Functional consequences of temporal reversal of height dimorphism for pollen and seed dispersal in a dioecious plant,Journal of Systematics and Evolution

当前位置： X-MOL 学术 › J. Syst. 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.)

Functional consequences of temporal reversal of height dimorphism for pollen and seed dispersal in a dioecious plant
Journal of Systematics and Evolution ( IF 3.4 ) Pub Date : 2023-06-06 , DOI: 10.1111/jse.12960
Zhi‐Hua Zeng _{1,

2,

3,

4} , Qian Yu _{1,

2} , Qing‐Hong Feng ₁ , Xin‐Jia Wang ₂ , Li Zhong ₂ , Hua‐Ying Sun ₅ , Hong Wang ₂ , De‐Zhu Li _{1,

2,

3} , Spencer C.H. Barrett ₆ , Wei Zhou _{1,

2,

3,

7}

Affiliation

The adaptive significance of phenotypic differences between females and males can provide insights into sex-specific selection and the evolution of sexual dimorphism. Dioecious plants commonly exhibit sexual dimorphism in height, although its ecological and evolutionary significance have rarely been examined experimentally. Here, we investigate the functional consequences of the temporal reversal of height dimorphism for pollen and seed dispersal in dioecious Rumex hastatulus Baldw., a species in which males are taller than females at flowering and the reverse pattern occurs at fruiting. Populations of this colonizing weed are wind-pollinated and seeds are wind-dispersed. In a glasshouse experiment we manipulated the height of pollen donors and using sex-specific genetic markers compared the paternal success of males of contrasting height and investigated whether seed families showed evidence of sexual dimorphism in early life-history traits. In a second glasshouse experiment using fruiting plants we also examined how female height influenced the distance that seeds were dispersed. We found that taller males had significantly higher siring success than males of equivalent height to flowering females. Similarly, taller females dispersed fruit to greater distances than shorter females. Female seeds were significantly heavier than male seeds and germinated more rapidly, although early seedling growth was greater in males. Our study suggests that the striking sex reversal of height in R. hastatulus likely functions to optimize the contrasting reproductive functions of the sexes by promoting increased pollen and seed dispersal distances. Improved dispersal quality could limit inbreeding and reduce local mate and resource competition within populations.

中文翻译：

雌雄异株植物花粉和种子传播高度二态性时间逆转的功能后果

雌性和雄性之间表型差异的适应性意义可以提供对性别特异性选择和两性二态性进化的见解。雌雄异体植物通常在高度上表现出两性二态性，尽管其生态和进化意义很少通过实验检验。在这里，我们研究了雌雄异株羊蹄中花粉和种子传播的高度二态性时间逆转的功能性后果Baldw.，一种雄性在开花时比雌性高而在结果时出现相反模式的物种。这种定殖杂草的种群是风媒授粉的，种子是风传播的。在温室实验中，我们操纵了花粉捐赠者的身高，并使用性别特异性遗传标记比较了具有对比身高的男性的父系成功，并调查了种子家族是否在早期生活史特征中表现出性二态性的证据。在使用结果植物进行的第二个温室实验中，我们还研究了雌性身高如何影响种子散布的距离。我们发现，与开花雌性同等身高的雄性相比，高大雄性的繁殖成功率要高得多。同样，较高的雌性比较矮的雌性将果实散布到更远的距离。雌性种子比雄性种子重得多，发芽也更快，尽管雄性种子的早期幼苗生长更快。我们的研究表明，身高显着的性别逆转R. hastatulus可能通过促进花粉和种子传播距离的增加来优化两性对比的生殖功能。改进的传播质量可以限制近亲繁殖并减少种群内的当地配偶和资源竞争。

更新日期：2023-06-06

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南