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Articles by Muhammad Akbar ANJUM
Total Records ( 4 ) for Muhammad Akbar ANJUM
  Muhammad Azhar Bashir , Hamid Rashid and Muhammad Akbar Anjum
  Nodal segments, 1.5-3.0 cm long with 1 or 2 nodes taken from in vitro shoot cultures of six jojoba strains, were cultured on MS medium supplemented with 2.5 or 5.0 mg L-1 BA or 2.5 mg L-1 BA + 2.5 mg L-1 of one of NAA, IAA or IBA. Different growth parameters regarding shoot multiplication were recorded. BA at the rate of 2.5 mg L-1 caused the earliest sprouting of buds and produced the longest primary shoot, maximum number of nodes per primary shoot. However, BA at the rate of 5.0 mg L-1 produced the maximum number of shoots per explant. While the combination consisting of 2.5 mg L-1 BA + 2.5 mg L-1 IBA delayed the bud sprouting and produced the minimum number of shoots, the shortest primary shoot and the minimum number of nodes per primary shoot. Among the strains PKJ-3 led the other strains in performance, while PKJ-2 trailed in all parameters. The number of shoots and the length of primary shoot were significantly affected by the interactions between strains and growth regulators combinations.
  Muhammad Azhar Bashir , Muhammad Akbar Anjum and Hamid Rashid
  The study was conducted to initiate roots from in vitro derived shoots of six promising strains of jojoba i.e., PKJ-1 to PKJ-6. MS medium was supplemented with three auxins i.e., IBA, IAA and NAA each at the rate of 1.25, 2.5 and 5.0 mg L-1 in the one experiment and at the rate of 0.5, 1.0 and 1.5 mg L-1 in the other experiment. Different growth parameters pertaining to root formation were recorded. In the 1st experiment, the lowest concentration (1.25 mg L-1) of each auxin gave satisfactory results, the other two higher concentrations of auxins (2.5 and 5.0 mg L-1) caused callus induction. Efficacy of auxins was improved in the 2nd experiment as each auxin and its concentrations affected significantly the root characteristics of each strain. IBA and 0.5 mg L-1 were the most effective auxin and concentration, respectively. Among the strains, PKJ-3 performed the best of all, as it took the minimum time to root, produced maximum number of roots and attained longer primary root and higher percentage of rooted shoots in both experiments.
  Muhammad Amjad , Muhammad Akbar Anjum and Habib Ullah Malik
  N (0, 25, 50 or 75 kg ha–1) and P2O5 (0, 15, 30 or 46 kg ha–1) were applied in different combinations to onion cultivars Dark Red, Early Red and Faisal Red. All the P and half of the N were applied at the time of sowing while the rest of N was applied as a top dressing at flowering. Number of flowers per umbel significantly varied among the cultivars and was highest in Faisal Red (667), while the cultivars did not differ significantly in time taken to flowering, number of flower stalks per plant, diameter of umbel and seed yield. Fertilizer doses had significant effect on diameter of umbel, number of flowers pe umbel and seed yield, while time taken to flowering and number of flower stalks per plant have no significant response to these particular doses of fertilizer, Interaction between cultivars and fertilizers doses was only significant for number of flower stalks per plant. Maximum number of flower stalks were produced in cv. Faisal Red at a fertilizer dose of 75 kgN+45 kg P20, ha–1.
  Muhammad Akbar ANJUM
  The aim of this study was to assess the effects of spermidine (Spd) on ameliorating adverse effects of salinity in Troyer citrange seedlings. For this purpose, 6-month-old, uniform-sized seedlings of Troyer citrange were transplanted to plastic containers containing Hoagland nutrient solution. Addition of 75 mM NaCl into the nutrient solution reduced the plant growth, leaf chlorophyll content, chlorophyll fluorescence yield (Fv/Fm), net photosynthetic rate, respiration rate, and total Spd, N, and Ca2+ + Mg2+ contents of the leaves. It increased the leaf proline, total putrescine (Put), total spermine (Spm), Na+, and Cl- contents of the leaves. Addition of Spd (0.1 or 0.5 mM) to the saline nutrient solution and its weekly sprays (1 or 5 mM) on NaCl-stressed plants improved leaf number, chlorophyll content, Fv/Fm, net photosynthetic rate, and N content; increased total Spd and Spm contents; and reduced Na+ contents of the plants. Leaf Ca2+ + Mg2+ contents were slightly improved only when Spd (0.5 mM) was added to the saline nutrient solution. Leaf P and K+ contents were not significantly affected by the salinity or Spd treatments. Among the polyamines, Put content was least affected, while there was a sharp increase in Spm content due to the salinity and Spd treatments. These results suggest involvement of Spm in the salinity tolerance of citrus rootstock Troyer citrange.
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