Fire frequency effects on cleistogamy expression and progeny performance in Cologania broussonetii,Plant Biology

当前位置： X-MOL 学术 › Plant Biol. › 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.)

Fire frequency effects on cleistogamy expression and progeny performance in Cologania broussonetii
Plant Biology ( IF 4.2 ) Pub Date : 2020-11-12 , DOI: 10.1111/plb.13212
L. M. Carbone _{1,

2} , G. Cascone ₃ , R. Aguilar _{1,

4}

Affiliation

Increased fire frequency usually erodes microenvironmental conditions, causing a drastic limitation of edaphic resources. Thus, the production of permanently closed‐small flowers (cleistogamous, CL) should increase in sites with high fire frequency as this implies a less expensive reproductive assurance strategy. However, because open, insect‐pollinated flowers (chasmogamous, CH) have the potential capacity to outcross via pollinators, CH progeny produced at any site should outperform selfed CL progeny.
We evaluate the effect of fire frequency on the relative production of CL/CH flowers and fruits, and their seed set, along with several progeny performance parameters in Cologania broussonetii (Fabaceae), a resprouting herb with dimorphic cleistogamy native to the Chaco Serrano.
Fire frequency increased cleistogamy expression, reaching extreme levels in high fire frequency sites. Seed set was similarly high for both CH and CL flowers in the unburned condition, while in burned sites the few developed CH flowers set more seeds than CL flowers. However, progeny performance was similar between CH and CL progeny at each and across all fire frequency conditions.
Cleistogamy expression in C. broussonetii is maximized in abiotically degraded frequently burned habitats, although the selfed CL progeny is as successful as potentially outcrossed CH progeny. Fire frequency may decreased floral size and abundance, selecting for autogamous reproduction, which restricts not only the genetic potential of plant populations but also the resources offered to pollinators. At the community level, increased cleistogamy expression may potentially have negative implications for non‐cleistogamous, more outcrossing species surviving in frequently burned environments.

中文翻译：

火频率对Cologania broussonetii的抗配子体表达和子代性能的影响

火灾频率的增加通常会侵蚀微环境条件，从而严重限制教育资源。因此，在高着火频率的地点，应增加永久关闭的小花（顺势繁殖，CL）的产量，因为这意味着较便宜的生殖保证策略。但是，由于开放的，昆虫授粉的花朵（同床异花（CHsmogamous），CH）具有通过传粉媒介杂交的潜在能力，因此在任何位点产生的CH后代都应优于自交的CL后代。
我们评估了火频对CL / CH花卉和果实及其种子的相对产量的影响，以及在Cologania broussonetii（Fabaceae）中的几个后代性能参数，Cologania broussonetii（Fabaceae）是一种具有Chaco Serrano原产地的双态cleosogamy的重生草本。
着火频率提高了顺应性的表达，在高着火频率的部位达到了极高的水平。在未燃烧的条件下，CH和CL花的结实率同样较高，而在燃烧部位，很少发育的CH花结实的种子多于CL花。然而，在每个火频率条件下，CH和CL后代之间的后代性能相似。
在闭花受精表达C. broussonetii最大化在非生物降解频繁烧毁的栖息地，虽然自交后代CL是一样成功潜在异型杂交CH后代。着火频率可能会降低花的大小和丰度，从而选择自生繁殖，这不仅限制了植物种群的遗传潜力，而且还限制了授粉媒介的资源。在社区一级，增高的配伍表达可能对在频繁燃烧的环境中存活的非复配，异种交配的物种产生负面影响。

更新日期：2020-11-12

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11