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Articles by Ihsan Khaliq
Total Records ( 5 ) for Ihsan Khaliq
  Muhammad Kashif and Ihsan Khaliq
  A 5 x 5 diallel cross of spring wheat (Triticum aestivum L.) was conducted to estimate the gene action for some polygenic traits like plant height, flag leaf area, fertile tillers per plant, spike length, spikelets per spike, grains per spike, 1000-grain weight and grain yield per plant. Additive type of gene action with partial dominance was observed for flag leaf area, fertile tillers per plant, spike length, spikelets per spike and grains per spike, suggesting early selection for fairly good improvement in these traits. While over dominance for plant height, 1000-grain weight and grain yield per plant indicated fruitful selection in the later segregating generations. Epistasis was absent for all the traits studied.
  Muhammad Aslam Chowdhry , Mohsin Ali , Ghulam Mahboob Subhani and Ihsan Khaliq
  Correlation and path-coefficient were computed on 10 bread wheat genotypes for plant height, flag leaf area, grains per spike, 100-grain weight, total dry matter of above ground material, total water used, evapo-transpiration efficiency, harvest index, water use efficiency and grain yield per plant. Highly significant differences were observed among the varieties/advanced lines for all the traits except water use efficiency, which was only significant. Grain yield was positively and significantly correlated with total dry matter, evapo-transpiration efficiency, harvest index and water use efficiency but non-significantly with plant height, flag leaf area, grains per spike, 100-grain weight and total water used. Maximum and positive direct effect (1.2956) was produced by water use efficiency and followed by total dry matter (1.286). While minimum negative direct effect was produced by 100-grain weight (-0.7902). Plant height, flag leaf area, 100-grain weight, total water used, evapo-transpiration efficiency and water use efficiency produced maximum positive indirect effects of 0.5313, 0.3390, 0.6495, 0.6985, 0.7382 and 0.4079 on grain yield through total dry matter, respectively. The traits having positive direct effects on grain yield, considered to be a suitable selection criteria for evolving high yielding genotypes. While in case of negative direct effects on grain yield, indirect selection criteria could be practiced through traits with positive indirect effects.
  Muhammad Ahsan , Syed Sadaqat Mehdi and Ihsan Khaliq
  The development of pure lines of maize by the application of tissue culture is considered to be more effective to enhance high yielding hybrids development. Somaclonal variations may be more useful for genetic material exchange in wide hybrids. Disease-free superior clones can be regenerated through tissue culture techniques, which can be applied to all known infectious agents but are especially valuable in elimination viruses and viroids from vegetatively propagated crops. Producing clean planting material through in vitro methods can significantly raise crop yield and quality. A synthetic medium is more useful than the natural products in the medium for the callus induction and growth. As the process of regeneration may be enhanced by adding synthetic plant hormones (auxins and cytokinines) which regulate cell division and differentiation.
  M.Aslam Chowdhry , Muhammad Iqbal , Ghulam Mahboob Subhani and Ihsan Khaliq
  Analysis of variance showed that the genotypic differences for these characters were highly significant. The phenomenon of heterosis and heterobeltiosis occurred in varying degrees in almost all crosses for the characters under study. Additive type of gene action and additive with the involvement of over-dominance type of gene action were present in almost all the traits. Inbreeding depression was exhibited to varying degree in almost all the crosses for yield and yield components.
  Muhammad Kashif and Ihsan Khaliq
  Combining ability of some polygenic traits was studied in a set of 5 x 5 diallel cross involving five varieties of bread wheat viz., Inqalab 91, Uqab 2000, Punjab 96, MH. 97 and Fsd. 85. Mean squares for GCA effects were highly significant for fertile tillers per plant, spike length, spikelets per spike and grains per spike, significant for plant height and flag leaf area and non-significant for 1000-grain weight and grain yield per plant. Mean squares for SCA effects were highly significant for all the traits except fertile tillers per plant which was non-significant while reciprocal effects were non-significant for all the traits except spike length and grain yield per plant which were highly significant. The magnitude of GCA variance was higher than SCA variance for flag leaf area, fertile tillers per plant, spike length, spikelets per spike and grains per spike suggesting additive genetic control of these traits. Whereas, plant height, 1000-grain weight and grain yield per plant indicated the preponderance of non-additive genetic effects with higher magnitude of SCA variance. The varieties Uqab 2000 and Fsd. 85 were the best general combiners for most of the traits and could be used in further breeding programmes. Cross combinations Inqalab 91 x Fsd. 85, Uqab 2000 x MH. 97, Punjab 96 x MH. 97 and Uqab 2000 x Fsd. 85 with high SCA effects could be exploited for further selection of high yielding progenies.
 
 
 
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