Papers by Raziuddin Ansari
Phragmites karka (Retz.) Trin, ex. steud, a perennial reed with creeping rhizome from the family ... more Phragmites karka (Retz.) Trin, ex. steud, a perennial reed with creeping rhizome from the family Poaceae, is distributed as pure population in
brackish water swamps. Populations primarily propagate using ramets but also produce numerous seeds which form part of the seed bank after
dispersal and are exposed to extremes of temperature, drought, and salinity stress. Seeds were germinated under a range of salinity (0, 100, 200,
300, 400, 500 mM NaCl) and temperature (10/20 °C, 15/25 °C, 20/30 °C, 25/35 °C, night/day) regimes in 12 h light:12 h dark photoperiod or in
complete darkness with 0, 5, 10, 25 mM CaCl2. Salinity, absence of light and high temperature (25/35 °C) reduced germination while calcium
generally reversed this effect, more so at cooler temperature regimes. Calcareous soil around Karachi would help alleviate the salinity effect on the
germination of P. karka and facilitate its survival.
Books in Soils, Plants, and the Environment, 2010
Agriculture Ecosystems & Environment, 2009
South African Journal of Botany
Phragmites karka (Retz.) Trin, ex. steud, a perennial reed with creeping rhizome from the family ... more Phragmites karka (Retz.) Trin, ex. steud, a perennial reed with creeping rhizome from the family Poaceae, is distributed as pure population in brackish water swamps. Populations primarily propagate using ramets but also produce numerous seeds which form part of the seed bank after dispersal and are exposed to extremes of temperature, drought, and salinity stress. Seeds were germinated under a range of salinity (0, 100, 200, 300, 400, 500 mM NaCl) and temperature (10/20 °C, 15/25 °C, 20/30 °C, 25/35 °C, night/day) regimes in 12 h light:12 h dark photoperiod or in complete darkness with 0, 5, 10, 25 mM CaCl2. Salinity, absence of light and high temperature (25/35 °C) reduced germination while calcium generally reversed this effect, more so at cooler temperature regimes. Calcareous soil around Karachi would help alleviate the salinity effect on the germination of P. karka and facilitate its survival.► Phragmites karka seeds could germinate in high salinity. ► Seeds buried in the soil have poor germination. ► Optimal temperature required for good germination. ► Calcium improves germination under sub-optimal temperature, light and salinity treatments.
Pak. J. Bot, 2010
Effects of salinity on germination, growth, ion accumulation and water relations were studied in ... more Effects of salinity on germination, growth, ion accumulation and water relations were studied in a highly palatable and nutritious forage grass species-Kochia scoparia, under greenhouse conditions. It was highly tolerant to salinity (600-800 mM NaCl) at germination; the seedling growth remained unaffected up to 600 mM NaCl and the plants survived with reduced growth upto a high salinity of 1800 mM NaCl. Maintenance of leaf succulence seemed dominant factor in offsetting harmful effects of salinity.
Comptes Rendus Biologies, 2009
Ethylene is invariably produced during seed germination but its role in regulating seed dormancy ... more Ethylene is invariably produced during seed germination but its role in regulating seed dormancy and germination is poorly understood. Seeds of 22 halophytic species having different life forms -salt secreting dicots, salt secreting monocots, stem succulents and leaf succulents were germinated in Petri dishes kept in a growth chamber set at 20/30 • C (night/day) temperature and a 12 hr light period. Sodium chloride and ethephon were added to the medium from the beginning of the experiment. Seed germination was recorded every other day for twenty days. Application of ethylene did not have any significant effect on releasing seeds from innate dormancy. However, it appeared to have a role in alleviation of salinity effects which varied from negative in certain species to almost complete alleviation of high salinity effects in others.
Sind University Research Journal: …, 1972
Proceedings of the Second Meeting of the …, 1993
Biosaline agriculture and high salinity tolerance, 2008
Air is a mixture of gases and is normally colorless, odorless, and tasteless. Its major constitue... more Air is a mixture of gases and is normally colorless, odorless, and tasteless. Its major constituent gases are nitrogen (78%) and oxygen (21%), with the remaining 1% comprises, Ar, CO 2 , Ne, He, CH 4 , Kr, H 2 , CO, Xe, O 3 , oxides of S and N, and water vapors . It took about 4.5 billion years of evolution to produce this composition of air, which made this planet, a place capable of supporting life in its present form. Although Homo sapiens appeared late in the Earth's history, this species has been dominant in modifying its environment.
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Papers by Raziuddin Ansari
brackish water swamps. Populations primarily propagate using ramets but also produce numerous seeds which form part of the seed bank after
dispersal and are exposed to extremes of temperature, drought, and salinity stress. Seeds were germinated under a range of salinity (0, 100, 200,
300, 400, 500 mM NaCl) and temperature (10/20 °C, 15/25 °C, 20/30 °C, 25/35 °C, night/day) regimes in 12 h light:12 h dark photoperiod or in
complete darkness with 0, 5, 10, 25 mM CaCl2. Salinity, absence of light and high temperature (25/35 °C) reduced germination while calcium
generally reversed this effect, more so at cooler temperature regimes. Calcareous soil around Karachi would help alleviate the salinity effect on the
germination of P. karka and facilitate its survival.
brackish water swamps. Populations primarily propagate using ramets but also produce numerous seeds which form part of the seed bank after
dispersal and are exposed to extremes of temperature, drought, and salinity stress. Seeds were germinated under a range of salinity (0, 100, 200,
300, 400, 500 mM NaCl) and temperature (10/20 °C, 15/25 °C, 20/30 °C, 25/35 °C, night/day) regimes in 12 h light:12 h dark photoperiod or in
complete darkness with 0, 5, 10, 25 mM CaCl2. Salinity, absence of light and high temperature (25/35 °C) reduced germination while calcium
generally reversed this effect, more so at cooler temperature regimes. Calcareous soil around Karachi would help alleviate the salinity effect on the
germination of P. karka and facilitate its survival.