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Articles by Najma Ayub
Total Records ( 10 ) for Najma Ayub
  M. S. Gorsi , Rizwan Shahzad and Najma Ayub
  The Mycorrhizal status of plants growing in the rock crevices of valley Samahni, Azad Kashmir are described for the first time. For this purpose five different stands were selected from different areas of the valley. Mostly angiospermic trees, shrubs and herbaceous species including grasses, i.e., Themeda anathera, Heteropogon controtus and Eriophorum cosmosum were found growing in these rock crevices. Forty-three plant species belonging to 26 different families in these 5 stands were reported for VAM infection during the period March - September 1999. A comparative study of the five stands for VAM status revealed great variations in infection percentages of the same plant species in different stands. In certain cases arbuscules while in others vesicles were absent. In some plants both vesicles and arbuscules were found to be lacking. Soils were generally loamy to sandy loamy type with pH varying from 7.4 to 7.8, organic matter 0.42 to 1.00%, phosphorous 4.36 to 12.5 ppm. Cultivated crops can be important factor in increasing productivity under adverse conditions.
  Irshad Ahmad Khan , Shahbaz Ahmad and Najma Ayub
  A pot experiment was conducted with sterilized soil to study the effect of P2O5 and mycorrhizal fungus on growth of Avena sativa. Single inoculation with Gigaspora rosea had no significant effect on plant growth over the corresponding controls while with dual inoculation the increase was significantly higher, both in the presence or absence of phosphorus. The maximum shoot dry weight with dual inoculation (Glomus etunicatum + Glomus intraradices) was 38.45 g at 0 kg P2O5 ha-1 and 45.22 g at 25 kg P2O ha-1, while root dry weight was 19.13 g at 0 kg P2O5 ha-1 and 22.50 g at 25 kg P2O5 ha-1.
  Irshad Ahmad Khan , Shahbaz Ahmad and Najma Ayub
  Inoculation effect of single and dual vesicular arbuscular mycorrhizal (VAM) with Gigaspora rosea, Glomus intraradices + Gigaspora and Glomus etunicatum + Glomus intraradices on the growth and nutrients uptake (NPK) on Avena sativa were carried out. Yield in the response of shoot and root dry weight was significantly increased due to dual inoculation than single inoculations. The dry weight of dual inoculation in shoot was 33.68 and 38.45 g and in root was 16.84 and 19.13 g, respectively while the nitrogen, phosphorus and potassium uptake (%) was also more due to dual inoculations.
  Syed Riaz Ali Gardezi and Najma Ayub
  Eight species of mushrooms of family Russulaceae are described for the first time from Azad Jammu and Kashmir. These were Russula aeruginea, R. chamaeleontina, R. baghensa sp. nov., R. hullera sp. nov., R. lepida, R. nauseosa, R. kashmira sp. nov. and R. vesca. One species Russula emetica was redescribed from Kashmir. R. baghensas sp. nov., R. hullera sp. nov., R. kashmira sp. nov., are new to science. Different macro- and micro characters were taken into consideration for their proper identification and biochemical analysis of few species was also performed.
  Syed Riaz Ali Gardezi and Najma Ayub
  Five species of mushrooms of family Tricholomataceae, Russulaceae, Cortinariaceae and Agaricaceae were described for the first time form Azad Jammu and Kashmir. These were Pleurotus porrigens, Hypsizygus tessulatus, Lactarius acris, Pholiota caperata and Agaricus subrufescens. Two species of mushroom Pleurotus ostreatus and Agaricus silvicola were redescribed from Kashmir. Different macro- and microcharacters are taken into consideration for their proper identification and biochemical analysis of few species was also performed.
  Toqeer Ahmed , Rashida Kanwal and Najma Ayub
  The various strains of lactic acid producing bacteria such as S. cremoris and L. lactis and L. acidophilus isolated from the camel milk, were examined for their optimum growth temperatures, generation time, pH and acidity. All these strains grew rapidly at their respective optimum temperatures; however their generation time and pH varied. L. acidophilus strains showed greater generation time varied from 123.01 to 135.08/min and showed 0.85-0.96% acidity and 4.40-4.81 pH values, respectively while for L. lactis and S. cremoris generation time varied from 60.17 to 87.16/min and 64.9-80.0/min, respectively. S. cremoris and L. lactis produced 0.51-0.55% and 0.56-0.58% acidity and showed 4.7-4.79 and 4.80-4.89 pH values at their respective optimum temperatures. The optimum growth temperature for L. lactis and L. acidophilus was found to be 37 to 40°C while for S. cremoris was 37°C. There was inverse relationship between acidity, pH and generation time. It was observed that there was a correlation between the acidity, pH and generation time and there was also an inverse relationship between total titratable acidity and pH values of each strain.
