Neyaz Marwa, Gardner Dale R, Creamer Rebecca, Cook Daniel
Plant and Environmental Sciences, New Mexico State University, Las Cruces, NM 88003, USA.
Poisonous Plant Research Laboratory, US Department of Agriculture, Logan, UT 84321, USA.
Microorganisms. 2022 Mar 2;10(3):545. doi: 10.3390/microorganisms10030545.
Several species of fungi from the orders Chaetothyriales and Pleosporales have been reported to produce swainsonine and be associated as symbionts with plants of the Convolvulaceae and Fabaceae, respectively. An endosymbiont belonging to the Chaetothyriales produces swainsonine and grows as an epibiont on the adaxial leaf surfaces of , but how the symbiont passes through plant growth and development is unknown. Herein, different types of microscopy were used to localize the symbiont in seeds and in cross sections of plant parts. The symbiont was found in several tissues including the hilum, the sclereids, and the hypocotyl of seeds. In five-day old seedlings and mature plants, the symbiont was found in the shoot apical meristem (SAM) and the adaxial surface of immature folded leaves. The mycelia generally formed a close association with peltate glandular trichomes. This report provides further data explaining the relationship between the seed transmitted Chaetothyriales symbiont and . These results provide a possible explanation for how this symbiont, and others like may persist and are transmitted over time.
据报道，散囊菌目和格孢腔菌目的几种真菌可产生苦马豆素，并且分别与旋花科和豆科植物形成共生关系。一种属于散囊菌目的内共生菌可产生苦马豆素，并以附生菌的形式生长在[植物名称]叶片的近轴表面，但该共生菌如何在植物生长发育过程中传递尚不清楚。在此，我们使用了不同类型的显微镜技术来定位种子和植物各部分横切面上的共生菌。在包括种脐、石细胞和种子下胚轴在内的多个组织中发现了该共生菌。在五天大的幼苗和成熟植株中，该共生菌存在于茎尖分生组织（SAM）和未成熟折叠叶片的近轴表面。菌丝体通常与盾状腺毛形成紧密联系。本报告提供了更多数据来解释种子传播的散囊菌目共生菌与[植物名称]之间的关系。这些结果为这种共生菌以及其他类似共生菌如何长期存在和传播提供了一种可能的解释。
