A Conserved Carbon Starvation Response Underlies Bud Dormancy in Woody and Herbaceous Species.
A Conserved Carbon Starvation Response Underlies Bud Dormancy in Woody and Herbaceous Species.
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DOI：
10.3389/fpls.2017.00788
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发表时间：
2017
影响因子：
5.6
通讯作者：
Cubas P
中科院分区：
文献类型：
--
作者：
Tarancón C;González-Grandío E;Oliveros JC;Nicolas M;Cubas P
植物芽系统产生了典型的地上植物结构。芽由腋生分生组织和芽形成，其生长发育受系统和局部信号的调节。这些线索传达了养分和水分的可用性、光照质量、汇源器官活动和其他变量的信息，这些变量决定了保持新芽发育的及时性和能力。这些信息在分生组织和芽中转化为生长或静止的局部反应。虽然已经确定了一些参与芽潜伏期发生的关键基因，但这些基因控制的基因调控网络（grn）尚未得到很好的定义。此外，目前还不确定由环境因素（如低红光与远红光比）诱导的芽休眠是否与其他原因（如顶端优势或短日照周期）诱导的芽休眠具有相同的遗传机制。此外，这些grn在被子植物中的进化和保护还没有很好的确定。我们重新分析了公开的转录组数据集，这些数据集比较了拟南芥静止和活跃的腋芽，以及木本植物葡萄（Vitis vinifera）的腋芽和杨树（Populus tremula x Populus alba）在芽生长到休眠过渡期间的顶芽数据集。我们的目的是确定在导致芽准休眠、生态休眠和内胚层休眠的过程中诱导的潜在的共同grn。在进入生态或矛盾状态的拟南芥芽中，我们已经确定了四种诱导的相关grn，它们对应于碳(C)饥饿综合征，这是低碳供应组织的典型症状。这种反应在杨树和葡萄藤芽进入休眠前和休眠期间也可以检测到。在所有真核生物中，c限制条件与生长停滞和潜伏相结合，就像在休眠的腋芽中观察到的那样。因此，芽休眠可能部分是潜在的C饥饿综合征的结果，由环境和内源性线索引发，这些线索预测或发出不利于芽持续生长的条件。
Plant shoot systems give rise to characteristic above-ground plant architectures. Shoots are formed from axillary meristems and buds, whose growth and development is modulated by systemic and local signals. These cues convey information about nutrient and water availability, light quality, sink/source organ activity and other variables that determine the timeliness and competence to maintain development of new shoots. This information is translated into a local response, in meristems and buds, of growth or quiescence. Although some key genes involved in the onset of bud latency have been identified, the gene regulatory networks (GRNs) controlled by these genes are not well defined. Moreover, it has not been determined whether bud dormancy induced by environmental cues, such as a low red-to-far-red light ratio, shares genetic mechanisms with bud latency induced by other causes, such as apical dominance or a short-day photoperiod. Furthermore, the evolution and conservation of these GRNs throughout angiosperms is not well established. We have reanalyzed public transcriptomic datasets that compare quiescent and active axillary buds of Arabidopsis, with datasets of axillary buds of the woody species Vitis vinifera (grapevine) and apical buds of Populus tremula x Populus alba (poplar) during the bud growth-to-dormancy transition. Our aim was to identify potentially common GRNs induced during the process that leads to bud para-, eco- and endodormancy. In Arabidopsis buds that are entering eco- or paradormancy, we have identified four induced interrelated GRNs that correspond to a carbon (C) starvation syndrome, typical of tissues undergoing low C supply. This response is also detectable in poplar and grapevine buds before and during the transition to dormancy. In all eukaryotes, C-limiting conditions are coupled to growth arrest and latency like that observed in dormant axillary buds. Bud dormancy might thus be partly a consequence of the underlying C starvation syndrome triggered by environmental and endogenous cues that anticipate or signal conditions unfavorable for sustained shoot growth.