Ghahari Sajjad, Nematzadeh Ghorban Ali, Pakdin Ali, Ardakani Mohammad Roayaei
Department of Biology, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
Genetics and Agricultural Biotechnology Institute of Tabarestan (GABIT), Sari Agricultural Sciences and Natural Resources University, Sari, Iran.
Curr Microbiol. 2025 Mar 31;82(5):220. doi: 10.1007/s00284-025-04208-y.
A new generation of farming inputs is being developed, designed to be more environmentally friendly and have fewer negative impacts on consumer health. Bio-based antimicrobial compounds are one such example. These compounds are used against pathogens and stimulate plant immune systems, reducing disease severity. This study evaluated suspensions and hydro-alcoholic extracts of 55 cyanobacteria from the Nostocales order for their antimicrobial effects and growth-promoting activity on tomato plants. Suspensions and extracts of 0.5 and 1 mg mL of two cyanobacteria, Nostoc sp. G-4D and Calothrix sp. G-403 were selected for their disease control capabilities and growth enhancement effects on plants. The GC-MS technique was used to investigate the chemical compounds in the hydroalcoholic extracts of two cyanobacteria species. The analysis shows that the Nostoc sp. G-4D extract contained 28 compounds, accounting for 96.04% of the total composition, while the Calothrix sp. G-403 extract contained 27 compounds, making up 93.62% of the total composition. These findings highlight the rich chemical diversity in the extracts, which might be responsible for the observed bioactivities. The predominant components of the hydroalcoholic extracts of Nostoc sp G-4D and Calothrix sp. G-403 were Hexadecanoic acid, methyl ester (28.29%) and Octadecanoic acid, methyl ester (15.89%) for the former, and Hexadecanoic acid, methyl ester (27.95%) and phytol (10.82%) for the latter.
新一代农业投入品正在研发中，其设计目的是更环保，对消费者健康的负面影响更小。基于生物的抗菌化合物就是这样一个例子。这些化合物用于对抗病原体并刺激植物免疫系统，降低病害严重程度。本研究评估了念珠藻目中55种蓝藻的悬浮液和水醇提取物对番茄植株的抗菌作用和促生长活性。选取了两种蓝藻——念珠藻属G - 4D和眉藻属G - 403，其0.5和1 mg/mL的悬浮液和提取物因其对病害的控制能力和对植物的生长促进作用而被选中。采用气相色谱 - 质谱联用（GC - MS）技术研究了两种蓝藻水醇提取物中的化学成分。分析表明，念珠藻属G - 4D提取物含有28种化合物，占总成分的96.04%，而眉藻属G - 403提取物含有27种化合物，占总成分的93.62%。这些发现突出了提取物中丰富的化学多样性，这可能是观察到的生物活性的原因。念珠藻属G - 4D和眉藻属G - 403水醇提取物的主要成分，前者是十六烷酸甲酯（28.29%）和十八烷酸甲酯（15.89%），后者是十六烷酸甲酯（27.95%）和叶绿醇（10.82%）。
