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Articles by Sadia Alam
Total Records ( 2 ) for Sadia Alam
  Sadia Alam , Asghar Ali , I.A. Qamar , M. Arshad and Salim Sheikh
  The present project was aimed to determine the correlation coefficients among different economically important traits using three varieties of Sorghum bicolor, and to ascertain the best combinations of characters to provide an ease to the breeders for improving those characters to improve biomass and yield. The sorghum varieties were PARC SS-1, PARC SS-2, and Pothwar 3-9 as control. The experiment was planted in July, 1998 at National Agricultural Research Centre (NARC), Islamabad in Randomized Complete Block Design (RCBD) with 3 replications. The plant observations were recorded from five earmarked plants in each plot and replication. The characters for observations were plant height, panicle length, 100-seed weight, number of grains/plant, days to 50% flowering, days to maturity, grain yield, stover yield and total dry matter (TDM). All traits were positively highly significantly (P<0.01) correlated with one another and yield. These findings indicate great scope for improvement in sorghum yield by improving the traits of 100-seed weight, panicle length, plant height and days to 50% flowering which are important yield components.
  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).
 
 
 
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