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Sex Allocation Plasticity in Response to Resource and Pollination Availability in the Annual Plant Brassica rapa (Brassicaceae) 一年生植物芸苔科植物性别分配可塑性对资源和授粉有效性的响应
3区 生物学 Q3 PLANT SCIENCES Pub Date : 2023-09-01 DOI: 10.1086/725386
Susana Wadgymar, Nikolet Kostur
Premise of research. Cosexual plants reproduce as females by maturing seeds from fertilized ovules and as males by fertilizing their own ovules or those of other plants. Condition-dependent sex allocation occurs when the environment elicits quantitative differences in the rate at which fitness increases as resources are invested in male versus female function. Here, we examine whether resource availability and the pollination environment generate plastic responses in floral sex allocation and correlated traits.Methodology. We exposed the cosexual mustard species Brassica rapa to variation in resource availability (altered pot size) and in the pollination environment (unpollinated or fully pollinated). We assessed investment in anther and ovary length, which are known to correlate with pollen and ovule number; in flower buds produced at the onset of reproduction; and in buds produced approximately 15 d later. We also measured plant size and flower size, which are often correlated with increased allocation to female and male function, respectively.Pivotal results. In contrast to our predictions, anther-to-ovary length ratios at the onset of reproduction did not vary across plants of different sizes and were unaffected by the pot size treatment, despite an increase in anther lengths in the small pot treatment. Similarly, neither the pot size nor the pollination treatments elicited plasticity in anther-to-ovary length ratios over the course of reproduction. However, independent of plant size and as predicted, plants produced larger flowers over the course of reproduction in the pollination-absent treatment.Conclusions. We discuss the contexts in which resource availability and the pollination environment can influence sex allocation and provide cautionary advice on effective methods for experimentally generating and measuring sex allocation plasticity.
研究的前提。雌雄同体植物通过受精的胚珠使种子成熟而繁殖为雌性,通过使自己的胚珠或其他植物的胚珠受精而繁殖为雄性。当资源投资于男性和女性的功能时,环境导致适合度增加的数量差异时,条件依赖性性别分配就发生了。在此,我们研究了资源有效性和授粉环境是否在花的性别分配和相关性状中产生可塑性响应。本研究将雌雄同体的油菜品种暴露在不同的资源可用性(改变花盆大小)和授粉环境(未授粉或完全授粉)下。我们评估了与花粉和胚珠数量相关的花药和子房长度的投入;在繁殖开始时产生的花蕾中;大约15天后产生了芽。我们还测量了植物大小和花的大小,它们通常分别与雌性和雄性功能的分配增加相关。关键的结果。与我们的预测相反,繁殖开始时花药与子房的长度比在不同大小的植株之间没有变化,并且不受盆栽大小处理的影响,尽管小盆栽处理的花药长度增加了。同样,在繁殖过程中,花盆大小和授粉处理都没有引起花药与子房长度比的可塑性。然而,正如预测的那样,与植株大小无关的是,在不授粉的处理下,植株在繁殖过程中开出了更大的花。我们讨论了资源可用性和授粉环境对性别分配的影响,并对实验产生和测量性别分配可塑性的有效方法提出了警告性建议。
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引用次数: 0
Front Matter 前页
3区 生物学 Q3 PLANT SCIENCES Pub Date : 2023-09-01 DOI: 10.1086/727746
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引用次数: 0
Integrating Cretaceous fossils into the phylogeny of living angiosperms: fossil Magnoliales and their evolutionary implications 白垩纪化石与被子植物系统发育的整合:木兰花化石及其进化意义
IF 2.3 3区 生物学 Q3 PLANT SCIENCES Pub Date : 2023-08-24 DOI: 10.1086/727523
J. Doyle, P. K. Endress
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引用次数: 0
Pollen transfer within flowers: how pollen is secondarily presented 花内的花粉转移:花粉是如何二次呈现的
IF 2.3 3区 生物学 Q3 PLANT SCIENCES Pub Date : 2023-08-24 DOI: 10.1086/727514
J. H. E. Ottra, João Felipe Ginefra Toni, P. Thaowetsuwan, P. D. Santos, Julius Jeiter, L. R. Craene, Kester Bull-Hereñu, Regine Claβen–Bockhoff
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引用次数: 1
A Second Species of Tricosta Expands the Diversity of the Intriguing Mesozoic Tricostate Mosses 第二种三角藓扩展了有趣的中生代三角藓的多样性
