KMID : 0368420070500040447
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Journal of Plant Biology 2007 Volume.50 No. 4 p.447 ~ p.454
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Germination kinetics and seed reserve mobilization in two flax (Linum usitatissimum L.) cultivars under moderate salt stress
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Sebei Khaled
Debez Ahmed Herchi Wahid Boukhchina Sadok Kallel Habib
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Abstract
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Because of its high contents of protein, ¥á-linolenic-rich oil, lignans, and fiber, demand is increasing for flax(Linum usitatissi-mum L.) and flax seed oil as a food source. In this comparative survey, we examined germination and the mobilization of seed storage products (lipids and soluble proteins) of 3-d-old seedlings from two flax cultivars (N 51 and H 52) challenged with moderate salinity (up to 200 mM NaCl). At the highest salt concentration, germination appeared to be cultivar-dependent, with that of ¡®N 51¡¯ being less impaired and delayed than in ¡¯H 52¡¯. Sodium chloride inhibited germination via osmotic and toxic effects, so that seed viability was altered, especially in ¡®H 52¡¯. At 200 mM NaCl, lipid mobilization was delayed in the earliest germination phases. This response was associated with increased proportions of linolenic acid contents in both cultivars and more linolenic acid-rich molecular species of TAGs. Irrespective of the salt level, soluble protein contents in both cultivars decreased over time, although a salt-related precocity of protein degradation occurred at 200 mM NaCl.
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KEYWORD
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flax, germination, lipids, proteins, salinity
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