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Articles by Muhammad Aslam Chowdhry
Total Records ( 18 ) for Muhammad Aslam Chowdhry
  Ashi Ambreen , Muhammad Aslam Chowdhry , Ihsan Khaliq and Rashid Ahmad
  Mode of gene action was studied in a 5 x 5 diallel cross of bread wheat involving five genotypes namely 8073, 8177, 6039-4, Pb-96 and MH-97. Highly significant differences were observed for all the traits studied. Over-dominance was observed in hygrophilic colloids and stomata size. Flag leaf area, leaf venation and stomatal frequency were governed by partial dominance with additive gene action. Epidermal cell size was controlled by partial dominance. Non-allelic interactions were observed in flag leaf area and stomata size.
  Muhammad Arshad and Muhammad Aslam Chowdhry
  A diallel cross involving eight bread wheat genotypes were evaluated to determine the genetic behaviour of wheat genotypes across the environments. The experimental material was planted under irrigated as well as drought stress conditions. Data collected on yield and related traits revealed highly significant differences among genotypes under both sowing conditions. Graphical analysis revealed that additive action of genes for plant height and grains per spike under irrigated conditions changed to over dominance under drought. However, it was also found that gene action for flag leaf area, 1000-grains weight and grain yield per plant remained the same over environments. It was also observed that parental genotypes shifted their positions in the graphs from recessive to dominant or the midway or vice versa, showing different genetic constitution for the same trait in response to environmental change. Genotypes displaying similar constitution under both sowing conditions showed that they contain stable genes for those particular characters and may prove useful in future breeding strategies.
  M. Usman Khan , Muhammad Aslam Chowdhry , Ihsan Khaliq and Rashid Ahmad
  The experiment was conducted in greenhouse and field under moisture stress condition using twenty four spring wheat genotypes. Inter-relationship among different characters were estimated by simple correlation and path-coefficient analysis. Simple correlation indicated that survival rate, root/shoot ratio, root density, number of veins, flag leaf area, plant height, number of tillers per plant and 1000-grain weight showed positive and significant association with grain yield. Whereas, path-coefficient analysis revealed that 1000-grain weight, root density and stomatal frequency, are the characters which exerted maximum direct positive effect on yield, respectively.
  Abdul Sattar , Muhammad Aslam Chowdhry and Muhammad Kashif
  Broad-sense heritability and genetic advance value were computed for flag leaf area, flag leaf weight, specific flag leaf area, specific flag leaf weight, plant height, tillers per plant, spike length, spikelets per spike, grains per spike, 1000-grains weight and grain yield per plant involving six bread wheat crosses viz., WLRG-6 x 5039, WLRG-7 x 5039, WLRG-6 x LU26S, WLRG-1 x LU26S and WLRG-1 x 5039. Most of these traits showed moderate to high estimates of heritability with appreciable genetic advance values. Crosses WLRG-7 x LU26S, WLRG-1 x 5039 and WLRG-7 x 5039 are of considerable interest showing high heritability estimates for all the characters studied.
  Muhammad Kashif , Javed Ahmad , Muhammad Aslam Chowdhry and Khalida Perveen
  Gene action and components of variance analysis were made in a 6X6 diallel cross in durum wheat (Triticum durum Desf.). Additive gene effects were more important for all the traits. Complete dominance for yield plant-1 and spike length and over dominance for tillers plant-1 was observed. While plant height, spikelets spike-1, grains spike-1 and 1000-grain weight exhibited partial dominance. Dominant alleles were more frequent in parents for all characters except plant height and 1000-grain weight. Durum wheat genotypes, Altar 84 and Bittern “s” showed relatively higher combining ability.
  Razia Riaz and Muhammad Aslam Chowdhry
  Six wheat genotypes were evaluated following a 6x6 diallel. cross to determine the heritability and variation for some physio-morphic traits under drought condition. Parental genotypes and their hybrids differed significantly for all the characters studied including leaf venation, stomatal frequency, stomata size, epidermal cell size, flag leaf area, grains per spike, 1000-kernel weight and grain yield per plant. High estimates of both broad and narrow sense heritability estimates indicated that leaf venation, stomata size, epidermal cell size, grains per spike, 1000-grain weight and grain yield per plant were highly heritable in the breeding material used in this study. A fairly high amount of genetic variation for these traits was transmitted to the offsprings and almost whole of that variation was additive in nature. Thus, single plant selection for these traits can be practiced during early generations of offsprings with high efficiency.
  Razia Riaz and Muhammad Aslam Chowdhry
  Six wheat genotypes viz., 90-R-34, 96-R-37, Rawal 87, Rohtas 90, Chakwal 86 and Kohsar 95 were crossed in a 6x6 full diallel fashion during the crop season 1997-98 to determine the genetic architecture of some economic traits of wheat under drought condition. Genotypes differed significantly among each other for all the six traits studied. It was revealed that flag leaf area was conditioned by over-dominance type of gene action. Plant height, tillers per plant, grains per spike, 1000-grain weight and grain yield per plant were under the control of additive gene action. The genotype 90-R-34 was indicated as the best parental genotype. In case of hybrids, all the crosses of 90-R-34 with Rohtas 90 were the best hybrids showing useful characteristics viz., higher grains per spike, 1000-kernel weight and eventually high grain yield per plant. The study on the whole indicated the presence and importance of both additive and -non-additive genetic effects for the inheritance of the studied characters in the six wheat genotypes and their hybrids grown under drought condition. It would be helpful to use recurrent and pedigree selection procedures to select for well adapted drought tolerant genotypes in the subsequent generations of the crosses involving 90-R-34, 96-R-37 and Rawal 87.
