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Outline
To provide key data for feeding oat breeding in Chengdu plain, the genetic diversity of agronomic traits of 179 oat germplasm accessions were objectivly evaluated in this research. 14 agronomic traits were evaluated, a morphological diversity index was calculated for each of them. The cluster and principal component analyses were performed for 10 selected quantitative traits among them. It was found that the trait with the highest genetic diversity index was length of flag leaf (H′=2.04), and the highest coefficient of variation (33.41%) was for vegetative tiller number. Cluster analysis divided the 179 oat germplasm accessions into five major groups. Group Ⅰ would provide excellent parent material for breeding seed varieties. Group Ⅱ was with potential for breeding high for tillering ability. Group Ⅲ was without obvious beneficial traits. The characters of group Ⅳ were general. Group Ⅴ was considered to provide excellent parent material for breeding projects involving multiple target traits. The principal component analysis reduced the 10 analyzed traits to 5 principal components which cumulatively explained 84.57% of the data variation. The first principal component was closely related to nutrient composition of forage grass. The second and the third principal component mainly reflected the leaf morphological characteristics. The fourth principal component mainly reflected tiller. The fifth principal component mainly reflected height. Tin summary, the 179 evaluated oat germplasm accessions introduced to Chengdu plain, have wide genetic diversity. Multivariate evaluation of measured traits indicated that accessions CF002393, CF003690, CF014719 and CF003691 can be used as parents to improve local oat varieties.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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