IF 2.3 3区 生物学 Q3 PLANT SCIENCES Pub Date : 2023-08-21 DOI: 10.1086/726016
Candela Blanco‐Moreno, Marc Valois, R. Stockey, G. Rothwell, A. Tomescu
Premise of research. Early Cretaceous (Valanginian) rocks exposed at Apple Bay (Vancouver Island, Canada) have yielded numerous anatomically preserved bryophytes that have expanded our knowledge of the pre-Cenozoic fossil record of this group. A new moss type with tricostate leaves from Apple Bay combines characters not encountered in moss species recorded previously, warranting in-depth characterization of a new taxon. Methodology. Carbonate concretions containing permineralized fossil material were sectioned using the cellulose acetate peel technique. The resulting acetate peels providing serial sections through the bryophyte specimens were used to reconstruct the habit of the plant and its leaves in two and three dimensions. Pivotal results. We describe a new species of moss in the family Tricostaceae, Tricosta priapiana sp. nov. The anatomy and morphology of the new species justify expanding and refining the diagnoses of Tricostaceae and Tricosta, especially with respect to perigonial branches and the morphology of branch buds. The presence of pseudoparaphyllia surrounding the branch buds supports the pleurocarpous affinities proposed previously for the Tricostaceae. Conclusions. Tricosta priapiana adds to the diversity of tricostate mosses, an extinct group that was intriguingly diverse in the Mesozoic. Nevertheless, the tricostate state is probably a convergent trait, or a trait that may have evolved independently in acrocarpous and pleurocarpous moss lineages in response to similar selective pressures. Still, it remains unclear what such selective pressures may have been, as the paleoclimates and habitats that hosted the tricostate mosses are not well circumscribed, precluding comparisons among the different species and their closest analogs among living multicostate mosses.
研究的前提。早白垩世(Valanginian)的岩石暴露在苹果湾(温哥华岛,加拿大)已经产生了许多解剖学上保存的苔藓植物,扩大了我们对这一群体的前新生代化石记录的认识。来自苹果湾的一种具有三毛状叶片的苔藓新类型结合了以前记录的苔藓物种中没有遇到的特征,保证了对新分类单元的深入表征。方法。采用醋酸纤维素剥离技术对含过矿化化石物质的碳酸盐结核进行了切片。由此产生的醋酸盐剥皮提供了通过苔藓植物标本的连续切片,用于在二维和三维空间重建植物及其叶片的习性。关键的结果。本文描述了一种藓科藓属植物Tricosta priapiana sp. nov.,该新种的解剖和形态特征证明了在Tricosta科和Tricosta的诊断上有进一步的扩展和完善,特别是在枝周分支和枝芽形态方面。枝条芽周围的假葡萄球菌的存在支持了先前提出的三角菌科的胸膜类亲缘关系。结论。Tricosta priapiana增加了tricostate苔藓的多样性,这是一种在中生代已经灭绝的物种,具有有趣的多样性。然而,三角体状态可能是一种趋同的特征,或者是一种特征,可能是为了响应类似的选择压力而独立进化而来的。尽管如此,人们仍然不清楚这种选择压力可能是什么,因为寄生于三态苔藓的古气候和栖息地并没有很好地界定,这就排除了对不同物种及其在多态苔藓中最接近的类似物的比较。
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引用次数: 0
Relative energetic economy of cleistogamous selfing in three populations of the perennial Ruellia humilis 多年生毛豆三个居群闭合花自交的相对能量经济
3区 生物学 Q3 PLANT SCIENCES Pub Date : 2023-08-16 DOI: 10.1086/727456
Tatyana Y. Soto, Nicholas A. Ryan, Christopher G Oakley
Previous articleNext article No AccessRelative energetic economy of cleistogamous selfing in three populations of the perennial Ruellia humilisTatyana Y. Soto, Nicholas A. Ryan, and Christopher G OakleyTatyana Y. Soto Search for more articles by this author , Nicholas A. Ryan Search for more articles by this author , and Christopher G Oakley Search for more articles by this author PDFPDF PLUS Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmailPrint SectionsMoreDetailsFiguresReferencesCited by International Journal of Plant Sciences Just Accepted Article DOIhttps://doi.org/10.1086/727456 Views: 6Total views on this site HistoryAccepted August 15, 2023 © 2023 The University of Chicago. All Rights reserved.PDF download Crossref reports no articles citing this article.
