Nectar robbing by bees affects the reproductive fitness of the distylous plant Tirpitzia sinensis (Linaceae),Ecology and Evolution

当前位置： X-MOL 学术 › Ecol. Evol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Nectar robbing by bees affects the reproductive fitness of the distylous plant Tirpitzia sinensis (Linaceae)
Ecology and Evolution ( IF 2.3 ) Pub Date : 2023-11-10 , DOI: 10.1002/ece3.10714
Xiaoyue Wang _{1,

2} , Renxiu Yao _{1,

2} , Xiaoqin Lv _{1,

2} , Yin Yi _{1,

2} , Xiaoxin Tang _{1,

2}

Affiliation

Nectar robbing can affect plant reproductive success directly by influencing female and male fitness, and indirectly by affecting pollinator behavior. Flowers have morphological and chemical features that may protect them from nectar robbers. Previous studies on nectar robbing have focused mainly on homotypic plants. It remains unclear how nectar robbing affects the reproductive success of distylous plants, and whether defense strategies of two morphs are different. Nectar-robbing rates on the long- and short-styled morph (L-morph, S-morph) of the distylous Tirpitzia sinensis were investigated. We compared floral traits, the temporal pattern of change in nectar volume and sugar concentration, nectar secondary metabolites, and sugar composition between robbed and unrobbed flowers of two morphs. We tested direct effects of nectar robbing on female and male components of plant fitness and indirect effects of nectar robbing via pollinators. Nectar-robbing rates did not differ between the two morphs. Flowers with smaller sepals and petals were more easily robbed. The floral tube diameter and thickness were greater in L-morphs than in S-morphs, and the nectar rob holes were significantly smaller in L-morphs than in S-morphs. Nectar robbing significantly decreased nectar replenishment rate but did not affect nectar sugar concentration or sugar composition. After robbery, the quantities and diversity of secondary compounds in the nectar of S-morphs increased significantly and total relative contents of secondary compounds in L-morphs showed no obvious changes. Nectar robbing could decrease female fitness by decreasing pollen germination rate and thus decreasing seed set. Nectar robbing had no significant effects on male fitness. Robbed flowers were less likely to be visited by hawkmoth pollinators, especially in S-morphs. These results suggest that nectar robbing could directly and indirectly decrease the female fitness of T. sinensis, and different morphs have evolved different defense mechanisms in response to nectar-robbing pressure.

中文翻译：

蜜蜂抢夺花蜜会影响二型植物 Tirpitzia sinensis （Linaceae）的生殖适应性

花蜜抢夺可以通过影响雌性和雄性健康状况直接影响植物的繁殖成功，并通过影响传粉者的行为间接影响植物的繁殖成功。花具有形态和化学特征，可以保护它们免受花蜜劫匪的侵害。以前关于花蜜劫食的研究主要集中在同型植物上。目前尚不清楚花蜜抢夺如何影响二型植物的繁殖成功，以及两种形态的防御策略是否不同。研究了二色 Tirpitzia sinensis 的长型和短型型（L-morph， S-morph）的花蜜抢夺率。我们比较了两种形态的花性状、花蜜体积和糖浓度变化的时间模式、花蜜次生代谢物以及两种形态的花序和未花序的花的糖组成。我们测试了花蜜抢夺对植物适应性的雌性和雄性成分的直接影响，以及通过传粉媒介抢夺花蜜的间接影响。两种变体之间的花蜜抢夺率没有差异。萼片和花瓣较小的花更容易被抢劫。L 型型的花管直径和厚度大于 S 型，L 型的花蜜花洞显著小于 S 型。花蜜抢夺显著降低了花蜜补充率，但不影响花蜜糖浓度或糖成分。抢劫后，S型菌花蜜中次生化合物的数量和多样性显著增加，L型种中次生化合物的总相对含量无明显变化。抢蜜可以通过降低花粉发芽率从而降低雌性健康状况，从而减少结实率。花蜜抢夺对男性健康状况没有显著影响。被抢劫的花朵不太可能被鹰蛾传粉者访问，尤其是在 S 型中。这些结果表明，采蜜可以直接或间接降低 T. sinensis 的雌性适应性，不同的形态对采蜜压力进化出不同的防御机制。

更新日期：2023-11-14

点击分享查看原文

点击收藏

公开下载

阅读更多本刊新发论文本刊介绍/投稿指南