Intrinsic factors controlling growth under sink limited conditions

库限制条件下控制生长的内在因素

基本信息

  • 批准号:
    RGPIN-2016-05933
  • 负责人:
  • 金额:
    $ 2.55万
  • 依托单位:
  • 依托单位国家:
    加拿大
  • 项目类别:
    Discovery Grants Program - Individual
  • 财政年份:
    2016
  • 资助国家:
    加拿大
  • 起止时间:
    2016-01-01 至 2017-12-31
  • 项目状态:
    已结题

项目摘要

Growth in plants is either limited by source activity (carbon fixation) or by the capacity of the sinks to use or store carbon. We still do not know exactly what limits growth in major sinks such as storage organs. In spring ephemerals, storage organ growth is mostly determined by cell size rather than by cell number, and these organs get larger when plants are grown at lower temperatures. We want to test the role plays by endoreduplication in determining cell size in these organs. The level of endoreduplication can be monitored by quantifying cell DNA content using flow cytometry. We will determine when endoreduplication takes place and how it is influenced by growth temperatures in different spring ephemerals and a few temperate storage crops such as beet and potato. We will then try to modulate the number of endoreduplication cycles by applying metabolites and phytohormones known to influence the cell cycle. Source and sink activities are continuously modulated to avoid disequilibrium. For example, under sink limitation, photosynthesis is downregulated, which can even lead to leaf senescence. However, so far no signaling pathway from sink to source has been conclusively confirmed. We have recently identified metabolites that could be involved in inducing leaf senescence under sink limited conditions in Erythronium americanum. We will now confirm their role as signaling molecules, using different approaches. First, we will prolong sink growth by delaying leaf senescence using phytohormones. This approach should allow us to separate the sink limitation signal from that of leaf senescence and identify metabolites specific to each process, using metabolomics. Second, we will compare leaf and bulb metabolite profiles at the onset of leaf senescence in both source and sink limited plants of the same species. We will use wild leek of different ages, as we have recently found that growth is source limited in seedlings, and gradually becomes sink limited as plant ages. Third, we will compare metabolite profiles of spring ephemeral species from different taxonomic families to determine how widespread these sink limited signaling molecules are. This study will help us understand why plants have evolved to senesce their leaves under sink limited conditions, even though this reduces total plant growth capacity. Identifying the signaling molecules involved is an important step toward answering this question, but also if we attempt to delay leaf senescence and improve growth in sink limited species. This study will also characterize the role played by endoreduplication in determining final cell size in storage organs of many temperate species which will improve our comprehension of the factors that limit sink growth and thus yield. Two Ph.D., one master’s, and 5 B.Sc. students will gain expertise in whole-plant source-sink studies and in functional metabolomics during the 5 years of the project.
植物的生长要么受到碳源活动(碳固定)的限制,要么受到碳汇利用或储存碳的能力的限制。我们仍然不知道究竟是什么限制了诸如储存器官等主要汇的生长。在春季植物中,储存器官的生长主要是由细胞大小而不是细胞数量决定的,当植物在较低的温度下生长时,这些器官会变大。我们想测试内复制在决定这些器官中细胞大小的作用。通过流式细胞术定量测定细胞DNA含量,可以监测细胞内复制的水平。我们将确定何时发生内复制,以及它如何受到生长温度的影响,在不同的春季短暂性作物和一些温带储存作物,如甜菜和土豆。然后,我们将尝试通过应用已知影响细胞周期的代谢物和植物激素来调节内复制周期的数量。

项目成果

期刊论文数量(0)
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会议论文数量(0)
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Lapointe, Line其他文献