  Muhammad Sajjad Saeed , Muhammad Aslam Chowdhry and Muhammad Ahsan
  Mean squares for General Combining Ability (GCA) were highly significant for number of spikelets per spike while non-significant for spike density, number of grains per spike, 1000-grain weight and grain yield per plant. Specific combining ability mean squares were highly significant for spike density, number of grains per spike; 1000-grain weight and grain yield per plant. While significant for number of spikelets per spike. Mean squares for reciprocal effects were highly significant for number of spikelets per spike and number of grains per spike while non-significant for spike density and 1000-grain weight. Additive gene effects controlled the expression of the traits like number of spikelets per spike and number of grains per spike as is evident by greater mean squares for general combining ability. However the gene action was non-additive for spike density, number of grains per spike, 1000-grain weight and grain yield per plant as indicated by the greater mean squares of SCA variances than GCA ones. It is therefore suggested from the results that number of spikelets per spike and number of grains per spike can be transferred from the parents to the progeny with additive effects, which are ultimately responsible for increased grain yield.
  Muhammad Aslam Chowdhry , Ghulam Rabbani , Ghulam Mahboob Subhani and Ihsan Khaliq
  Combining ability of some polygenic traits was studied in a set of diallel cross involving five varieties/lines of bread wheat. Mean squares for general combining ability were highly significant for plant height; extrusion length, grains per spike, 1000-grain weight and grain yield per plant and non-significant for flag leaf area, tillers per plant and spikelets per spike. Mean squares for specific combining ability were highly significant for plant height, flag leaf area, tillers per plant, extrusion length, grains per spike, 1000-grain weight and grain yield per plant and non-significant for spikelets per spike. Mean squares for reciprocal effects were also highly significant for plant height, tillers per plant, extrusion length, grains per spike, 1000-grain weight and grain yield per plant, significant for spikelets per spike. The magnitude of variance (s) was higher than variance (g) for all the traits except spikelets per spike. Hence non-additive gene effects were important in the inheritance of all traits except spikelets per spike. The parent genotypes, 7028 and Rohtas 90 and hybrids Parwaz 94 x Pitic 62, Rohtas 90 x Pitic 62 had high GCA and SCA effects, respectively and they could be exploited for further selection of high yielding progenies.
  Naeem Mahmood and Muhammad Aslam Chowdhry
  A full diallel cross involving six bread wheat genotypes was evaluated for the inheritance of some growth parameters. Mean values displayed significant reduction of 17.50, 20.60, 17.67, 15.54, 15.25 and 28.04 per cent for days to heading, plant height, fertile tillers, days to maturity, grain filling period (GFP) and grain yield per plant under late planting, respectively, as compared to normal planting. Genetic analysis revealed that additive gene action for days to heading and maturity and grain filling period under normal planting changed to dominant under late planting, while overdominant gene action for plant height changed to additive and additive gene action for fertile tillers per plant and grain yield per plant remained unchanged. Dominant genes were responsible for early heading, fertile tillers per plant and GFP under both plantings while dominant gene control for plant height and days to maturity under normal planting changed to recessive under late planting. Similarly, gene control for grain yield per plant changed from recessive to dominant under late planting.
  Muhammad Asif , Ihsan Khaliq , Muhammad Aslam Chowdhry and Abdus Salam
  Five wheat varieties/lines viz; HABA-4, HABA-12, Pitic-62, Pak-81 and LU26S were crossed in a diallel fashion to determine the mode of inheritance of some important spike characteristics. Number of spikes per plant, number of grains per spike and grain yield per plant were governed by over dominance type of gene action. Number of spikelets per spike, spike length and 1000-grain weight were ruled by partial dominance with additive type of gene action except spike length in which non additive type of gene action was observed. Epistasis was absent for all the traits studied.
  Ghulam Mahboob Subhani and Muhammad Aslam Chowdhry
  A 6 x 6 diallel cross involving six bread wheat varieties i.e., Pak.81, LU26S, Inqlab 91, Rohtas 90, 4072 and 4943 was analysed to draw a Vr/Wr graph. Partial dominance alongwith additive type of gene action were exhibited for stomatal frequency, specific flag leaf weight, days to heading, plant height, spike length and 1000-grain weight under both environments. Over dominance was observed for leaf venation under irrigated as well as drought stress conditions. Whereas over dominance type of gene action changed into partial dominance or vice versa with the change of environment for flag leaf area, tillers per plant, grains per spike, biomass per plant and grain yield per plant. Genotype 4943 possessed maximum dominant genes for grain yield per plant, biomass per plant, grains per spike and tillers per plant under irrigated conditions and LU26S for 1000-grain weight, days to heading and flag leaf area. In case of drought stress conditions variety Inqlab 91 had maximum dominant genes for grain yield per plant, biomass per plant, grains per spike and plant height while genotype 4943 for 1000-grain weight, tillers per plant, days to heading and stomatal frequency. Dominant genes involved in the inheritance of leaf venation, flag leaf area, specific flag leaf weight, plant height, spike length, grains per spike, 1000-grain weight, biomass per plant and grain yield per plant and recessive genes accounted for the increase of days to heading and tillers per plant under both environments.
