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Articles by Azra Yasmin
Total Records ( 3 ) for Azra Yasmin
  Azra Yasmin and Shahida Hasnain
  Bacterial strains (which could tolerate 2-3 M NaCI in the growth medium) were isolated from the roots of Erigerane linifolious. They were EI-1, EI-2, El-3 (from histoplane of roots) and REII-1, REI-2, REI-3, REI-4, REI-5 (from the rhizoplane). All bacterial strains were motile rods (except El-2 which were cocci), exhibiting either Gram-negative (El-1, El-2, El-3, REI-1) or Gram-variable (REI-2, REI-3, REI-4, REI-5) staining. These strains were affiliated with genus De/ya (EI-1), Vibrio (EI-3, REI-1), while four Gram-variable strains chaired characters with Bacillus pumilus. They have wide temperature and pH ranges with different optima. These strains also exhibit multiple salts/osmolytes/heavy metals/antibiotics resistance. Curing of plasmids from four of these strains revealed that salt tolerance and most of the other resistances were plasmid encoded. Plasmids residing in these halo-tolerant strains were conjugative (except pSH1413I. Hybridization experiments revealed that one of these plasmids (pSH1414) belonged to IncN group of plasmids.
  Shazia Afrasayab , Azra Yasmin and Shahida Hasnain
  Among six Hg-resistant isolates (SHg-7, SHg-8, SHg-9, SHg-10, SHg-11, SHg-12), SHg-8 and SHg-12 could tolerate 450 μg ml–1 of HgCl2 in L-agar medium, whereas rest of the strains could tolerate 500 μg ml–1 of HgCl2 in this medium were Gram-negative rods (SHg-7, SHg-8, SHg-9, SHg-10, SHg-11) and SHg-12 were Gram-positive rods. SHg-11 & SHg-12 were strictly aerobic, remaining were facultatively aerobic. On the basis of morphological and biochemical characterization isolates SHg-7, SHg-8, SHg-9, SHg-10 could be affiliated with family Vibrionaceae and SHg-11 shared characters with Pseudomonadaceae, while the affinities of SHg-12 remained uncertain. All of them had a single plasmid band except SHg-11, but these plasmids were non-conjugative. They had broad pH range (5-11) with pH optima either at 6 or 7. Their optimal growth temperature was 32°C (SHg-9, SHg-10, SHg-11) and 37°C (SHg-7, SHg-8, SHg-12). All of them were sensitive to Sm, Km and Tc, while they showed resistance against Ap and Cm. They could also tolerate other heavy metal salts.
  Khushi Muhammad , Azra Yasmin , Hazir Rehman , Muhammad Faisal and Shahida Hasnain
  Twenty-four bacterial strains were isolated from rhizosphere and histoplane of four different arid plants, Trianthema partulacastrum, Rumex dentatus, Chenopodium morale and Coronopus didymus. These bacteria were inoculated to seeds of Vigna radiata var NM-92 which were germinated and grown for 15 days. Majority of strains had inhibitory effect on seed germination (2.2 to 13.0%). The increase in seedling length ranged from 17 to 38% with different inoculations. Bacterial strains TP1, TP3, TP4, RTP4 and RRD1 were the most effective ones for the different growth parameters such as seed length and seed weight whereas the most adverse effects were recorded with the inoculation of TP17 strain. Maximum increase in protein and auxin content was observed with strains TP5 and RCM2, respectively. Peroxidase and acid phosphatase showed maximum activity with the inoculation of strain TP1.
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