Stamen dynamics and breeding system of Euscaphis konishii Hayata
In order to study the flowering characteristics and breeding system of Euscaphis konishii Hayata, we observed flower characteristics, floral dynamic and pollination insects during the flowering period. We tested the pollen viability and estimated its stigma receptivity by benzidine-hydrogen peroxide. The breeding system of Euscaphis konishii was tested by the pollen-ovule ratio (P/O), the outcrossing index (OCI), and artificial pol-lination methods. The results showed that the population flower bloomed one time a year from mid-May to ear-ly June, and the flowering order of the cymes inflorescence of Euscaphis konishii was from top to bottom, from the inside to outside. The life span of individual flower was one day. Euscaphis konishii was a plant with bisex-ual flowers that were small. Each flower had 5 stamens, sometimes 4 or 6, and ovary synthesized from 3 car-pels. Floral syndrome could attract pollinators. The pollen viability reached the maximum at 2 hours after an-thers shedding, and stigma receptivity was increased after bloom. The value of P/O was about 255.70±46.50 and the out-crossing index was 3. The experimental results of artificial bagging show that Euscaphis konishii was apogamous and have the highest fruit setting rate, only 48.76％, and the fruit setting rate of naturally self-pollination flowers was lower than that of artificial pollination flowers, indicating the existence of pollina-tion restriction caused by the insufficiency of pollinators. In sum, the reproductive system of Euscaphis konishii could be determined as facultative outcrossing, self-compatible and pollinators depended.
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万方数据
维普
