1 材料与方法
1.1 试验设计
1.2 样品采集
1.3 指标测定
1.4 数据处理与分析
2 结果与分析
2.1 测序基本结果
表1 样品序列表Table 1 Sample sequence listing |
| 样品 Sample | 序列数 Sequence number/条 | 序列长度 Sequence length/bp | 有效序列数 Effective sequence number/条 | 有效比例 Effective ratio/% |
|---|---|---|---|---|
| B1 | 40 575 | 410.86 | 26 355 | 64.95 |
| B2 | 46 960 | 410.88 | 30 327 | 64.58 |
| B3 | 47 387 | 409.83 | 30 749 | 64.89 |
| B4 | 49 738 | 411.21 | 32 615 | 65.57 |
| B5 | 52 800 | 410.56 | 40 100 | 75.95 |
| B6 | 46 356 | 409.12 | 32 978 | 71.14 |
| M1 | 41 079 | 413.08 | 28 092 | 68.39 |
| M2 | 39 166 | 412.39 | 31 207 | 79.68 |
| M3 | 30 442 | 412.34 | 29 004 | 95.28 |
| M4 | 38 760 | 410.51 | 27 022 | 69.72 |
| M5 | 42 683 | 417.81 | 31 509 | 73.82 |
| M6 | 46 736 | 411.87 | 30 759 | 65.81 |
B1~B6为对照组样品;M1~M6为谷氨酰胺组样品。 | |
B1-B6 were control samples; M1-M6 were Gln group samples. |
图1 安哥拉兔肠道菌群稀释曲线B:基础饲粮组;M:谷氨酰胺组。下图同。 横坐标代表随机抽取的序列数量,纵坐标代表可观测到的feature数量。 Fig.1 Rarefaction curve of intestinal flora of Angora rabbits B: basic diet group; M: Gln group. The same as below. X-axis represents number of randomly selected sequences, and Y-axis represents number of observable features. |
2.2 Alpha多样性分析
表2 饲粮中添加谷氨酰胺对安哥拉兔肠道菌群多样性的影响Table 2 Effects of Gln supplementation in diet on intestinal flora diversity of Angora rabbits |
| 项目 Items | 对照组 Control group | 谷氨酰胺组 Gln group | P值 P-value |
|---|---|---|---|
| Sobs指数 Sobs index | 10.33±1.03b | 11.66±1.03a | 0.049 3 |
| Shannon指数 Shannon index | 0.82±0.04b | 1.11±0.18a | 0.004 0 |
| Ace指数 Ace index | 5.52±6.15 | 8.20±6.40 | 0.476 4 |
| Chao指数 Chao index | 10.33±1.03b | 11.66±1.03a | 0.049 3 |
| 覆盖度 Coverage | 1.00±1.22 | 1.00±1.80 | 0.226 2 |
同行数据肩标不同字母表示差异显著(P<0.05)。下表同。 | |
In the same row, values with different letter superscripts mean significant difference (P<0.05). The same as below. |
2.3 Beta多样性分析
2.4 Venn图分析
2.5 谷氨酰胺对安哥拉兔肠道微生物群落组成的影响
表3 门水平肠道菌群菌落组成Table 3 Colony composition of intestinal flora at phylum level% |
| 项目 Items | 对照组 Control group | 谷氨酰胺 Gln group | P值 P-value |
|---|---|---|---|
| 厚壁菌门 Firmicutes | 69.23±5.07a | 51.20±12.66b | 0.008 9 |
| 拟杆菌门 Bacteroidetes | 26.23±5.60 | 27.86±11.66 | 0.763 9 |
| 髌骨细菌门 Patescibacteria | 1.56±0.81 | 6.15±5.65 | 0.077 0 |
| 放线菌门 Actinobacteria | 0.37±0.18 | 6.78±15.10 | 0.322 9 |
| 变形菌门 Proteobacteria | 0.46±0.29 | 5.38±10.95 | 0.297 6 |
| 疣微菌门 Verrucomicrobia | 0.83±0.72 | 1.10±0.88 | 0.573 2 |
表4 属水平肠道菌群菌落组成Table 4 Colony composition of intestinal flora at genus level% |
| 项目 Items | 对照组 Control group | 谷氨酰胺组 Gln group | P值 P-value |
|---|---|---|---|
| g_norank_f_Muribaculaceae | 21.22±6.63 | 21.97±9.90 | 0.881 0 |
| 瘤胃球菌属 Ruminococcus | 12.16±2.03a | 4.03±3.50b | 0.000 6 |
| 瘤胃球菌科NK4A214群 Ruminococcaceae_NK4A214_group | 6.19±2.30 | 7.00±3.21 | 0.624 0 |
| 未分类毛螺菌科Unclassified_f_Lachnospiraceae | 6.27±1.24 | 5.71±1.57 | 0.509 2 |
| 梭菌属UCG-014 Clostridia_UCG-014 | 7.62±0.99a | 3.53±3.75b | 0.027 3 |
| 毛螺菌科NK4A136群Lachnospiraceae_NK4A136_group | 5.86±2.20 | 2.44±3.65 | 0.077 3 |
| 候选糖化假丝酵母菌属 Candidatus_Saccharimonas | 1.56±0.81 | 6.15±5.65 | 0.077 0 |
| 双歧杆菌属 Bifidobacterium | 0.06±0.14 | 0.03±0.04 | 0.343 3 |
| 克里斯滕森菌科R-7群Christensenellaceae_R-7_group | 2.75±0.33 | 3.24±1.31 | 0.395 5 |
| 果胶降解菌属 Monoglobus | 1.69±0.83b | 4.06±1.98a | 0.022 1 |
| 瘤胃球菌科V9D2013群 Ruminococcaceae_V9D2013_group | 3.01±1.30 | 1.88±1.94 | 0.264 1 |
| 不动杆菌属 Acinetobacter | 0.00±0.01 | 0.37±0.47 | 0.297 0 |
图5 属水平下不同组物种相对丰度norank_f_Muribaculaceae:属于拟杆菌门;Ruminococcus:瘤胃球菌属;NK4A214_group:NK4A214群;unclassified_f_Lachnospiraceae:未分类毛螺菌科;norank_f_norank_o_Clostridia_UCG-014:梭菌属UCG-014;Lachnospiraceae_NK4A136_group:毛螺菌科NK4A136群;Candidatus_Saccharimonas:候选糖化假丝酵母菌属;Bifidobacterium:双歧杆菌属;Christensenellaceae_R-7_group:克里斯滕森菌科R-7群:Monoglobus:果胶降解菌属;V9D2013_group:V9D2013群;Acinetobacter:不动杆菌属;Alistipes:另枝菌属;Bacteroides:拟杆菌属;unclassified_f_Ruminococcaceae未分类瘤胃球菌科;norank_ f_ norank_O_Clostridia_vadinBB60_group:梭菌属vadinBB60群;Eubacterium_siraeum_group真杆菌科siraeum群;Phascolarctobacterium:考拉杆菌属;norank_ f_ Eubacteriaceae:未分类真杆菌科;Akkermansia:阿克曼氏菌属;Subdoligranulum:罕见小球菌属;norank_ f_ Eubacterium_ coprostanoligenes_ group:真杆菌科coprostanoligenes群;Others:其他。 Fig.5 Relative abundance of species in different groups at genus level |

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