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Articles by Noor-ul-Islam Khan
Total Records ( 4 ) for Noor-ul-Islam Khan
  Saghir Ahmad , Noor-ul-Islam Khan , Muhammad Zaffar Iqbal , Altaf Hussain and Mahmudul Hassan
  Salinity is a big threat to world agriculture. It imposes a major setback in increasing the yield of cotton. This crop is very sensitive to salinity at germination and seedling stage. Salt stress adversely affects the biomass production, i.e., decrease in leaf area, stem thickness, shoot and root weight and ultimately brings about decrease in seed cotton yield. A threshold salinity level at which initial yield of cotton declines is 7.7 dS m-1 with a 50% reduction in yield at 17.0 dS m-1. Reduction in fibre length, fibre strength and micronaire values, whereas an increase in ginning out-turn have been reported under saline conditions in both Gossypium hirsutum and Gossypium barbadense. High salinity level adverse affects photosynthesis. Research studies indicate decrease in nitrogen of leaf cotton with increasing salinity levels. Salinity increases Na+ and Cl¯ and decreases K+, Ca2+ and Mg2+ in leaves of cotton. Slight increase in K+ and modest accumulation of Na+ with increase in salinity have also been found in literature. K+/Na+ ratio has been used as a successful selection criterion for salt tolerance in some crops. Generally salt tolerance in cotton has been associated with Na+ exclusion. High salinity reduces N and P uptake in cotton, whereas low salinity does not have a significant effect on the absorption of either of the ions.
  Saghir Ahmad , Muhammad Zaffar Iqbal , Saeed Ahmad , Muhammad Attique Sadiq and Noor-ul-Islam Khan
  Inheritance pattern of sympodia per plant, plant height, bolls per plant, seed cotton yield and seed oil content of cotton was assessed using diallel crossing model in which six genotypes B-557, Culture 728-4, MNH156, B-1850 (ne), Culture-604-4 and MNH147 were crossed in all possible combinations. The results from scaling tests for the adequacy of additive-dominance model indicated that sympodia per plant, plant height, bolls per plant, seed cotton yield and seed oil content were partially adequate for further genetic analysis. Sympodia per plant, plant height, bolls per plant and seed cotton yield and were controlled by additive genes, whereas over-dominance was prevalent in seed oil content characteristics. Narrow sense heritability for plant height, bolls per plant and seed cotton yield suggested that these parameters could effectively be improved through selection in the early segregating generations.
  Saghir Ahmad , Noor-ul-Islam Khan , Muhammad Iqbal , Muhammad Attique Sadiq and Altaf Hussain
  Three salt tolerant cultivars/lines (B-557, Culture-728-4 and MNH-156) and three salt sensitive cultivars/lines (B-1580 (ne), Culture-604-4 and MNH-147) were grown in salinized soil under greenhouse conditions. Four treatments of NaCl, i.e., 16 (control), 70, 140, 210 mol m-3 were applied after 10 days of initial growth, and experiment continued till maturity. Determination of ions at seedling stage showed that the salt tolerant and the salt sensitive cultivars did not differ significantly in accumulation of leaf. The salt sensitive cultivars had more concentration of Cl- in leaves than those of the salt tolerant lines at the highest salt level. The salt tolerant cultivars had generally higher concentrations of K+, Ca2+ and K/Na ratios in the leaves than those of salt sensitive lines at the highest NaCl concentration (210 mol m-3). Ginning out-turn and fibre fineness increased with the increasing concentrations of salt, whereas staple length, fibre maturity and fibre strength showed decreasing trend at higher salt concentrations (140 and 210 mol m-3). The salt tolerant cultivars/lines had lower ginning out-turn, but better fibre fineness, higher staple length, fibre maturity and fibre strength compared with those of the salt sensitive cultivars. The salt tolerance in cotton is thus associated with higher uptake of K+, Ca2+, low accumulation of Cl-in the leaves and low ginning out-turn but higher staple length, fibre maturity and fibre strength.
  M. Iqbal , Rao Sohail Ahmed Khan Khezir Hayat and Noor-ul-Islam Khan
  The experiment was conducted to detect genetic variation and genetic effects associated with cultivars. Seven varieties of upland cotton (G. hirsutum L) representing a broad array were crossed in all possible combinations in diallel fashion, the parents and F1 progenies were sown in replicated experiment. Hayman diallel cross analysis was employed to investigate the nature of action and interaction of genes involved in the inheritance of character while the Griffing techniques was used to estimate general and specific combining ability of parents and genetic components of the variance for traits under study. Diallel analysis revealed that all the characters were polygenetically inherited and exhibited the greater part of genetic variation is due to dominant effect for all traits as (H1/D)1/2 value is more than one and the dominant gene effect H1, H2 is also significant for all traits under study. The H1 value is almost equal to H2 for all the traits, which indicate the occurrence of equal gene frequency at all loci. The ratio H1/4H1 is also nearly equal 0.25 for all traits except for node of first fruiting branch, seed cotton yield and staple length, which reflected that positive and negative alleles are equally distributed among the parents for all traits. Significant estimates for General Combining Ability (GCA) and Specific Combing Ability (SCA) effect is significant for all traits but GCA mean square were smaller than SCA indicating dominant gene action for the traits under study and it is possible that hybrid vigour for these traits can be utilized. From the GCA value, it is estimated that LRA-5166 is the best combination for NFB, boll number and monopodial branches while FH-945 is best combiner for plant height, number of nodes/plant, staple length. From SCA effect it is observed that cross FH-901 X MNH554, LRA5166 X FH-945 were good cross combination for selecting the genotypes having lower NFB and M.B values, in segregating generation while the cross combination LRA5166 X CIM499 has the reasonable SCA effect for seed cotton yield, GOT% which indicated that the progenies of this cross should be used for improving yield, yield components with early maturing traits like less monopodial branches and lower value of NFB. The estimate of heritability broadsense (Hbs) and narrow sense (Hns) indicated that the main portion of genetic variation among the population under study was due to dominant gene effect.
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