Department of Microbiology, Federal University of Viçosa, Viçosa, Brazil.
Mycorrhiza. 2014 Feb;24(2):153-9. doi: 10.1007/s00572-013-0519-6. Epub 2013 Aug 3.
The ecology of weed plants includes their interactions with soil microorganisms, such as mutualistic partners that may contribute to their adaptation and competitive success in the agricultural fields. Despite the importance of microorganisms to plant growth, knowledge on weed-symbiont associations is still incipient compared to crops. Thus, a survey for the presence of arbuscular mycorrhiza (AM) and dark septate endophyte (DSE) associations in the roots of 50 weed species was done in three distinct areas during the dry and rainy seasons. We found that 41 and 29 out of the 50 species were associated with AM fungi and DSE, respectively, and 27 species presented both associations. All the plant species not forming AM belong to families thought to be nonmycorrhizal, such as Amaranthaceae, Commelinaceae, Brassicaceae, and Cyperaceae. The most common morphotype of AM observed was the Arum-type. No significant differences were found in root length colonization between the areas or seasons. For 19 species surveyed, this is the first report on their mycorrhizal status.
杂草植物的生态学包括它们与土壤微生物的相互作用，例如互惠共生体，这些共生体可能有助于它们在农业领域中的适应和竞争成功。尽管微生物对植物生长很重要，但与作物相比，杂草-共生体的关联知识仍然处于起步阶段。因此，在旱季和雨季的三个不同地区，对 50 种杂草物种的根系中丛枝菌根（AM）和暗隔内生真菌（DSE）的存在进行了调查。我们发现，50 种物种中有 41 种和 29 种分别与 AM 真菌和 DSE 相关，27 种物种同时具有这两种关联。所有不形成 AM 的植物物种都属于被认为是非菌根的科，例如苋科、鸭跖草科、十字花科和莎草科。观察到的最常见 AM 形态类型是阿隆型。在不同地区或季节之间，根系长度的定殖没有发现显著差异。在所调查的 19 个物种中，这是它们菌根状况的首次报道。
