Puente M E, Li C Y, Bashan Y
Environmental Microbiology Group, Center for Biological Research of the Northwest (CIB), P.O. Box 128, La Paz, B.C.S. 23000, Mexico.
Plant Biol (Stuttg). 2004 Sep;6(5):643-50. doi: 10.1055/s-2004-821101.
Four bacterial species isolated from the rhizoplane of cacti growing in bare lava rocks were assessed for growth promotion of giant cardon cactus seedlings (Pachycereus pringlei). These bacteria fixed N(2), dissolved P, weathered extrusive igneous rock, marble, and limestone, and significantly mobilized useful minerals, such as P, K, Mg, Mn, Fe, Cu, and Zn in rock minerals. Cardon cactus seeds inoculated with these bacteria were able to sprout and grow normally without added nutrients for at least 12 months in pulverized extrusive igneous rock (ancient lava flows) mixed with perlite. Cacti that were not inoculated grew less vigorously and some died. The amount of useful minerals (P, K, Fe, Mg) for plant growth extracted from the pulverized lava, measured after cultivation of inoculated plants, was significant. This study shows that rhizoplane bacteria isolated from rock-growing cacti promote growth of a cactus species, and can help supply essential minerals for a prolonged period of time.
从生长在裸露熔岩岩石上的仙人掌根际分离出的四种细菌，被评估对巨人柱仙人掌幼苗（Pachycereus pringlei）生长的促进作用。这些细菌能够固氮、溶解磷、风化喷出火成岩、大理石和石灰石，并显著地从岩石矿物中释放出有用的矿物质，如磷、钾、镁、锰、铁、铜和锌。接种了这些细菌的巨人柱仙人掌种子，在与珍珠岩混合的粉碎喷出火成岩（古代熔岩流）中，无需添加养分就能正常发芽并生长至少12个月。未接种的仙人掌生长较弱，有些甚至死亡。接种植物培养后，从粉碎熔岩中提取的对植物生长有用的矿物质（磷、钾、铁、镁）的量很可观。这项研究表明，从生长在岩石上的仙人掌根际分离出的细菌能促进一种仙人掌物种的生长，并能在较长时间内帮助提供必需的矿物质。
