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Articles by Iftikhar Hussain Khalil
Total Records ( 3 ) for Iftikhar Hussain Khalil
  Muhammad Sayyar Khan , Muhammad Siraj Swati , Iftikhar Hussain Khalil and Amjad Iqbal
  An experiment consisting of nine hybrids and their ten parents (inbred lines) was conducted at Agricultural Research Institute, Tarnab, Peshawar, during August 2001, using Randomized complete block design with three replications. Data were recorded on yield and other important characters. Data were analyzed using M-StatC and the means were separated through least significant difference test. Significant genetic differences were observed among inbred lines for number of leaves per plant, plant height, head diameter, number of seeds per head, number of filled and unfilled seeds per head and percent oil content. Genetic differences among the hybrids were significant for all characters. TS-17 x TR-120 showed maximum heterosis for the number of leaves per plant, number of seeds per head and seed yield ha--1. TS-4 x TR-11 showed maximum heterosis for plant height, head diameter and percent oil content. Mean data for percent oil content was higher for TS-17 x TR-120, TS-18 x TR-120 and TS-4 x TR-11 than all other hybrids. Based on the mean performance and heterotic effects for important characters, these three hybrids are suggested for further study and use in the breeding programmes.
  Muhammad Sayyar Khan , Iftikhar Hussain Khalil and Muhammad Siraj Swati
  To study the effects of heterosis on important agronomic and yield contributing traits, this experiment was conducted at Agricultural Research Institute, Tarnab, Peshawar during August 2001, using Randomized complete block design with three replications. The planted material consisted of ten sunflower inbred lines (Parents) and their nine crosses. Highly significant genetic differences were observed among the inbred liens for head weight per plant, seed weight per head, 1000-seed weight and harvest index, however, the differences among the inbred lines for the weight of filled seeds per head were statistically non significant. Genetic differences among the hybrids were significant for all characters except for head weight per plant. High levels of heterosis were observed for the hybrids TS-17xTR-120 and TS-18xTR-120 for important agronomic characters such as head weight per plant (184 and 183%, respectively), seed weight per head (322.3 and 292.7%, respectively) and weight of filled seeds per head (302.7 and 295.5%, respectively). TS-4xTR-11 showed maximum heterosis for 1000-seed weight (104.6%) and harvest index (128.6%). Mean data for 1000-seed weight, weight of filled seeds per head and seed weight per head were higher for TS-17xTR-120, TS-18xTR-120 and TS-4xTR-11 than all other hybrids. Based on the mean performance and high heterotic effects for important characters, these hybrids and their parents are suggested for further study and use in sunflower breeding programs.
  S. Salim Shah , Hidayat-Ur-Rahman , Iftikhar Hussain Khalil and Muhammad Iqbal
  Leaf blight of maize (Zea mays L.), caused by Bipolaris maydis (Nisik. and Miyake), is one of the major factors limiting maize production in the plain areas of Pakistan, particularly in the North West Frontier Province (NWFP). The objectives of this study were to estimate selection differential, expected and observed response to selection and heritability for maydis leaf blight resistance and grain yield and to determine progress from selection in a maize population. Two cycles of S1 recurrent selection were conducted in broad based maize population, Sarhad White (SW). One hundred S1 lines were compared with their respective original population (C0) as a check. The experimental material was evaluated under artificial epiphytotics during 2003 and 2004, at NWFP Agricultural University, Peshawar. Selection differentials, expected responses and heritability estimates were determined from the replicated S1 lines performance of the first cycle. The observed progress was estimated from the replicated S1 lines of the second cycle that were generated after recombination of selected S1 lines of the first cycle. Highly significant variations between the cycles were observed for MLB and grain yield. Moderate and high heritability estimates, desirable selection differentials and close correspondence of expected and observed response were manifested for MLB and grain yield. The positive percent deviation of inoculated from uninoculated trials in both cycles (C1 = 71% and C2 = 41%) for leaf blight indicated successful development of blight disease after artificial inoculation, while the negative percent deviation of inoculated form uninoculated trials (C1 = -21 and C2 = -6%) for grain yield indicated the impact of blight disease on grain yield. Blight disease was significantly reduced from 2.9 to 2.3, whereas, grain yield was significantly increased from 2041 kg ha-1 cycle-1 to 2527 kg ha-1 cycle-1 or 19% cycle-1. This yield improvement in SW was probably the result of concomitant reduction in the blight disease severity by -26%. These findings suggested that S1 recurrent selection was quite effective in improving disease resistance and grain yield. Nevertheless, some additional cycles of selection may be required to further improving grain yield and resistance level to maydis leaf blight in SW maize population.
 
 
 
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