The present study aimed to elucidate the influence of drought and elevated temperature on relative abundance and functioning of the ectomycorrhizal fungus Cenococcum geophilum on three oak species differing in adaptation to a warm and dry climate. The experiment QUERCO comprised three Quercus species (Q. robur, Q. petraea, Q. pubescens) grown for 3 years under four treatments: elevated air temperature, drought, a combination of the two, and control. Fine root samples were analysed for relative abundance and potential extracellular enzyme activities of ectomycorrhizae of C. geophilum, a fungal species known to be drought resistant. The relative abundance of C. geophilum on the roots of the oak species was significantly increased by temperature, decreased by drought, but unchanged in the combined treatment compared to the control. Although the extent of treatment effects differed among oak species, no significant influence of tree species on relative abundance of C. geophilum was detected. Exoenzyme activities of C. geophilum on Q. robur and Q. petraea (but not Q. pubescens) significantly increased in the combined treatment, but for all oak species were reduced under drought and air warming alone compared to the control. There was a significant negative correlation between abundance of C. geophilum and its leucine aminopeptidase activity. As this enzyme is not frequent among ectomycorrhizal fungi, this emphasises the functional importance of C. geophilum in the ectomycorrhizal community. Our results indicate that increased temperature and drought will influence the relative abundance and enzyme activity of C. geophilum. However, both the Quercus species and C. geophilum tolerated warming and strong drought.

译文

:本研究旨在阐明干旱和高温对三种不同适应温暖干燥气候的橡树外生菌根真菌Cenococcum geophilum相对丰度和功能的影响。实验QUERCO包括3种在3年中生长的栎类(Q.robur,Q.petraea,Q.pubescens):升高的温度,干旱,二者的结合和控制。分析了细根样品的地衣芽孢杆菌(C.geophilum)的外生菌根的相对丰度和潜在的胞外酶活性,这是一种已知具有抗旱性的真菌。橡木树根上的地衣梭菌的相对丰度随着温度的升高而显着增加,由于干旱而降低,但与对照相比,联合处理中的相对丰度没有变化。尽管橡木树种的处理效果程度不同,但未检测到树木种对C.geophilum相对丰度的显着影响。与对照相比,组合处理中地衣梭菌对罗布氏菌和白屈菜的外酶活性显着增加,但对所有橡树种而言,仅在干旱和空气加热下,其外酶活性显着降低。嗜碱梭菌的丰度与其亮氨酸氨肽酶活性之间存在显着的负相关性。由于这种酶在外生菌根真菌中不常见,因此强调了C.geophilum在外生菌根群落中的功能重要性。我们的结果表明,温度升高和干旱会影响地衣梭菌的相对丰度和酶活性。但是,栎属物种和C.geophilum都可以忍受变暖和强烈干旱。

+1
+2
100研值 100研值 ¥99课程
检索文献一次
下载文献一次

去下载>

成功解锁2个技能,为你点赞

《SCI写作十大必备语法》
解决你的SCI语法难题!

技能熟练度+1

视频课《玩转文献检索》
让你成为检索达人!

恭喜完成新手挑战

手机微信扫一扫,添加好友领取

免费领《Endnote文献管理工具+教程》

微信扫码, 免费领取

手机登录

获取验证码
登录