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Articles by Ihsan Khaliq
Total Records ( 10 ) for Ihsan Khaliq
  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.
  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.
  Jahanzeb Farooq and Ihsan Khaliq
  Heterosis over mid and better parents was estimated in twenty crosses of bread wheat involving three varieties viz., PBW 222, LU26S and Uqab 2000 and two lines viz., 8952 and 8961. 1000-grain weight showed maximum heterosis over the mid parent (20.96%) followed by number of grains per spike (13.97%), plant height (-7.00%), grain yield per plant (-23.70%) and number of tillers per plant (-31.22%). The maximum heterobeltiosis was recorded for 1000-grain weight (12.58%), plant height (-18.51%), grains per spike (-20.71%), grain yield per plant (-25.39%) and tillers per plant (-33.16%).
  Muhammad Aslam Chowdhry , Muhammad Sajjad Saeed , Ihsan Khaliq and Muhammad Ahsan
  The experiment was conducted to evaluate and select strains/varieties of wheat in terms of their genetic values and also to make selection criteria for further breeding program. Mean squares for general combining ability were highly significant for flag leaf area, number of fertile tillers per plant and significant for spike length while non-significant for plant height and peduncle length. Specific combining ability mean squares were highly significant for plant height, number of fertile tillers per plant and peduncle length, while non-significant for flag leaf area and spike length. Mean squares for reciprocal effects were non-significant for all the traits under study. Additive gene effects controlled the expression of the traits like flag leaf area, number of fertile tillers per plant and spike length as is evident by greater mean squares for general combining ability while non-additive type of gene action indicated the pre-dominant role for plant height and peduncle length. However it is concluded from the results that flag leaf area, number of fertile tillers per plant and spike length might be used as selection criteria for further breeding program.
  Muhammad Aslam Chowdhry , Ashi Ambreen and Ihsan Khaliq
  Five wheat genotypes viz., 8073, 8177, 6039-4, Pb-96 and MH-97 were crossed in a diallel fashion to ascertain the genetic control of some polygenic traits. The analysis of variance revealed that the differences among genotypes for all the traits studied, were highly significant. The parameters like number of tillers per plant, plant height, number of grains per spike, 1000-grain weight and grain yield per plant were controlled by over-dominance type of gene action. Spike length was governed by partial dominance with additive gene action. Number of spikelets per spike was under control of partial dominance. Epistasis was present in plant height, spike length and 1000-grain weight.
  Ihsan Khaliq , Manzar Abbas and M. Asghar Rahim
  Correlation between production traits were obtained for 20 wheat varieties/lines. Path coefficient analysis were used to determine the direct and indirect effect of different characters on grain yield. A positive and significant genotypic correlation was observed between number of tillers per meter length, spike length, 1000-grain weight and grain yield but highly significant at phenotypic level. A positive and significant genotypic correlation was observed between peduncle length and grain yield but non significant at phenotypic level. Whereas plant height was negatively and non significantly correlated with grain yield per meter length. Path analysis showed that 1000-grain weight and spike length are the characters which contribute largely to 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.
  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.
  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
 
 
 
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