文献类型： 外文期刊

作者： Liang, Zeyi ¹ ; Zhang, Jianbo ¹ ; Ahmad, Anum Ali ¹ ; Han, Jianlin ³ ; Gharechahi, Javad ⁵ ; Du, Mei ¹ ; Zheng, Juanshan ¹ ; Wang, Peng ² ; Yan, Ping ¹ ; Salekdeh, Ghasem Hosseini ⁶ ; Ding, Xuezhi ¹ ;

作者机构： 1.Chinese Acad Agr Sci, Lanzhou Inst Husb & Pharmaceut Sci, Key Lab Yak Breeding Engn, Lanzhou, Peoples R China

2.Chinese Acad Agr Sci, Lanzhou Inst Husb & Pharmaceut Sci, Key Lab Vet Pharmaceut Dev, Minist Agr & Rural Affairs, Lanzhou, Peoples R China

3.Int Livestock Res Inst ILRI, Livestock Genet Program, Nairobi, Kenya

4.Chinese Acad Agr Sci CAAS, Inst Anim Sci, CAAS ILRI Joint Lab Livestock & Forage Genet Reso, Beijing, Peoples R China

5.Baqiyatallah Univ Med Sci, Human Genet Res Ctr, Tehran, Iran

6.Agr Res Educ & Extens Org, Agr Biotechnol Res Inst Iran, Dept Syst Biol, Karaj, Iran

7.Macquarie Univ, Dept Mol Sci, N Ryde, NSW, Australia

关键词： yak; cattle; natural grazing; rumen anaerobic fungi; seasonal dynamics

期刊名称：MICROBIOLOGY SPECTRUM （ 影响因子：3.7； 五年影响因子：5.9 ）

ISSN： 2165-0497

年卷期： 2023 年 11 卷 5 期

页码：

收录情况： SCI

摘要： Anaerobic fungi (AF) inhabit the gastrointestinal tract of ruminants and play an important role in the degradation of fiber feed. However, limited knowledge is available on seasonal dynamics and inter-species differences in rumen AF community in yak and cattle under natural grazing systems. Using the random forests model, the null model, and structural equation model, we investigated the seasonal dynamics and key driving factors of fiber-associated rumen AF in grazing yak and cattle throughout the year on the Qinghai-Tibet Plateau (QTP). We found that the richness and diversity of rumen AF of grazing yak and cattle in cold season were significantly higher than those in warm season (P < 0.05). We identified 12 rumen AF genera, among which , Cyllamyces, and Orpinomyces were predominant in the rumen of both grazing yak and cattle. LEfSe and random forest analysis showed that Feramyces, Tahromyces, and Buwchfawromyces were important seasonal indicator of rumen AF in grazing yak (P < 0.05), and Caecomyces, Cyllamyces, and Piromyces in grazing cattle (P < 0.05). Null model analysis revealed that the dynamic changes of rumen AF community structure were mainly affected by deterministic factors. Notably, mantel test and structural equation model revealed that forage physical-chemical properties, including dry matter (DM), neutral detergent fiber (NDF), and hemicellulose contents (HC) were the key factors driving the seasonal variations of the rumen AF community (P < 0.05). The results revealed that forage lignocellulose was probably an important factor affecting the seasonal dynamics and inter-species differences of the rumen AF community under natural grazing conditions. IMPORTANCE The seasonal dynamics of rumen anaerobic fungi in nature grazing yak and cattle were determined during cold and warm seasons based on pasture nutritional quality and environmental data sets. The main driving factors of anaerobic fungi in yak and cattle rumen were explored by combining random forest and structural equation models. In addition, the dynamic differences in the composition of the anaerobic fungi community in the yak and cattle in different seasons were characterized. It was found that some rumen anaerobic fungi have contributed to high fiber degradation rate in yak. These novel findings improve our understanding of the association of environmental and dietary seasonal variations with anaerobic fungal community, facilitating yak adaptation to high altitude.