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首页> 美国卫生研究院文献>Plant Physiology >Components Acting Downstream of Short Day Perception Regulate Differential Cessation of Cambial Activity and Associated Responses in Early and Late Clones of Hybrid Poplar
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Components Acting Downstream of Short Day Perception Regulate Differential Cessation of Cambial Activity and Associated Responses in Early and Late Clones of Hybrid Poplar

机译：短日知觉下游起作用的成分调节杂种杨早期和晚期无性系的冈比亚活动的差异停止和相关的响应。

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Short days (SDs) in autumn induce growth cessation, bud set, cold acclimation, and dormancy in trees of boreal and temperate forests, and these responses occur earlier in northern than in southern genotypes. Nevertheless, we know little about whether this variation results from differential perception of SDs or differential downstream responses to the SD signal or a combination of the two. We compared global patterns of SD-regulated gene expression in the stems of hybrid poplar (Populus trichocarpa × Populus deltoides) clones that differ in their SD-induced growth cessation in order to address this question. The timing of cessation of cambial cell division caused by SDs differed between the clones and was coincident with the change in the pattern of expression of the auxin-regulated genes. The clones also differed in the timing of their SD-regulated changes in the transcript abundance of genes associated with cold tolerance, starch breakdown, and storage protein accumulation. By analyzing the expression of homologs of FLOWERING LOCUS T, we demonstrated that the clones differed little in their perception of SDs under the growth conditions applied but differed substantially in the downstream responses manifested in the timing and magnitude of gene expression after SD treatment. These results demonstrate the existence of factors that act downstream of SD perception and can contribute to variation in SD-regulated adaptive photoperiodic responses in trees.
机译：秋季的短日（SD）导致北方和温带森林树木的生长停止，芽集，寒冷适应和休眠，并且这些反应在北部比南部基因型更早发生。然而，我们几乎不知道这种变化是由对SD的不同感知还是对SD信号的不同下游响应还是两者的结合所导致的。为了解决这个问题，我们比较了SD调控基因在杂种杨（Populus trichocarpa×Populus deltoides）的茎中的基因表达的全球模式，这些杂种在其SD诱导的生长停止方面有所不同。在两个克隆之间，由SD引起的停止冈比亚细胞分裂的时机有所不同，并且与生长素调节基因表达模式的变化相吻合。这些克隆的SD调节基因的转录丰度变化的时间也不同，这些基因与耐寒性，淀粉分解和贮藏蛋白积累相关。通过分析FLOWERING LOCUS T的同源物的表达，我们证明了这些克隆在所应用的生长条件下对SD的感知几乎没有差异，但是在SD处理后基因表达的时间和大小上所表现出的下游反应却存在显着差异。这些结果证明了存在于SD感知下游的因素的存在，这些因素可能有助于树木中SD调节的自适应光周期响应的变化。

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