上一篇文章下一篇文章无法访问多年生草本植物Ruellia humilia istatyana Y. Soto, Nicholas A. Ryan和Christopher G . OakleyTatyana Y. Soto的闭锁自交的相对能量经济和Christopher G Oakley搜索本作者的更多文章PDFPDF PLUS添加到收藏夹下载CitationTrack citationspermissions转载分享在facebook twitter linkedinredditemailprint sectionsmoredetailsfigures参考文献引用国际植物科学杂志刚刚接受文章DOIhttps://doi.org/10.1086/727456浏览次数:6本网站总访问量历史接受2023年8月15日©2023芝加哥大学。Crossref报告没有引用这篇文章的文章。
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引用次数: 1
First Cenozoic macrofossil record of Polypodiaceae from India, and its biogeographic implications 印度水蛭科首次新生代大化石记录及其生物地理意义
IF 2.3 3区 生物学 Q3 PLANT SCIENCES Pub Date : 2023-08-16 DOI: 10.1086/727457
Sampa Kundu, Taposhi Hazra, T. Chakraborty, S. Bera, S. Taral, M. Khan
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引用次数: 0
Cycadodendron galtieri gen. nov. et sp. nov. - A lower Permian gymnosperm stem with cycadalean affinity 苏铁(Cycadodendron galtieri gen. 11 . et sp. 11 .) -一个具有苏铁亲缘关系的低二叠纪裸子植物茎
IF 2.3 3区 生物学 Q3 PLANT SCIENCES Pub Date : 2023-08-16 DOI: 10.1086/727458
Ludwig Luthardt, R. Roessler, D. Stevenson
Premise of research. In our modern flora, the Cycadales represent one of the oldest-known gymnosperm clades, with their evolutionary roots tracing back to the late Paleozoic. Their radiation and wide distribution in the Mesozoic are well documented by numerous fossils. In contrast, the fossil record of late Paleozoic forms is restricted to a few specimens, thus leaving open questions on the origin and early evolution of cycads. A petrified stem with cycadalean affinity has been found in Saxony (central-eastern Germany) in Holocene gravel deposits of the Zwickauer Mulde river as a result of fluvial transportation from its original lower Permian locality. Methodology. The specimen was sectioned transversely, radially, and tangentially. Its provenance was clarified by comparing fossil woods of various localities in the upstream catchment area. Samples of these localities were exposed to ultraviolet light of different wavelengths, revealing distinctive fluorescence patterns related to specific geochemical conditions during the fossilization process. Plant anatomical studies were performed by macroscopic and microscopic documentation, including photo scanning, microscopic photography, and anatomical measurements. Pivotal results. Cycadodendron galtieri gen. nov. et sp. nov. originates from the Chemnitz Fossil Lagerstätte, an autochthonous floral assemblage of early Permian age (291 Ma; Sakmarian–Artinskian) that has been buried and conserved by pyroclastics in a geological instant. Several anatomical characteristics provide evidence for its cycadalean affinity: (1) a wide pith with numerous scattered medullary bundles, (2) a pith-peripheral vascular system with endarch primary xylem bundles, (3) at least nine successive vascular segments with secondary xylem and phloem, (4) araucarioid-type pitting of secondary xylem tracheids, and (5) primary rays and medullary bundles traversing the vascular segments. Conclusions. Cycadodendron galtieri gen. nov. et sp. nov. provides insights into stem anatomical characteristics of the oldest-known cycads, for example, revealing that polyxyly was an early-derived feature in cycad evolution. Its provenance reveals that the arborescent but generally small taxon was part of intramontane forested landscapes thriving on a well-drained mineral substrate in an alluvial plain setting and experiencing seasonally dry paleoclimate.
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引用次数: 0
Earliest fossil record of Burseraceae from the Deccan Intertrappean Beds of Central India and its biogeographic implications 印度中部德干地层中最早的刺蕨科化石记录及其生物地理意义
IF 2.3 3区 生物学 Q3 PLANT SCIENCES Pub Date : 2023-07-05 DOI: 10.1086/726627
Sanchita Kumar, S. Manchester, W. Judd, M. Khan
Premise of research. Burseraceae is represented by a large number of fossils from the Cenozoic sedimentary succession and has a disjunct distribution today in the southern part of North America, Africa, Europe, and Asia. However, the family has a poor fossil record in deep time, making hypotheses concerning its origin and dispersal difficult to evaluate. Here, we report the occurrence of reproductive organs (fruit and flower) attributable to modern Burseraceae from the probable latest Maastrichtian (Late Cretaceous) to earliest Danian (early Paleocene) sediments of the Mandla Lobe of the Deccan Intertrappean beds of Madhya Pradesh, Central India. Methodology. X-ray micro–computed tomography was used to observe three-dimensional structures. The reconstruction software takes the 2D projection images acquired by the X-ray detector and generates a 3D image represented by gray values distributed in a volumetric space. The present fruit and flower fossils are identified through morphological comparison with another fossil and extant Burseraceae. Pivotal results. The fossil pyrene corresponds in morphology with that of Burseraceae (particularly some genera of Protieae and Bursereae), while the fossil flower, with the pentamerous organization of sepals and petals and ovary and 10 stamens arranged in two whorls around a prominent intrastaminal nectary disk, is particularly similar to Protium. The fossil fruit is here described as a new species of the fossil genus Bursericarpum Reid et Chandler as Bursericarpum indicum Kumar, Manchester et Khan sp. nov. and the fossil flower as Debursera indica Kumar, Manchester, Judd et Khan sp. nov. Conclusions. The present discoveries represent the oldest reliable fossil records of Burseraceae supporting its Gondwanan origin. These fossils also provide important information for tracing possible migration pathways of Burseraceae from India to Europe after the docking of the Indian subcontinent with Eurasia during the early Eocene (55±10 Ma), supporting an “out-of-India” dispersal hypothesis. Based on earlier and present records we suggest that the family might have reached Europe from India and then colonized North America (during the Eocene) in areas where it is now regionally extinct.