IMPACT OF GROWTH FORM AND CARBOHYDRATE RESERVES ON TOLERANCE TO SIMULATED DEER HERBIVORY AND SUBSEQUENT RECOVERY IN LILIACEAE
  • DOI:
    10.3732/ajb.0900200
  • 发表时间:
    2010-06-01
  • 期刊:
  • 影响因子:
    3
  • 作者:
    Lapointe, Line;Bussieres, Julie;Ouellet, Jean-Pierre
  • 通讯作者:
    Ouellet, Jean-Pierre
Invader disruption of belowground plant mutualisms reduces carbon acquisition and alters allocation patterns in a native forest herb
  • DOI:
    10.1111/nph.13709
  • 发表时间:
    2016-01-01
  • 期刊:
  • 影响因子:
    9.4
  • 作者:
    Hale, Alison N.;Lapointe, Line;Kalisz, Susan
  • 通讯作者:
    Kalisz, Susan
Late canopy closure delays senescence and promotes growth of the spring ephemeral wild leek (Allium tricoccum)
  • DOI:
    10.1139/cjb-2016-0317
  • 发表时间:
    2017-05-01
  • 期刊:
  • 影响因子:
    1.1
  • 作者:
    Dion, Pierre-Paul;Bussieres, Julie;Lapointe, Line
  • 通讯作者:
    Lapointe, Line
Carbon Dioxide Enrichment Does Not Reduce Leaf Longevity or Alter Accumulation of Carbon Reserves in the Woodland Spring Ephemeral Erythronium americanum
  • DOI:
    10.1093/aob/mcn161
  • 发表时间:
    2008-11-01
  • 期刊:
  • 影响因子:
    4.2
  • 作者:
    Gutjahr, Sylvain;Lapointe, Line
  • 通讯作者:
    Lapointe, Line
Cooler temperatures favour growth of wild leek (Allium tricoccum), a deciduous forest spring ephemeral
  • DOI:
    10.1139/b2012-089
  • 发表时间:
    2012-11-01
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Bernatchez, Antoine;Lapointe, Line
  • 通讯作者:
    Lapointe, Line

Lapointe, Line的其他文献

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{{ truncateString('Lapointe, Line', 18)}}的其他基金

Intrinsic factors controlling growth under sink limited conditions
库限制条件下控制生长的内在因素
  • 批准号:
    RGPIN-2016-05933
  • 财政年份:
    2021
  • 资助金额:
    $ 2.55万
  • 项目类别:
    Discovery Grants Program - Individual
Intrinsic factors controlling growth under sink limited conditions
库限制条件下控制生长的内在因素
  • 批准号:
    RGPIN-2016-05933
  • 财政年份:
    2020
  • 资助金额:
    $ 2.55万
  • 项目类别:
    Discovery Grants Program - Individual
Intrinsic factors controlling growth under sink limited conditions
库限制条件下控制生长的内在因素
  • 批准号:
    RGPIN-2016-05933
  • 财政年份:
    2019
  • 资助金额:
    $ 2.55万
  • 项目类别:
    Discovery Grants Program - Individual
Intrinsic factors controlling growth under sink limited conditions
库限制条件下控制生长的内在因素
  • 批准号:
    RGPIN-2016-05933
  • 财政年份:
    2018
  • 资助金额:
    $ 2.55万
  • 项目类别:
    Discovery Grants Program - Individual
Intrinsic factors controlling growth under sink limited conditions
库限制条件下控制生长的内在因素
  • 批准号:
    RGPIN-2016-05933
  • 财政年份:
    2017
  • 资助金额:
    $ 2.55万
  • 项目类别:
    Discovery Grants Program - Individual
Carbon metabolism in sink limited conditions
库有限条件下的碳代谢
  • 批准号:
    138845-2010
  • 财政年份:
    2015
  • 资助金额:
    $ 2.55万
  • 项目类别:
    Discovery Grants Program - Individual
Amélioration des conditions de culture du safran en serres et sous conditions contrôlées
赛峰文化条件改善及控制条件
  • 批准号:
    489262-2015
  • 财政年份:
    2015
  • 资助金额:
    $ 2.55万
  • 项目类别:
    Engage Grants Program
Carbon metabolism in sink limited conditions
库有限条件下的碳代谢
  • 批准号:
    138845-2010
  • 财政年份:
    2014
  • 资助金额:
    $ 2.55万
  • 项目类别:
    Discovery Grants Program - Individual
Carbon metabolism in sink limited conditions
库有限条件下的碳代谢
  • 批准号:
    138845-2010
  • 财政年份:
    2013
  • 资助金额:
    $ 2.55万
  • 项目类别:
    Discovery Grants Program - Individual
Carbon metabolism in sink limited conditions
库有限条件下的碳代谢
  • 批准号:
    138845-2010
  • 财政年份:
    2012
  • 资助金额:
    $ 2.55万
  • 项目类别:
    Discovery Grants Program - Individual

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