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The objective of this study is to elucidate the floral characteristics and flowering dynamics of Bougainvillea spp., investigate the variations in pollen viability, stigma acceptability, and cross-compatibility among different varieties, and provide theoretical and technical guidance for the crossbreeding in Bougainvillea spp.. Nine varieties of Bougainvillea were chosen to examine the floral traits and flowering patterns, also to assess pollen viability and stigma acceptability. Suitable parents were selected for cross-pollination, and the germination of pollen tubes along with the seed-setting rate of hybridization were observed. The pollen viability of the six male varieties, measured by the ex vivo germination method was high. Among which, three varieties exhibited high pollen viability and could be used as the male parents. The results from the stigma detection of three varieties by benzidine-hydrogen peroxide method showed that the stigma had the strongest deliverability in the V. period, it was concluded that the low seed-setting rate was due to the substantial amount of callose produced in the stigma and the columella following pollination, which distorted and deformed the pollen tube, resulting in only a limited number of pollen tubes reaching the ovule to complete fertilization. Additionally, significant differences were observed in the seed-setting rates among various hybrid combinations. Incompatibility was noted across various cross combinations, predominantly attributed to pre-fertilization disorders.
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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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