The Impact of Genotype and Salinity on Physiological Function, Secondary Metabolite Accumulation, and Antioxidative Responses in Lettuce

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• 作者：Hela Mahmoudi ; Jun Huang ; Margaret Y. Gruber ; Rym Kaddour ; Mokhtar Lachal ; Zeineb Ouerghi ; Abdelali Hannoufa
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2010
• 出版时间：April 28, 2010
• 年：2010
• 卷：58
• 期：8
• 页码：5122-5130
• 全文大小：805K
• 年卷期：v.58,no.8(April 28, 2010)
• ISSN：1520-5118

文摘

Salinity inhibits plant growth due to osmotic and ionic effects. However, little is known about the impact of genotype and salinity on biochemical and molecular processes in the leafy vegetable lettuce. We report here evaluations of two lettuce types, Verte (NaCl tolerant) and Romaine (NaCl sensitive), under iso-osmotic 100 mM NaCl and 77 mM Na₂SO₄ treatments. As compared to Romaine, NaCl-treated Verte displayed better growth, contained lower levels of inorganic cations in leaves, and possessed superior antioxidative capacity due to enhanced carotenoid and phenolics biosynthesis and more active antioxidative enzymes resulting in reduced membrane damage. Both genotypes had relatively similar growth patterns under Na₂SO₄ treatment, but Romaine showed enhanced root lignification, greater malondialdehyde formation, and suppressed Fe-superoxide dismutase expression in roots as compared with Verte.