Large variation in flower size of the myco‐heterotrophic plant, Monotropastrum globosum: effect of floral display on female reproductive success
Large variation in flower size of the myco‐heterotrophic plant, Monotropastrum globosum: effect of floral display on female reproductive success
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真菌异养植物 Monotropastrum globosum 花大小的巨大变化：花展示对雌性繁殖成功的影响
DOI：
10.1046/j.1442-1984.2002.00077.x
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发表时间：
2002
影响因子：
1.4
通讯作者：
Akio Imamura
中科院分区：
文献类型：
--
作者：
A. Ushimaru;Akio Imamura
摘要我们研究了一种非绿叶真菌异养植物球状单叶草花的大小变化以及花展示与传粉者和传播前种子捕食者吸引之间的关系。我们发现这一物种的花大小有很大的差异，类似于其他真菌异养植物的报告。通过测量授粉、结实成功和种子预扩散捕食，研究了花朵大小和数量对雌性生殖成功的影响。我们没有发现传粉者(大黄蜂)对花的大小或数量做出反应的证据，但捕食性种子捕食者(鳞翅目幼虫)喜欢花更大、更多的植物，尽管捕食频率不高。因此，我们没有检测到更大的花朵展示对该物种雌性生殖成功的任何影响。花大小无关的授粉成功和较低的捕食压力可能是导致球花大小变异的原因。结实率低于授粉花，大花比小花更易座果，说明球果属植物的座果资源有限。
Abstract We investigated floral size variation and the relationship between floral display and pollinator and predispersal seed predator attraction in an achlorophyllous, myco-heterotrophic plant, Monotropastrum globosum. We found substantial variation in flower size in this species, similar to reports for other myco-heterotrophic plants. We examined the effects of flower size and number on female reproductive success by measuring pollination and fruiting success and predispersal seed predation. We found no evidence that pollinators (bumblebees) responded to either flower size or number, but predispersal seed predators (Lepidopteran larvae) preferred plants with larger, more numerous flowers, although predation frequency was not high. Therefore, we did not detect any effect of larger floral displays on female reproductive success in this species. Flower size independent pollination success and low predation pressure might allow the large floral size variation in M. globosum. The percentage of fruiting flowers was lower than that of pollinated flowers and larger flowers tended to set fruit more often than smaller ones, suggesting that fruit set in M. globosum is resource-limited.