Response to Crowding and Vegetation Shade in Impatiens capensis: Genetic Variation and Fitness Consequences

凤仙花对拥挤和植被遮荫的反应:遗传变异和适应性后果

基本信息

  • 批准号:
    9708114
  • 负责人:
  • 金额:
    $ 9万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    1997
  • 资助国家:
    美国
  • 起止时间:
    1997-08-15 至 1999-07-31
  • 项目状态:
    已结题

项目摘要

9708114 Schmitt Many plant species exhibit characteristic morphological responses to crowding and vegetation shade, such as stem elongation and reduced branching. This "shade avoidance response" is cued by a reduction in the ratio of red to far-red wavelengths (R:FR) in light transmitted or reflected from green vegetation; this R:FR signal is perceived by light-sensing molecules called phytochromes. It has been hypothesized that phytochrome-mediated shade avoidance responses are beneficial to plants by enabling them to anticipate and avoid competition for light in dense stands. Recent results from this project strongly support this hypothesis. In a field experiment, stem elongation increased the reproduction of the common annual Impatiens capensis in dense stands, but plants induced to display the shade avoidance response at low density suffered reduced fitness relative to nonelongated plants, apparently due to an unmeasured physiological cost. The goals of the proposed research are to examine the genetic basis of the shade avoidance response and potential mechanisms for selection on the response in the field, and to test for physiological, ecological, and genetic costs of the response. Replicated inbred lines differing in the magnitude of morphological response to R:FR will be planted into a natural population at manipulated densities and group compositions to study the level at which selection acts on shade avoidance traits. Elongated and nonelongated seedlings will be grown under different levels of water and nutrients, to determine the conditions under which shade avoidance traits may be costly. This research will integrate genetic, physiological, and population biology approaches to the study of phytochrome-mediated shade avoidance responses in plants. It will provide important insights into the role of these responses in natural populations. The results will also provide an ecological and evolutionary context for current research by plant molecular biolog ists and developmental biologists on the underlying genetic basis for plant responses to light. Since most crops are grown in dense stands, this study will also provide insight into possible selection strategies for improvement of agricultural yields.
许多植物对拥挤和植被遮荫表现出特有的形态响应,如茎伸长和分枝减少。这种“避影反应”是由绿色植被透射或反射的光中红光与远红光波长之比(R:FR)的减少引起的;这种R:FR信号被称为光敏色素的光敏分子感知。据推测,光敏色素介导的避荫反应对植物是有益的,使它们能够预测和避免在茂密的林分中对光的竞争。该项目的最新结果有力地支持了这一假设。在田间试验中,茎长增加了密集林分中常见一年生凤仙花(Impatiens capensis)的繁殖,但在低密度下表现出遮荫回避反应的植株的适合度相对于非伸长的植株降低,这显然是由于未测量的生理成本。本研究的目的是研究避荫反应的遗传基础和田间选择避荫反应的潜在机制,并测试避荫反应的生理、生态和遗传成本。将对R:FR有不同形态响应程度的复制自交系,在控制密度和群体组成的条件下种植到一个自然群体中,研究选择在何种程度上对避荫性状起作用。细长和非细长的幼苗将在不同的水分和养分水平下生长,以确定在哪些条件下避荫性状可能是昂贵的。本研究将整合遗传学、生理学和种群生物学的方法来研究植物中光敏色素介导的避荫反应。它将为了解这些反应在自然种群中的作用提供重要见解。该研究结果还将为植物分子生物学家和发育生物学家目前对植物对光反应的潜在遗传基础的研究提供生态和进化背景。由于大多数作物生长在密集的林分中,这项研究也将为提高农业产量的可能选择策略提供见解。

项目成果

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Johanna Schmitt其他文献

Population differentiation and genetic variation inform translocation decisions for <em>Liatris scariosa</em> var. <em>novae</em>-<em>angliae</em>, a rare New England grassland perennial
  • DOI:
    10.1016/j.biocon.2005.01.021
  • 发表时间:
    2005-07-01
  • 期刊:
  • 影响因子:
  • 作者:
    Kelly Gravuer;Eric von Wettberg;Johanna Schmitt
  • 通讯作者:
    Johanna Schmitt
Geographic and seasonal variation in emδ/emsup13/supC values of Csub3/sub plant emarabidopsis/em: Archaeological implications
C3 植物拟南芥的 emδ/emsup13/supC 值的地理和季节变化:考古学意义
  • DOI:
    10.1016/j.jas.2022.105709
  • 发表时间:
    2023-01-01
  • 期刊:
  • 影响因子:
    2.500
  • 作者:
    Catherine G. Cooper;Martha D. Cooper;Michael P. Richards;Johanna Schmitt
  • 通讯作者:
    Johanna Schmitt
Pinoresinol and matairesinol accumulation in a Forsythia × intermedia cell suspension culture
  • DOI:
    10.1023/a:1012909131741
  • 发表时间:
    2002-01-01
  • 期刊:
  • 影响因子:
    2.400
  • 作者:
    Johanna Schmitt;Maike Petersen
  • 通讯作者:
    Maike Petersen
Maternal Effects of Drought Stress and Inbreeding in Impatiens capensis
干旱胁迫和凤仙花近交对母体的影响
  • DOI:
  • 发表时间:
    2000
  • 期刊:
  • 影响因子:
    0
  • 作者:
    C. Riginos;M. S. Heschel;Johanna Schmitt
  • 通讯作者:
    Johanna Schmitt
Aortic valve stenosis and osteoporosis: insights from a mouse model
  • DOI:
    10.1186/s12872-025-05037-4
  • 发表时间:
    2025-07-31
  • 期刊:
  • 影响因子:
    2.300
  • 作者:
    Hannah Billig;Johanna Schmitt;Lamia Singer;Christoph Bourauel;Frank A. Schildberg;Werner Masson;Nikola Lübbering;Wenzel Vogel;Sven Perner;Marta Stei;Sven Niepmann;Miriam Silaschi;Farhad Bakhtiary;Georg Nickenig;Sebastian Zimmer
  • 通讯作者:
    Sebastian Zimmer

