Floral costs in Nigella sativa (Ranunculaceae):: Compensatory responses to perianth removal
Floral costs in Nigella sativa (Ranunculaceae):: Compensatory responses to perianth removal
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DOI：
10.3732/ajb.92.2.279
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发表时间：
2005-02-01
影响因子：
3
通讯作者：
Andersson, S
中科院分区：
文献类型：
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作者：
Andersson, S
由于内部资源是有限的，人们一直认为，有吸引力的花器官代表了植物能量和营养预算的显着消耗。尽管这种权衡具有广泛的意义，但在相对较少的研究中，研究人员操纵了花卉投资，然后评估了随后生产的花朵，果实和种子的分配。在本研究中的黑种草，成熟和/或保持花被的成本记录后，所有的萼片和蜜腺被删除在芽期和一个显着增加的平均种子质量，分配到种子生产的生物量的总量，和平均发芽率的母体种子作物进行了测量。增加的生物量，碳，氮分配到种子的生物量，碳，氮投入到萼片和蜜腺后，花被去除的减少幅度相似。花被去除没有显着影响花产量，母体繁殖力，或后代种子数量。综上所述，这些观察结果表明，潜在的选择介导的资源权衡与种子质量和时间发芽的原因，或至少促进，进化减少花的大小。
Because internal resources are finite, it has been assumed that attractive, floral organs represent a significant drain on the energy and nutrient budget of a plant. Despite the broad significance of such trade-offs, in relatively few studies have investigators manipulated floral investments, then evaluated allocation to subsequently produced flowers, fruits, and seeds. In the present study of Nigella sativa, the cost of maturing and/or maintaining perianths was documented after all sepals and nectaries were removed at the bud stage and a significant increase in mean seed mass, the total amount of biomass allocated to seed production, and mean germination rate of the maternal seed crop were measured. The increased biomass, carbon, and nitrogen allocated to seeds were similar in magnitude to the reduction in biomass, carbon, and nitrogen invested in sepals and nectaries after perianth removal. Perianth removal did not significantly affect flower production, maternal fecundity, or progeny seed number. Taken together, these observations indicate the potential for selection-mediated through resource trade-offs with seed mass and time to germination-to cause, or at least facilitate, evolutionary reductions in flower size.