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Articles by Rehana Asghar
Total Records ( 4 ) for Rehana Asghar
  Mehwish Jamil Noor , Mushtaq Ahmad , Rehana Asghar , Aulia Kanwal and Sadaf Pervaiz
  The present study is confined to the palynological studies (pollen morphology and pollen fertility) estimation of some cultivated plant species of University of Arid Agriculture Rawalpindi campus. Pollen morphology of the selected species indicate that the pollen of these species varies in shape i.e, spherical, elliptical and oblong. The pollen fertility ranged from 60-100% among these species. In Bougainvellia glabra, Brassica campestris, Consolida ambigua, Tecoma stans, Crysanthemum indicum, Tagetis patela, Tradescantia indica, Hibiscus rosa-sinensis the range of pollen fertility is 98-100% whereas Catharanthus roseus, Canna indica, Calendula officinalis, Hibiscus circus, Jatropha integrrima, Jasminum grandiflora, Rosa indica and Rosa alba the range of fertility is below 98%. Pollen fertility studies have been modified helpful for the recognition of wide range of variation existing within plant species and differentiating plant species with genera.
  Ghulam Murtaza , Syed Abdul Majid and Rehana Asghar
  The Japanese climbing fern Lygodium japonicum (Thunb) Swartz was collected from Aalra Muzaffarabad, Azad Kashmir. The leaflets venation pattern was dichotomous and open. Anatomy of the rachis shows a central protostele with exarch to mesarch xylem surrounded by phloem. The protostele is surrounded by endodermis and pericyle. The phloem is protruded into the bays formed by a three angled protoxylem of protostele. The sporangia were globular shaped and have size 600-650 μm wide and 500-550 μm height. The number of spores per sporangium calculated was 256. Spores have 64-80 μm equatorial diameter, isospores, anisomorphic, contour subtriangular, trilete, exine 3-4 μm thick. Distal surface of the spores was warty at equatorial lines.
  Rehana Asghar , Muhammad Nisar Khan and Siraj Ahmed Kakar
  The structural and biochemical study of apple bark splitting (ABS) disorder was conducted in Balochistan. Anatomical results revealed that the cells of the phloem were crushed and large lysigenous air cavities were formed. The cells of the vascular cambium were also crushed there was no contact between the cells of the vascular cambium and functional phloem or young xylem cells. The air cavities were present throughout the bark extended until cambial layers. The exude which was oozed out of the bark was phloem sap and rich in sugar and also contained little amount of proteins. The chemical analysis of the exude had high contents of Na, K, Mg, Fe, Ni and Co in ABS infected trees as compared to the healthy trees. However, the Cu content was same in both trees and Zn content was higher in exudates of the healthy tree as compared to ABS infected trees.
  Nasira Altaf , Shahid Akhtar Khan , Mushtaq Ahmad , Rehana Asghar , R. Ashfaq Ahmed , Shabnum Shaheen , M. Zafar and M. Saqib
  Seed of 10 sesame (Sesamum indicum L.) cultivar supplied by National Agriculture Research Center, Islamabad were tested for seed borne mycoflora by standard blotter paper test. 11 phytopathogenic fungi viz., Alternaria brassicola, A. redicina, Aspergillus alba, A. flavus, A. niger, A. viridus, Cephalosporium sp., Curvularia sp., Drechslera sp., Fusarium sp. and Penicilliu, sp. were found associated with these samples. Percentage of seed sample infection and extent of fungal infection ranged from 0.75-53%. The effect of associated fungi on germination capacity was evaluated by the standard rolled paper towel method. The associated fungi decreased the germination potential. 11 fungi were isolated from abnormal seedling and ungerminated seeds.
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