Unhealthy Lifestyle Among Malaysian
Pak. J. Bot., 37(1): 131-139, 2005.
SALINITY EFFECTS ON SEEDLING GROWTH AND YIELD COMPONENTS OF DIFFERENT INBRED RICE LINES
AISHA SHEREEN, S. MUMTAZ, S. RAZA, M.A. KHAN AND S. SOLANGI Nuclear Institute of Agriculture, Tandojam, Pakistan.
Abstract Water culture studies of short (seedling stage) and long term (maturity) stage were conducted to evaluate the effect of different levels of salinity (0, 50, 75 mM NaCl) on the growth, yield and yield components of different inbred rice lines. Studies at seedling stage showed significant growth reduction in term of leaf mortality and shoot fresh weight in all tested lines under salinity. However, the rate of reduction varied among different lines. Variable responses to salinity have been observed at vegetative and reproductive stages. The lines which have shown tolerance at seedling stage exhibited greater reduction in their grain production. All yield contributing characters like fertility, tiller numbers, panicle number and panicle length were significantly reduced under salinity. Among these contributing characters sterility was found to be major cause of yield losses under saline conditions.
Introduction Salinity is a major factor reducing plant growth and productivity throughout the world. Approximately 10% of the world’s 7 x 109 ha. arable land surface consist of saline or sodic soils. The percentage of cultivated land affected by salts is even greater. Of the 1.5 x 109 ha. Cultivated lands, 23% are considered saline and another 37% are sodic and it has been estimated that one-half of all irrigated lands (2.5 x 108 ha.) are seriously affected by salinity and water logging (Francois & Maas, 1999). This problem is more serious in the agriculture of south and southeast Asia, which accounts for more than 90% of world rice production are worstly affected by salinity (320 mha) (Aslam et al., 1993). Rice is rated as a salt sensitive crop (Maas & Hoffman, 1977; Shannon et al., 1998). Although, salinity affects all
SALINITY EFFECTS ON SEEDLING GROWTH AND YIELD COMPONENTS OF DIFFERENT INBRED RICE LINES
AISHA SHEREEN, S. MUMTAZ, S. RAZA, M.A. KHAN AND S. SOLANGI Nuclear Institute of Agriculture, Tandojam, Pakistan.
Abstract Water culture studies of short (seedling stage) and long term (maturity) stage were conducted to evaluate the effect of different levels of salinity (0, 50, 75 mM NaCl) on the growth, yield and yield components of different inbred rice lines. Studies at seedling stage showed significant growth reduction in term of leaf mortality and shoot fresh weight in all tested lines under salinity. However, the rate of reduction varied among different lines. Variable responses to salinity have been observed at vegetative and reproductive stages. The lines which have shown tolerance at seedling stage exhibited greater reduction in their grain production. All yield contributing characters like fertility, tiller numbers, panicle number and panicle length were significantly reduced under salinity. Among these contributing characters sterility was found to be major cause of yield losses under saline conditions.
Introduction Salinity is a major factor reducing plant growth and productivity throughout the world. Approximately 10% of the world’s 7 x 109 ha. arable land surface consist of saline or sodic soils. The percentage of cultivated land affected by salts is even greater. Of the 1.5 x 109 ha. Cultivated lands, 23% are considered saline and another 37% are sodic and it has been estimated that one-half of all irrigated lands (2.5 x 108 ha.) are seriously affected by salinity and water logging (Francois & Maas, 1999). This problem is more serious in the agriculture of south and southeast Asia, which accounts for more than 90% of world rice production are worstly affected by salinity (320 mha) (Aslam et al., 1993). Rice is rated as a salt sensitive crop (Maas & Hoffman, 1977; Shannon et al., 1998). Although, salinity affects all
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