and 45.91% from crosses SA42 x Nacozari, MH 97 x Crow, Parula x Chenab70, Crow x Nacozari, Crow x Chenab70, SA42 x Nacozari, MH97 x SA42 and Nacozari x Chenab for plant height, tillers per plant, grains per spike, spikelets per spike, grain weight, grain yield, biological yield per plant and harvest index, respectively.
Evaluation of Wheat (Triticum aestivum L.) Varieties for Their Potential Grain Yield under the Agro-ecological Conditions of D.I.Khan  [PDF]
Muddassir Zishan Akhtar,Muhammad Ayyaz Khan,Khalil Ahmad,Maraj Alam
Journal of Biological Sciences , 2001,
Abstract: Ten wheat (Triticum aestivum L.) varieties viz., Inqalab-91, Sulaiman-96, Bakhtawar-92, Punjab-96, Pirsabak-91, Daman-98, Sarsabz, Sughat, MH-97 and Dera-98 were compared for different agronomic traits Daman-98 produced maximum 1000-grain weight and minimum number of fertile tillers m -2. Inqalab-91 showed maximum germination counts m -2, grains per spike, grain yield and harvest index, while maximum number of fertile tillers m -2 were observed in Sughat. Inqalab-91 proved to be the best yielding variety for D.I. Khan among all tested varieties and Bakhtawar-92, Pirsabak-91, Sughat, MH-97 and Dera-98 can be grown successfully to obtain better grain yields than the remaining wheat varieties.
Determination on Genetic Variation for Morphological Traits and Yield Components of New Winter Wheat (Triticum aestivum L) Lines  [cached]
Sali Ali ALIU,Shukri FETAHU
Notulae Scientia Biologicae , 2010,
Abstract: he genetic studies were conducted on six new winter wheat (Triticum aestivum L.) line during three years investigations developed in agro ecological conditions of Kosovo. Data for various morphological and yield traits were taken and analyzed for spike length (SL), plant height (PH), total dry matter (TDM), spike Weight (SW), grain weight per spike (GWS), yield (Y) and harvest index (HI). Field design consisted in a randomized blocks design (RBD) with three replications. Results indicated that the line 01KS as the most competitive genotypes produced significantly higher for SL (9.58 cm), GWS (2.37 g per spike) and grain yield (10.66 t ha-1) while lower yield was recorded at the line 04KS (8.02 t ha-1). The lowest SL (8.4 cm) belonged to line 06KS which was ranked as the least competitive genotype. The significantly higher total dry matter (TDM) was recorded at the wheat line 02KS on value 4.88 g, while the lowest (4.44 g) belonged to 04KS which was ranked as the last genotype. There was a positive and significant harvest index (HI) on value from 50.5% to 39.1%.
The Effect of Different Sowing Dates on Growing Periods, Yield and Yield Components of Some Bread Wheat (Triticum aestivum L.) Cultivars Grown in the East-Mediterranean Region of Turkey  [PDF]
Tevrican Dokuyucu,Aydin Akkaya,Didem Yigitoglu
Journal of Agronomy , 2004,
Abstract: The aim of this research was to determine the effect of different sowing dates on growing period, yield and some yield components of three bread wheat (Triticum aestivum L.) cultivars grown Kahramanmaras, in the East-Mediterranean region of Turkey. Experiment was carried out in a split-plot on randomized complete block design with four replications, between the year 1997-1999. Seven planting dates were planned with the first on 9th October and the others followed at about 15 day intervals. Two cultivars (Seri-82, Dogankent-1 and Panda) were the main plots and 7 different sowing dates were the subplots. According to the results of two years, sowing dates had significant effect on vegetative period (VP), grain filling period (GFP), days to maturity (DM), head number m-2 (HN m-2), 1000-grain weight (1000-GW) and grain yield (GY). Grain yields obtained from the first five sowing dates were not significantly different. Consequently, the period from first week of November to middle of December could be concluded as optimum sowing period for maximum grain yield for the region.
Stability of yield components in wheat (Triticum aestivum L.)  [PDF]
Dimitrijevi? Miodrag,Kne?evi? Desimir,Petrovi? Sofija,Ze?evi? Veselinka
Genetika , 2011, DOI: 10.2298/gensr1101029d
Abstract: Variability and stability of yield components for the large number of divergent common wheat genotypes originated in different world breeding institutions were studied. Interaction genotype x environment has been evaluated, in different environmental conditions. The experiment was performed using randomized block design in three replications on the experimental field in different environmental conditions. A total number of 60 plants have been analyzed in the full maturity stage. The analyzed cultivars showed very significant differences in the average values of analyzed traits. The significant influence of cultivars, year and their interaction on expression of traits was found. The effects of each of analyzed traits on phenotypic variability were different. The most stable genotypes have been determined for analyzed yield component. On the base of stability and phenotypic variability the genotypes can be used as parents in wheat breeding programs.
Grain filling parameters and yield components in wheat  [PDF]
Brdar Milka,Kobiljski Borislav,Balali?-Kraljevi? Marija
Genetika , 2006, DOI: 10.2298/gensr0603175b
Abstract: Grain yield of wheat (Triticum aestivum L.) is influenced by number of grains per unit area and grain weight, which is result of grain filling duration and rate. The aim of the study was to investigate the relationships between grain filling parameters in 4 wheat genotypes of different earliness and yield components. Nonlinear regression estimated and observed parameters were analyzed. Rang of estimated parameters corresponds to rang of observed parameters. Stepwise MANOVA indicated that the final grain dry weight, rate and duration of grain filling were important parameters in differentiating among cultivars grain filling curves. The yield was positively correlated with number of grains/m2, grain weight and grain filling rate, and negatively correlated with grain filling duration. Correlation between grain weight and rate of grain filling was positive. Grain filling duration was negatively correlated with grain filling rate and number of grains/m2. The highest yield on three year average had medium late Mironovska 808, by the highest grain weight and grain filling rate and optimal number of grains/2 and grain filling duration.
Effect of Watering Regime on Yield and its Components of Triticum aestivum var. el-phateah L.  [PDF]
Saleh A. Khaled
American Journal of Plant Physiology , 2010,
Abstract: In this study, the effects of watering regime on yield, some metabolic products as well as its components of Triticum aestivum var. el-phateah in two successive seasons (2004/2005) were conducted. Moreover, the addition of Halax 2 bio-fertilizers concentration was also followed. In spite of decreasing in dry weight and water contents of wheat plant by increasing field capacity, the % of germination was significantly increased (75% field capacity). Upon increasing the water regime; also the photosynthetic efficiency, root elongation, chlorophyll b as well as protein contents were raised. The addition of bio-fertilizer to wheat plants under water regime significantly enhanced shoot elongation, chlorophyll a as well as photosynthetic assimilation.
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