The Baja California desert harsher environment harbors a limited biodiversity due to extreme conditions like low moisture of sandy soils and high soil temperature. In the present study, actinobacteria from soil of Baja California desert was isolated and their properties as plant growth promoter and antifungal activity were evaluated. Streptomyces netropsis strain A-ICA was isolated and identified based on 16 S rDNA sequences from rhizosphere of native plant Larrea tridentata. The cell suspension and the cell-free supernatant of its culture showed significant antifungal activity against Macrophomina phaseolina, Fusarium oxysporum, Fusarium solani, Fusarium equiseti, Botrytis cinerea, Alternaria alternata and Colletotrichum gloeosporioides. Additionally, the results showed the potential of this strain for production of phytohormones (indol acetic acid and giberrelins) and exhibited highest concentration of soluble-P with the biggest drop in pH. Overall, the results of this study indicate that potential of S. netropsis strain A-ICA isolated from Baja California desert as a significant plant growth promoter and biocontrol agent to reduce growth of phytopathogens.

由于极端条件（例如沙土的低水分和高土壤温度），巴哈加州沙漠更恶劣的环境中生物多样性有限。在本研究中，从下加利福尼亚州沙漠的土壤中分离出放线菌，并评估了其作为植物生长促进剂和抗真菌活性的性质。基于天然植物Larrea tridentata的根际的16 S rDNA序列，分离并鉴定了链霉菌A.ICA菌株。细胞悬浮液和其培养物的无细胞上清液对菜豆（Macphophomina phaseolina），尖孢镰刀菌（Fusarium oxysporum），茄镰刀菌（Fusarium solani），马齿镰刀菌（Fusarium equiseti），灰葡萄孢菌（Botrytis cinerea），链格孢菌（Alternaria alternata）和炭疽菌（Colletotrichum gloeosporioides）具有显着的抗真菌活性。此外，结果表明该菌株具有生产植物激素（吲哚乙酸和吉非瑞林）的潜力，并且可溶P的浓度最高，pH值下降最大。总体而言，这项研究的结果表明，从巴哈加州沙漠中分离出的链霉菌菌株A-ICA作为降低植物病原体生长的重要植物生长促进剂和生物防治剂的潜力。