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- W2034162528 abstract "Nucleolytic activities from two plants of Leguminosae family were determined in order to consider if the nucleases of plants which belong to the same family or to the same species responded in similar ways to stress conditions during growth. Growth parameters of both plants were examined in parallel. In detail, seedlings from two plants, alfalfa (Medicago sativa L. cv. Luzerne Euver) and lentil (Lens culinaris cv. Thessalia), showed significant differences in response to iso-osmotic solutions of NaCl (100 mmol · L−1 solution equivalent to conductivity 8.0 dS m−1) and mannitol (190 mmol · kg−1). Plant height and dry weight of mannitol/NaCl-treated seeds in both plants were lower in comparison to controls (water). Mannitol stress reduced height and dry weight in alfalfa seedlings more than did NaCl. By contrast, lentil seedling growth was inhibited more by NaCl stress than mannitol. In addition, DNase and RNase response to mannitol stress differed in each plant compared to the controls. Mannitol stress induced a sharp increase in DNase- and RNase-specific activity during the initial stages of alfalfa seedlings' growth, followed by a decrease during subsequent days; in lentil seedlings, these activities were inhibited throughout the entire growth period. NaCl stress inhibited the above activities in both plants. After native electrophoresis on gels polymerized in the presence of DNA/RNA, the overall band intensities confirmed the above quantitative results of alfalfa RNase and DNase activity. In addition, the active gel analysis revealed that the decrease of nucleolytic activities in mannitol-treated alfalfa seedlings was mainly due to the strong reduction of acid nucleases. This is the first report of different non-ionic osmotic response of type I plant nucleases during seedlings' growth. In vitro, the addition of up to 300 mmol/L mannitol did not affect acid and neutral nuclease activity in enzyme preparations extracted, purified, and separated from control and mannitol-treated alfalfa seedlings. Our results suggest that plant nucleases responded in a different way to osmotic stress and ionic stress conditions during seedlings' growth." @default.
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- W2034162528 date "2001-01-01" @default.
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- W2034162528 title "RNase and DNase activities in the alfalfa and lentil grown in iso-osmotic solutions of NaCl and mannitol" @default.
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- W2034162528 doi "https://doi.org/10.1078/0176-1617-00158" @default.
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