INDIRECT COSTS OF SEED PRODUCTION WITHIN AND BETWEEN SEASONS IN A GYNODIOECIOUS SPECIES
INDIRECT COSTS OF SEED PRODUCTION WITHIN AND BETWEEN SEASONS IN A GYNODIOECIOUS SPECIES
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DOI：
10.1007/bf00317374
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发表时间：
1992-11-01
期刊：
影响因子：
2.7
通讯作者：
ASHMAN, TL
中科院分区：
文献类型：
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作者：
ASHMAN, TL
二型物种，特别是那些单性和雌雄同体的个体，提供了一个机会，研究资源分配到生殖功能的动态。在这项研究中，我调查的影响，操纵种子生产的生殖分配在一个季节内和季节之间的雌性和雌雄同体的雌株Sidalcea oregana ssp。穗状花序。对植物进行人工授粉以确保最大的结实（种子植物），或禁止授粉和结实（无种子植物）。这些处理是有效的;种子植物平均产生120粒种子，而无种子植物不产生种子。在一个季节内，种子植物和无种子植物产生类似数量的花，但种子植物显着减少分配给每朵花的生物量相比，无种子植物。两性异形在每花分配不同;雌雄同体分配显着更多的生物量，大多数花的结构（除了胚珠）相对于女性。尽管如此，有性变异表现出类似的比例减少花的大小，种子生产。当分配到花卉展示的特点是花瓣长度，在本赛季的性形态反应不同，雌雄同体，在这两种种子处理，保持较大的花瓣在本赛季，而女性大大减少了他们的。如果花粉去除与花瓣大小呈正相关，这可以解释为自适应。在种子生产的操作后的季节，在1989年生产种子的植物在1990年减少分配到花序（和花）相比，在1989年没有生产种子的植物。季节之间的营养生长没有发现类似的趋势。性变形没有显着差异，在他们的季节之间的反应，种子处理。
Dimorphic species, especially those with unisexual and hermaphroditic individuals, provide an opportunity to study the dynamics of resource allocation to reproductive function. In this study, I investigated the effects of manipulating seed production on reproductive allocation within a season and between seasons in females and hermaphrodites of gynodioecious Sidalcea oregana ssp. spicata. Plants were either hand-pollinated to ensure maximum seed set (seed plants), or prohibited from pollination and seed set (no-seed plants). These treatments were effective; seed plants produced an average of 120 seeds whereas no-seed plants produced no seeds. Within a season, seed plants and no-seed plants produced similar numbers of flowers, but seed plants significantly reduced the amount of biomass allocated to each flower compared to no-seed plants. The sexual morphs differed in per-flower allocation; hermaphrodites allocated significantly more biomass to most floral structures (except to ovules) relative to females. Nonetheless, the sexual morphs exhibited similar proportional reductions in flower size in response to seed production. When allocation to floral display was characterized by petal length, the sexual morphs responded differently during the season; hermaphrodites, in both seed treatments, maintained larger petals over the season while females greatly reduced theirs. This could be interpreted as adaptive if pollen removal is positively related to petal size. In the season following the manipulations of seed production, plants which produced seeds in 1989 had reduced allocation to inflorescences (and flowers) in 1990 compared to plants which did not produce seeds in 1989. A similar trend was not detected for vegetative growth between seasons. The sexual morphs did not differ significantly in their between season responses to the seed treatment.