Johanna Schmitt的其他文献

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{{ truncateString('Johanna Schmitt', 18)}}的其他基金

OPUS: Synthesizing field data in a genomic context to elucidate the evolution of phenotypic plasticity and local adaptation
OPUS:在基因组背景下综合现场数据,以阐明表型可塑性和局部适应的进化
  • 批准号:
    1754102
  • 财政年份:
    2018
  • 资助金额:
    $ 9万
  • 项目类别:
    Standard Grant
Collaborative Research: Integrating Genetically Informed Models of Germination and Flowering to Predict Life History Responses to Changing Climate
合作研究:整合发芽和开花的遗传信息模型来预测生命史对气候变化的反应
  • 批准号:
    1447203
  • 财政年份:
    2014
  • 资助金额:
    $ 9万
  • 项目类别:
    Continuing Grant
Collaborative Research: Integrating Genetically Informed Models of Germination and Flowering to Predict Life History Responses to Changing Climate
合作研究:整合发芽和开花的遗传信息模型来预测生命史对气候变化的反应
  • 批准号:
    1020111
  • 财政年份:
    2010
  • 资助金额:
    $ 9万
  • 项目类别:
    Continuing Grant
LiT: Life History Responses to Genetic and Environmental Perturbations in Arabidopsis thaliana
LiT:拟南芥生活史对遗传和环境扰动的反应
  • 批准号:
    0924059
  • 财政年份:
    2009
  • 资助金额:
    $ 9万
  • 项目类别:
    Continuing Grant
FIBR - Molecular Evolutionary Ecology of Developmental Signaling Pathways in Complex Environments.
FIBR - 复杂环境中发育信号通路的分子进化生态学。
  • 批准号:
    0425759
  • 财政年份:
    2004
  • 资助金额:
    $ 9万
  • 项目类别:
    Continuing Grant
Dissertation Research - Local Adaptation and Landscape Genetics of Plastic Shade Avoidance Responses in Impatiens capensis.
论文研究 - 凤仙花塑料避荫反应的局部适应和景观遗传学。
  • 批准号:
    0408015
  • 财政年份:
    2004
  • 资助金额:
    $ 9万
  • 项目类别:
    Standard Grant
ABR: Response to Crowding and Vegetation Shade in Impatiens capensis: Genetic Basis and Fitness Consequences
ABR:凤仙花对拥挤和植被遮荫的反应:遗传基础和适应性后果
  • 批准号:
    0129018
  • 财政年份:
    2002
  • 资助金额:
    $ 9万
  • 项目类别:
    Standard Grant
Response to Crowding and Vegetation Shade in Impatiens capensis: Genetic Variation and Fitness Consequences
凤仙花对拥挤和植被遮荫的反应:遗传变异和适应性后果
  • 批准号:
    9806858
  • 财政年份:
    1998
  • 资助金额:
    $ 9万
  • 项目类别:
    Continuing Grant
Collaborative Research: Ecological Genetics of Response to Light in Arabidopsis thaliana (Brassicaceae)
合作研究:拟南芥(十字花科)光反应的生态遗传学
  • 批准号:
    9509239
  • 财政年份:
    1995
  • 资助金额:
    $ 9万
  • 项目类别:
    Standard Grant
Response to Crowding and Vegetation Shade in Impatiens capensis: Genetic Variation and Fitness Consequences
凤仙花对拥挤和植被遮荫的反应:遗传变异和适应性后果
  • 批准号:
    9306637
  • 财政年份:
    1993
  • 资助金额:
    $ 9万
  • 项目类别:
    Continuing Grant

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NSF-BSF:体外和细胞内的大分子拥挤
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Crowding and Confinement: Coupling of Bulk and Membrane Phase Separation in Giant Vesicles
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