  Ihsan Khaliq and Muhammad Aslam Chowdhry
  An 8 x 8 diallel cross experiment involving eight varieties/lines was planted in a randomized complete block design to ascertain the nature of genetic mechanism controlling different morphological traits under two different soil fertility regimes. Highly significant genotypic difference for all the characters were obtained under both recommended as well as half dose of fertilizer plantings. All varieties/ lines, as expected under a half dose of fertilizer planting, exhibited a reduction in the development of morphological and yield related characters. Plant height, under recommended dose of fertilizer planting, 1000-grain weight and grain yield under a half dose of fertilizer planting were controlled by partial dominance type of gene action. Whereas, over-dominance was exhibited by number of tillers per plant, grains per spike, and grain yield per plant under recommended dose of fertilizer. The positive coefficient of correlation of Wr+Vr with parental means indicated positive effects of recessive genes for the expression of number of tillers per plant under recommended dose of fertilizer.
  Mohsin Ali Chaudhry , Muhammad Aslam Chowdhry , Muhammad Ahsan and Ihsan Khaliq
  A 5 x 5 diallel cross experiment on spring wheat varieties namely Shahkar-95, Chakwal-86, Faisalabad-85, Rawal-87 and Pasban-90 was conducted to ascertain the type of gene action involved in the control and expression of some important morpho-physiological traits. Plant height, flag leaf area, leaf venation and epidermal cell size were controlled by additive type of gene action with partial dominance. While the parameters like stomatal frequency and stomata size were controlled by over dominance type of gene action. Epistasis was absent in all the traits
  Muhammad Aslam Chowdhry , Mohsin Ali Chaudhry , Syed Mansur Mohsin Gilani and Muhammad Ahsan
  Five wheat varieties/lines viz., Shahkar-95, Chakwal-86, Fsd-85, Rawal-87 and Pasban-90 were crossed in a diallel fashion to determine the genetic mechanism controlling yield and its components. Spike length, number of spikelet per spike, 1000-grain weight and grain yield per plant were governed by over dominance type of gene action. Number of tillers per plant and number of grains per spike were controlled by additive type of gene action with partial dominance. Epistasis was absent for all the traits studied
  Javed Ahmad and Muhammad Aslam Chowdhry
  A significant effect of the plant development stage on fertility was observed at the time of colchicine treatment. Plants at the 5-7 tillers stage showed improved plant fertility and reduced plant mortality than those treated at the 2-3 tillers stage. The addition of colchicine to media resulted not only in higher plant fertility than did conventional methods, but furthermore led to a huge increase in the number of doubled-haploid seeds.
  Javed Ahmad and Muhammad Aslam Chowdhry
  The results of crosses between the best pollen sources and various female wheat parents of different ploidy levels (hexaploid and tetraploid) indicated that hexaploid wheat perform better than tetraploid in crosses with maize. However, successful production of embryos at a relatively high frequency could be achieved in tetraploid wheats with FSH-399. The highest frequency of embryo formation (59.0%) was produced from a cross between the hexaploid wheat (F1 Cross-5) and maize hybrid FSH-399.
  Ghulam Mahboob Subhani , Muhammad Aslam Chowdhry and Syed Mansur Mohsin Gilani
  Thirty-six genotypes of bread wheat (Triticum aestivum L.) were evaluated for genetic variability parameters and regression analysis under irrigated and drought stress conditions. Tillers per plant, peduncle length, 1000-grain weight, grain weight of mother shoot, biomass per plant and grain yield per plant exhibited high genotypic coefficient of variability under both environments. Grain yield per plant suffered a maximum reduction of 68 percent followed by 58.9, 57.4, 42.7, 41.5 and 27.4 percent, for biomass per plant, flag leaf area, tillers per plant, grain weight of mother shoot and plant height under drought stress conditions compared to irrigated conditions, respectively. High heritability estimates 90.08, 85.01, 83.32, 76.01, 74.86 and 72.23 percent were found for 1000-grain weight, days to heading, peduncle length, spike length, plant height and spikelets per spike, respectively under irrigated conditions. High values of heritability were shown for days to heading, 1000-grain weight and spike length under drought stress conditions. Regression analysis indicated the importance of biomass per plant, harvest index and tillers per plant in influencing grain yield per plant in bread wheat. The plant height is more important than grain weight of mother shoot in case of drought stress conditions for the contribution of grain yield per plant.
 
 
 
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