Phytochrome B and PHYTOCHROME INTERACTING FACTOR8 modulate seasonal growth in trees
Phytochrome B and PHYTOCHROME INTERACTING FACTOR8 modulate seasonal growth in trees
复制标题
光敏色素 B 和 PHYTOCHROME 相互作用因子 8 调节树木的季节性生长
DOI：
10.1111/nph.17350
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发表时间：
2021-05-02
期刊：
影响因子：
9.4
通讯作者：
Nilsson, Ove
中科院分区：
文献类型：
--
作者：
Ding, Jihua;Zhang, Bo;Nilsson, Ove
光周期和温度是多年生植物适应寒带和温带生态系统的重要因素，植物光敏色素B（phyB）作为光、热传感器在拟南芥中得到了广泛的研究。然而，光敏色素光感受器如何控制树木的物候期的具体机制仍然知之甚少。我们的特点PHYB基因及其下游的光敏色素相互作用因子（PIF）的目标，在杂种白杨树的避荫和季节性生长的调节功能。我们发现，而phyB 1和phyB 2，在其他植物中的phyB，作为抑制剂的营养生长过程中的芽伸长，他们作为促进树的季节性生长。此外，虽然PIF 4和PIF 8的杨树同源物都参与了避荫综合征（SAS），但只有PIF 8作为季节性生长的抑制因子发挥着重要作用。我们的数据表明，PHYB-PIF 8调节子通过调节FT和CENL 1的表达来控制季节性生长，而全基因组转录组分析表明，在杨树中，phyB协调调节SAS反应和季节性生长停止。
The seasonally synchronized annual growth cycle that is regulated mainly by photoperiod and temperature cues is a crucial adaptive strategy for perennial plants in boreal and temperate ecosystems.Phytochrome B (phyB), as a light and thermal sensor, has been extensively studied in Arabidopsis. However, the specific mechanisms for how the phytochrome photoreceptors control the phenology in tree species remain poorly understood.We characterized the functions of PHYB genes and their downstream PHYTOCHROME INTERACTING FACTOR (PIF) targets in the regulation of shade avoidance and seasonal growth in hybrid aspen trees. We show that while phyB1 and phyB2, as phyB in other plants, act as suppressors of shoot elongation during vegetative growth, they act as promoters of tree seasonal growth. Furthermore, while the Populus homologs of both PIF4 and PIF8 are involved in the shade avoidance syndrome (SAS), only PIF8 plays a major role as a suppressor of seasonal growth.Our data suggest that the PHYB-PIF8 regulon controls seasonal growth through the regulation of FT and CENL1 expression while a genome-wide transcriptome analysis suggests how, in Populus trees, phyB coordinately regulates SAS responses and seasonal growth cessation.