http://localhost:80/xmlui/handle/123456789/14060 2026-04-23T15:33:19Z http://localhost:80/xmlui/handle/123456789/15407 Title: SHORT TERM EXPOSURE OF UV-B RADIATION ENHANCES SALINITY TOLERANCE IN VIGNA RADIATA Authors: NEELOFER HAMID; HINA HUSSAIN; FAIZA JAWAID; AFSHAN RAHMAN Abstract: Electromagnetic radiation (7%) emitted from the sun is in the UV range (200–400) nm. Several morphological and anatomical changes have been reported from plants grown under long-term UV-B regimes. The effect of UV-B radiation (280-320nm) and salinity alone and in combination were studied. Fifteen days old seedlings of Vigna radiata were exposed to UV-B radiation for 10, 20 and 30 minutes and salinity treatment was given to the plants 3 days before the UV-B treatment. UV radiation was artificially provided by Esco Airstream Vertical Laminar Flow Cabinet (AVC-4AI). Significant decrease (p<0.05) in root and shoot length, specific leaf area, chlorophyll and carotenoid content of in all UV-B and salinity treatments was observed as compared to control. The reduction was more pronounced in salinity treatment as compared to UV-B alone and combination of UV-B with salinity. It is concluded that the short term exposure of UV-B radiation enhances the salinity tolerance in Vigna radiata 2012-04-20T00:00:00Z http://localhost:80/xmlui/handle/123456789/15406 Title: OCCURRENCE OF THE GENUS LOBOPHORA (DICTYOPHYCEAE, PHAEOPHYCOTA) IN THE COASTAL WATERS OF KARACHI Authors: K. AISHA; MUSTAFA SHAMEEL Abstract: Fan-shaped, flabellate and rosette like fronds of a brown alga Lobophora J. Agardh were collected from various coastal areas of Karachi (Pakistan) and taxonomically investigated. This study revealed the presence of two species i.e. L. variegata (Lamouroux) Womersley ex Oliveira and a new species L. prostrata Aisha et Shameel. The black brown coloured specimens of the new species were found prostratly attached with the rocks by their lower surface. They contained a central layer of large rectangular cells in cortical region, peripheral part in the upper surface having small squarish cells but lower surface without any peripheral cells. In lower part of the thallus, each cell produced rhizoidal filaments, which were globular and contained rectangular cells 2012-04-20T00:00:00Z http://localhost:80/xmlui/handle/123456789/15405 Title: INFLUENCE OF STORAGE TEMPERATURE ON FUNGAL PREVALENCE AND QUALITY OF CITRUS FRUIT (CV. BLOOD RED) Authors: ABDUR RAB; MUHAMMAD SAJID; KHAN, NAQIB ULLAH; NAWAB, KHALID; MUHAMMAD ARIF; KHATTAK, MANSOOR KHAN Abstract: The influence of storage temperature on post storage fungal prevalence and quality of citrus fruit (sweet orange cv. Blood Red) was investigated at the Horticultural Laboratory of Khyber Pakhtunkhwa Agricultural University, Peshawar. The fruits were exposed to 5, 10 and 20 °C for 45 days and then kept at ambient temperature for 25 days. The fruits were evaluated for disease incidence and other quality attributes at 5 days incubation to the maximum of 25 days. Results indicated that disease incidence and prevalence of Penecillium itallicum and Penecillium digitatum were higher in fruits stored at 5 and 20°C and were lower at 10°C. Weight loss was higher in the fruits stored at 20°C followed by 5°C and was lower at 10°C Ascorbic acid was higher in fruits stored at 10°C followed by 5 and was lower at 20°C. Disease incidence and prevalence of Penecillium itallicum and Penecillium digitatum and weight loss increased while ascorbic acid decreased with increase in post storage incubation from 0 to 25 days. It is concluded that storage of citrus fruits at 10°C performed better in terms of fight against disease and fungal prevalence and perseverance of quality. 2012-04-20T00:00:00Z http://localhost:80/xmlui/handle/123456789/15404 Title: INOCULUM SOURCES, DISEASE INCIDENCE AND SEVERITY OF BACTERIAL BLACKLEG AND SOFT ROT OF POTATO Authors: ALI, HAFIZ FARHAD; MUSHARAF AHMAD; MUHAMMAD JUNAID; AYESHA BIBI; ASAD ALI; MUHAMMAD SHARIF; BARKAT ALI; KHALID NAWAB; AMNA SADOZA Abstract: Comprehensive surveys during spring, summer and fall, 2007-2009 were conducted in the major potato-growing areas of KPK to record the incidence, severity and distribution of blackleg and soft rot of potato caused by the different subspecies of Erwinia. Maximum disease severity (40%) and disease incidence (60-75%) was found in the spring and summer potato crop grown in Abbottabad, Swat and Mardan, Pakistan. The frequencies of Erwinia carotovora subsp. atroseptica (Eca), E. c. subsp. carotovora (Ecc) and Erwinia chrysanthemi (Ech), based upon the survey of 42 locations, were found to be 48%, 45%, and 7%, respectively. Regarding soil, diseased plant debris and seed potatoes as sources of inoculum for Eca, healthy plant material, potted un-sterilized soil and healthy seed potatoes were inoculated with Eca, kept in screen-house and monitored for changes in bacterial population over a period of three months. It was found that seed potatoes were the most important source of primary inoculum as the bacterial population considerably increased in numbers throughout the monitoring period. The bacterial population in the inoculated plant debris did decrease but the rate of decline was quite slow and therefore, diseased plant debris could be considered as a good source of primary inoculum for the appearance of black leg disease in the next season 2012-04-20T00:00:00Z