Centre d'Agrobiotechnologie et Bioingénierie, Unité de Recherche Labellisée CNRST (Centre AgroBiotech, URL-CNRST 05), Faculté des Sciences et Techniques, Université Cadi Ayyad, Marrakech 40000, Morocco.
Clermont Auvergne INP, CNRS, Institut Pascal, Université Clermont Auvergne, F-63000 Clermont-Ferrand, France.
Mar Drugs. 2023 May 16;21(5):301. doi: 10.3390/md21050301.
Alginates extracted from two Moroccan brown seaweeds and their derivatives were investigated for their ability to induce phenolic metabolism in the roots and leaves of tomato seedlings. Sodium alginates (ALSM and ALCM) were extracted from the brown seaweeds and , respectively. Low-molecular-weight alginates (OASM and OACM) were obtained after radical hydrolysis of the native alginates. Elicitation was carried out by foliar spraying 20 mL of aqueous solutions (1 g/L) on 45-day-old tomato seedlings. Elicitor capacities were evaluated by monitoring phenylalanine ammonia-lyase (PAL) activity, polyphenols, and lignin production in the roots and leaves after 0, 12, 24, 48, and 72 h of treatment. The molecular weights (M) of the different fractions were 202 kDa for ALSM, 76 kDa for ALCM, 19 kDa for OACM, and 3 kDa for OASM. FTIR analysis revealed that the structures of OACM and OASM did not change after oxidative degradation of the native alginates. These molecules showed their differential capacity to induce natural defenses in tomato seedlings by increasing PAL activity and through the accumulation of polyphenol and lignin content in the leaves and roots. The oxidative alginates (OASM and OACM) exhibited an effective induction of the key enzyme of phenolic metabolism (PAL) compared to the alginate polymers (ALSM and ALCM). These results suggest that low-molecular-weight alginates may be good candidates for stimulating the natural defenses of plants.
从两种摩洛哥褐藻中提取的藻酸盐及其衍生物被研究其诱导番茄幼苗根部和叶片中酚类代谢的能力。从褐藻 和 中分别提取了海藻酸钠(ALSM 和 ALCM)。通过自由基水解天然藻酸盐得到低分子量藻酸盐(OASM 和 OACM)。通过叶面喷雾 20 毫升(1 g/L)水溶液在 45 天大的番茄幼苗上进行诱导。通过监测处理后 0、12、24、48 和 72 小时根部和叶片中苯丙氨酸解氨酶(PAL)活性、多酚和木质素的产生来评估诱导剂的能力。不同级分的分子量(M)为 ALSM 为 202 kDa,ALCM 为 76 kDa,OACM 为 19 kDa,OASM 为 3 kDa。FTIR 分析表明,OACM 和 OASM 的结构在天然藻酸盐氧化降解后没有改变。这些分子通过增加 PAL 活性以及在叶片和根部积累多酚和木质素含量,表现出对番茄幼苗天然防御的差异诱导能力。与藻酸盐聚合物(ALSM 和 ALCM)相比,氧化藻酸盐(OASM 和 OACM)对酚类代谢关键酶(PAL)的诱导作用更为有效。这些结果表明,低分子量藻酸盐可能是刺激植物天然防御的良好候选物。