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引用次数: 0
The ecology of hybrid zone formation and maintenance in Impatiens 凤仙花杂交带形成与维持生态学
IF 2.3 3区 生物学 Q3 PLANT SCIENCES Pub Date : 2023-07-05 DOI: 10.1086/726626
Sneha S. Joshi, U. Kodandaramaiah
Premise of research. Narrow hybrid zones are maintained by the counteracting forces of selection and gene flow. Understanding the mechanisms of formation and maintenance of narrow hybrid zones helps elucidate the evolutionary forces shaping reproductive biology, distribution, and diversification. We studied the ecology of the hybrid zone of two Impatiens species, Impatiens rosea and Impatiens balsamina, and the causes of the hybrid zone’s restriction in space. Methodology. We characterized floral morphometry for the identification of hybrids and parents. To understand the selection on floral traits, we modeled and compared geographic clines of floral traits. We assessed the effect of environmental niche, local adaptation, reproductive niche, and hybrid fitness on maintaining the structure of the hybrid zone. We studied two hybridization sites, one with an altitudinal gradient (Mulshi) and one without (Dapoli), to test the importance of environmental gradients. Pivotal results. We found that pollination-related floral traits, the length of the nectar spur and the size and shape of the wing petal, differ strongly between the parental populations; that these traits are intermediate in hybrids; and that they form the steepest coincident clines across the hybrid zone. Abiotic environmental niche and hybrid fitness do not regulate the hybrid zone structure. Parental species and hybrids show overlapping pollinators but differ in visitation frequencies. Local adaptation for reproductive success influences hybridization only in the site with an altitudinal gradient. Conclusions. The hybrid zone structure and its influencing factors differ across hybridization sites with and without altitudinal gradient. Neither the tension zone model nor the environment-dependent selection model completely explain this hybrid zone. Pollinator-mediated selection on floral traits is important in maintaining the narrow hybrid zone structure. Ecological factors primarily responsible for lineage divergence are also most likely to govern the dynamics of hybridization of the lineages.
{"title":"The ecology of hybrid zone formation and maintenance in Impatiens","authors":"Sneha S. Joshi, U. Kodandaramaiah","doi":"10.1086/726626","DOIUrl":"https://doi.org/10.1086/726626","url":null,"abstract":"Premise of research. Narrow hybrid zones are maintained by the counteracting forces of selection and gene flow. Understanding the mechanisms of formation and maintenance of narrow hybrid zones helps elucidate the evolutionary forces shaping reproductive biology, distribution, and diversification. We studied the ecology of the hybrid zone of two Impatiens species, Impatiens rosea and Impatiens balsamina, and the causes of the hybrid zone’s restriction in space. Methodology. We characterized floral morphometry for the identification of hybrids and parents. To understand the selection on floral traits, we modeled and compared geographic clines of floral traits. We assessed the effect of environmental niche, local adaptation, reproductive niche, and hybrid fitness on maintaining the structure of the hybrid zone. We studied two hybridization sites, one with an altitudinal gradient (Mulshi) and one without (Dapoli), to test the importance of environmental gradients. Pivotal results. We found that pollination-related floral traits, the length of the nectar spur and the size and shape of the wing petal, differ strongly between the parental populations; that these traits are intermediate in hybrids; and that they form the steepest coincident clines across the hybrid zone. Abiotic environmental niche and hybrid fitness do not regulate the hybrid zone structure. Parental species and hybrids show overlapping pollinators but differ in visitation frequencies. Local adaptation for reproductive success influences hybridization only in the site with an altitudinal gradient. Conclusions. The hybrid zone structure and its influencing factors differ across hybridization sites with and without altitudinal gradient. Neither the tension zone model nor the environment-dependent selection model completely explain this hybrid zone. Pollinator-mediated selection on floral traits is important in maintaining the narrow hybrid zone structure. Ecological factors primarily responsible for lineage divergence are also most likely to govern the dynamics of hybridization of the lineages.","PeriodicalId":14306,"journal":{"name":"INTERNATIONAL JOURNAL OF PLANT SCIENCES","volume":"61 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84040654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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INTERNATIONAL JOURNAL OF PLANT SCIENCES
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