期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2019
卷号：116
期号：22
页码：10852-10857
DOI：10.1073/pnas.1902199116
出版社：The National Academy of Sciences of the United States of America
摘要：In perennial plants, seasonal shifts provide cues that control adaptive growth patterns of the shoot apex. However, where these seasonal cues are sensed and communicated to the shoot apex remains unknown. We demonstrate that systemic signals from leaves play key roles in seasonal control of shoot growth in model tree hybrid aspen. Grafting experiments reveal that the tree ortholog of Arabidopsis flowering time regulator FLOWERING LOCUS T ( FT ) and the plant hormone gibberellic acid (GA) systemically convey seasonal cues to the shoot apex. GA (unlike FT ) also acts locally in shoot apex, downstream of FT in seasonal growth control. At the shoot apex, antagonistic factors— LAP1 , a target of FT and the FT antagonist TERMINAL FLOWER 1 ( TFL1 )—act locally to promote and suppress seasonal growth, respectively. These data reveal seasonal changes perceived in leaves that are communicated to the shoot apex by systemic signals that, in concert with locally acting components, control adaptive growth patterns.
关键词：systemic signal ; photoperiodic ; FLOWERING LOCUS T ; gibberellic acid ; hybrid aspen
