Metabolite signature during short-day induced growth cessation in Populus

Frontiers in Plant Science

Miyako eKusano¹  Atsushi eFukushima¹  Jonas eGullberg²  Thomas eMoritz²  Pär eJonsson³  Michael eSjöström³  Johan eTrygg³ 

[1]RIKEN Plant Science Center

[2]Umeå Plant Science Centre/Swedish University of Agricultural Sciences

[3]Umeå University

关键词: Phytochrome A;    aspen;    GC-TOF-MS;    growth cessation;    metabolite profiling;   

DOI  :  10.3389/fpls.2011.00029

来源: DOAJ

【 摘 要 】

The photoperiod is an important environmental signal for plants, and influences a wide range of physiological processes. For woody species in northern latitudes, cessation of growth is induced by short photoperiods. In many plant species, short photoperiods stop elongational growth after a few weeks. It is known that plant daylength detection is mediated by Phytochrome A (PHYA) in the woody hybrid aspen species. However, the mechanism of dormancy involving primary metabolism remains unclear. We studied changes in metabolite profiles in hybrid aspen leaves (young, middle and mature leaves) during short-day induced growth cessation, using a combination of gas chromatography–time-of-flight mass spectrometry, and multivariate projection methods. Our results indicate that the metabolite profiles in mature source leaves rapidly change when the photoperiod changes. In contrast, the differences in young sink leaves grown under long and short day conditions are less distinct. We found short daylength induced growth cessation in aspen was associated with rapid changes in the distribution and levels of diverse primary metabolites. In addition, we conducted metabolite profiling of leaves of PHYA overexpressor (PHYAOX) and those of the control to find the discriminative metabolites between PHYAOX and the control under the short-day conditions. The metabolite changes observed in PHYAOX leaves, together with those in the source leaves, identified possible candidates for the metabolite signature (e.g., 2-oxo-glutarate, spermidine, putrescine, 4-amino-butyrate and tryptophan) during short-day induced growth cessation in aspen leaves.

【 授权许可】

Unknown