...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Plant biology >Pollinator directionality as a response to nectar gradient: promoting outcrossing while avoiding geitonogamy
【24h】

Pollinator directionality as a response to nectar gradient: promoting outcrossing while avoiding geitonogamy

机译：授粉媒介定向性对花蜜梯度的响应：促进异型杂交，同时避免基因突变

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Plants with multiple flowers could be prone to autonomous self-pollination and insect-mediated geitonogamy, but physiological and ecological features have evolved preventing costs related to autogamy. We studied the rare perennial herb Dictamnus albus as a model plant, with the aim of describing the plant-pollinator system from both plant and pollinator perspectives and analysing features that promote outcrossing in an entomophilous species. The breeding system and reproductive success of D. albus were investigated in experimental and natural conditions, showing that it is potentially self-compatible, but only intra-inflorescence insect-mediated selfing is possible. Nectar analysis showed gender-biased production towards the female phase, which follows the male phase, and during flowering, full blooming is found in flowers at the bottom of the raceme. Among a wide spectrum of insect visitors, three genera (Bombus, Apis, Megachile) were found to be principal pollinators. A study of insect behaviour showed a tendency towards bottom-to-top flights for the most important pollinators Bombus spp. and Apis mellifera: upward movements on the racemes could be explained by foraging behaviour, from more to less rewarding flowers. In accordance with the 'declining reward hypothesis', bumblebees and honeybees leave the plant when gain of reward is low, after which few flowers are visited, reducing the chance of self-pollen transfer among flowers. Intra-flower self-pollination is prevented in D. albus by protandry and herkogamy, while the nectar-induced sequential pattern of pollinator visits avoids geitonogamy and tends to maximise pollen export, promoting outcrossing. All these features for preventing selfing benefit plant fitness and population genetic structure.
机译：具有多花的植物可能易于自花授粉和昆虫介导的基因配子体，但是生理和生态学特征已经进化，可以防止与配子体相关的成本。我们研究了多年生稀有多年生草本植物Dictamnus albus作为模型植物，目的是从植物和传粉媒介的角度描述植物-传粉媒介系统，并分析促进嗜虫物种异交的特征。在实验和自然条件下，对白D的繁殖系统和繁殖成功进行了研究，表明其具有潜在的自我相容性，但只有花序内昆虫介导的自交是可能的。花蜜分析显示，雌性阶段向雄性阶段发展，而雌性阶段则偏向性别;在开花期间，总状花序底部的花朵发现完全开花。在各种各样的昆虫访客中，三个属（Bombus，Apis，Megachile）是主要的传粉媒介。对昆虫行为的研究表明，最重要的传粉者Bombus spp有从下往上飞行的趋势。蜜蜂和蜜蜂：花序上的向上运动可以通过觅食行为来解释，从多花的花朵到少花的花朵。根据“递减的报酬假说”，当报酬的收益较低时，大黄蜂和蜜蜂离开植物，此后很少见花，从而减少了花粉之间自我花粉转移的机会。百日草（D. albus）的花粉自花授粉通过protandry和herkogamy来防止，而由花蜜引起的传粉者探访的顺序模式避免了geitonogamy，并倾向于最大化花粉输出，促进异交。防止自交的所有这些特征有益于植物适应性和种群遗传结构。

著录项

相似文献

  • 外文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号