二型花柱植株金荞麦繁殖特征

开花物候及繁殖分配是植物适应环境的重要因素。对金荞麦开花物候、繁殖分配及策略进行了研究。结果如下:金荞麦的花果期为每年的8—11月,9月集中开花,其集中开花模式有助于吸引昆虫传粉,提高繁殖成功率;金荞麦单花开花持续时间为1—2 d,种群花期均为85d。L型花序花期为15—26d,S型花序花期为14—27d,两者没有显著差异;L型单花序开花数为26—131朵,S型单花序开花数为36—147朵,两者没有显著差异。L型和S型花序开花动态呈现单峰曲线,在花序开花后第11天L型和S型都达到最大值,分别为7.30%和7.20%,且两种花型具有较高的开花同步性,这有助于其繁殖适应性的提高。同一个花型中,雌蕊长、雄蕊长之间存在极显著负相关,但雌雄总长不存在显著差异,表明雌蕊长、雄蕊长可能存在权衡关系;金荞麦的繁殖器官和营养器官生物量在L型和S型间不存在显著差异,但其花生物量与植株生物量表现出极显著正相关关系。金荞麦L型花生物量分配极显著大于S型,而总生物量不存在显著差异,说明金荞麦植株的营养生长与有性繁殖间存在权衡关系。

Flowering phenology and reproductive strategy study of distyly Fagopyrum Cymosum

Flowering phenology and reproductive allocation are important factors to adapt to the environment. The article studied the flowering phenology and reproductive allocation of Fagopyrum dibotrys. Fagopyrum dibotrys flowered from August to November, mainly in September, centralized flowering contributes to insects pollination and improves reproductive success; Fagopyrum dibotrys flowered 1 to 2 days for a single flower, 85 days for the population. Long-styled capitulum flowered 15 to 26 days, short-styled capitulum flowered 14 to 27 days, the difference is not significant; The flower number of the long-styled single capitulum is 26 to 131, the short-styled capitulum is 36 to 147, the difference is not significant. Flowering dynamic of F. dibotrys''s long-styled and short-styled capitulum presented unimodal curve, long-styled and short-styled capitulum both reached maximum 11days after flowering, was 7.30% and 7.20% respectively, and the two floral morphs maintained high synchronization of flowering, contributing to increase the reproductive adaptability. Pistil and stamens length exhibited very significant negative correlation in the same floral morphs, but the total length showed no significant difference, which showed that there is a trade-off relationship; Fagopyrum dibotrys''s vegetative organs and reproductive organs biomass existed no significant difference between the long-styled and short-styled, while their floral biomass and plant biomass showed very significant difference. F. cymosum''s floral biomass allocation ratio of the long-styled is significantly larger than the short-styled, but the total biomass showed no significant difference, which showed that there is a trade-off relationship in Fagopyrum dibotrys''s vegetative growth and sexual reproduction.