Interactive effects of Epichloe fungal and host origins on the seed germination of Achnatherum inebrians
Interactive effects of Epichloe fungal and host origins on the seed germination of Achnatherum inebrians
复制标题
芨芨草真菌和寄主起源的交互作用对芨芨草种子萌发的影响
DOI：
10.1007/s13199-019-00636-0
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发表时间：
2019-09-01
期刊：
影响因子：
2.5
通讯作者：
Wang, Hongsheng
中科院分区：
文献类型：
--
作者：
Bao, Gensheng;Song, Meiling;Wang, Hongsheng
冷季型草与Epichelium内生菌形成了共生关系。在许多环境中，植物内生菌通过增加其宿主对非生物或生物胁迫的适应性而被证明是植物的互利共生体。Epichelium内生菌对其他适合度相关的植物特征的影响研究较少，结果通常是可变的和矛盾的。本研究以醉马草为材料，研究了内生真菌感染对醉马草种子萌发的影响。我们的研究结果表明，从高山地区收集的种子在低温下的发芽率高于荒漠和干旱草原的种子。相比之下，较高的发芽率检测到种子与沙漠和干旱草原的起源比那些高山起源在较高的温度。内生真菌感染影响不同来源种子的基本温度。内生菌感染的种子具有较低的基础温度和较高的上限温度比他们的内生菌免费同行。高山草原种子的基础温度值高于荒漠和干旱草原种子。而荒漠和干旱草原种子的顶温高于高寒草原种子。因此，未来的实验应考虑在次优气候条件下内生菌对种子萌发和幼苗补充的影响。
Cool-season grasses have developed a symbiotic relationship with Epichloe endophytes. In many environments, Epichloe endophytes have been shown to be mutualistic symbionts of plants by increasing the fitness of their host against abiotic or biotic stresses. The effects of Epichloe endophytes on other fitness-correlated plant characteristics are less intensively studied, and the results are usually variable and contradictory. In this study, we evaluated the effects of endophyte infection on seed germination in Achnatherum inebrians from four origins. Our results indicate that the germination rate of the seeds collected from alpine regions was higher at low temperatures than that of seeds with desert and arid grassland origins. By contrast, a higher germination percentage was detected in seeds with desert and arid grassland origins than in those with alpine origins in higher temperatures. Epichloe endophyte infection affects the cardinal temperatures of seeds from different origins. Endophyte-infected seeds have a lower base temperature and a higher ceiling temperature than their endophyte-free counterparts. The value of the base temperature was higher in seeds with alpine grassland origins than in those with desert and arid grassland origins. However, the ceiling temperature was higher in seeds with desert and arid grassland origins than in those with alpine grassland origins. Consequently, future experiments should consider the effects of endophytes on seed germination and seedling recruitment in suboptimal climatic conditions.