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In order to explore the growth and branching genetic variation of Casuarina equisetifolia half-sib families at seedling stage, the annual seedlings of 40 half-sib C. equisetifolia families were used as the materials. Genetic analysis was carried out on seven traits: seedling height, ground diameter, dry weight, root shoot ratio, number of lateral branches, angle of lateral branch, and length of lateral branch. At the same time, cluster analysis and multi-trait comprehensive evaluation method were used to select excellent families. The results showed that the growth and branching traits of C. equisetifolia half-sib families at seedling stage varied widely, and the differences of the seven traits among families reached extremely significant level. The family heritability of the growth and branching traits ranged from 0.36 to 0.83, which were controlled by moderate or strong inheritance. Four excellent families, 3-265, 5-373, 1-266 and 2-343, were selected at a 10% selection rate. The real gains of seedling height, ground diameter, dry weight, number of lateral branches and length of lateral branches of the selected families was 21.14%, 19.10%, 41.83%, 19.97% and 18.88%, respectively. The genetic gains were 17.55%, 15.66%, 29.70%, 15.57% and 15.10%, respectively. The effect of selection work was remarkable. C. equisetifolia seedlings have great breeding potential among families. The excellent families selected in this study not only enrich the excellent germplasm resources of C. equisetifolia, but provide better germplasm materials for the subsequent genetic improvement and forest construction of C. equisetifolia.
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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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