  Jamshaid Gul , Audil Rashid and Najma Ayub
  Medicinally important wild plants (17) of Margalla hills Islamabad and Salt range of Pothowar were compared based on their vesicular arbuscular mycorrhizal (VAM) status. Statistical interpretation of the data indicated a significant difference between the results of vesicles, arbuscules and hyphal infection in plants of Margalla hills and Salt range area. The number of VAM spores recovered from the rhizospheric soils of both the areas was also significantly different. Soils analyses further revealed a significant difference for values of sand, silt, phosphorus, potassium, calcium carbonate and soil pH while clay and nitrogen contents were non-significant. The study concludes that wild plant have enormous ability to establish mycorrhizal association under stressed conditions particularly in the saline environment of Salt range, VAM root colonization emphatically reflects an adaptive mechanism of plants.
  Javed Iqbal Mirza , Shazia Hameed , Iftikhar Ahmad , Najma Ayub and R.H.C. Strang
  Four neem (Azadirchta indica A. Juss) products namely crude neem seed oil, nimbokil, crude neem seed oil terpenoid extract and neem leaf decoction were tested for their in vitro activity against mycelial growth, sporangial germination and sporangial production of Phytophthora infestans. All the products were found highly effective against the different life stages of the fungus. The compounds were evaluated both with and without being heat sterilized along the medium. The heat sterilized compounds were comparatively less effective as compared to the ones which were used without heat sterilization. The results show that neem products have potential for the management of potato late blight disease.
  Maliha Rashid , Samina Khalil , Najma Ayub , Sadia Alam and Farooq Latif
  After screening a large number of phosphate solubilizing microorganisms (PSM) isolated from rice rhizosphere on the basis of solubilization index (SI) and pH drop ten best bacterial strains (10RB, 54RB, 57RB, 20RB, 21RB, 23RB, 22RB, 13RB, 20RB, 40RB) and three best fungal strains {(Aspergillus flavus(1RF), Penicillium canescens(4RF), A. niger (8RF)}were further analyzed for their acid production ability using HPLC technique. SI of 13 best isolates ranged from 2.16-6.23. SI and change of pH of these isolates showed abrupt changes during seven days of incubation in Pikovskayas agar and broth medium respectively. This drop of pH clearly indicated the production of organic acids. HPLC results confirmed that few PSM isolates produced gluconic, fumaric, succinic, acetic and some unknown organic acids in smaller concentrations while oxalic and citric acids in larger concentrations in their broth medium. Among bacterial strains 10RB produced largest amount of organic acids (2.4747 g-l) while among fungal isolates Aspergillus flavus produced greatest amount of acids (1.835 g-l) than the other two fungal strain. The concentration of glucose when analyzed during HPLC was found less in all the cultural samples as compared to the control (13 g-l) that was without any PSM culture. This shows that all the PSM strains utilized the carbon of glucose for the production of organic acids. The abilities of these efficient strains for phosphorus (P) solubilization and immobilization were also quantitatively investigated in Pikovskayas broth medium. The results showed that all the strains solubilized (0.04-0.1%) and immobilized (0.1-0.4%) P but fungi immobilized more P than bacteria. Correlation among all the parameters showed a positive(r = 0.2, P<0.1) correlation between the organic acid excretion and P solubilization and a negative correlation was found between pH and P solubilization (r =-0.4, P<0.1) and immobilization (r=-0.5, P<0.05).
  Azhar Hussain , Sh. Muhammad Iqbal , Najma Ayub and Abdul Majeed Haqqani
  In vitro studies were conducted on the effect of temperature, pH levels, culture media, carbon and nitrogen sources on mycelial growth of Sclerotium rolfsii Sacc. Growth of S. rolfsii was maximum at 250C after 7 days of inoculation, which was reduced significantly below 200C and above 350C. All the tested pH levels (5 to 8) were found equally suitable for growth of fungus. This fungus grew best on cornmeal agar medium among the culture media that were tried. All the carbon sources were found to be the best while peptone was the best among the nitrogen sources.
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