Photoperiodic control of seasonal growth is mediated by ABA acting on cell-cell communication


Type
Article
Change log
Authors
Tylewicz, S 
Petterle, A 
Marttila, S 
Miskolczi, P 
Azeez, A 
Abstract

In temperate and boreal ecosystems, seasonal cycles of growth and dormancy allow perennial plants to adapt to winter conditions. We show, in hybrid aspen trees, that photoperiodic regulation of dormancy is mechanistically distinct from autumnal growth cessation. Dormancy sets in when symplastic intercellular communication through plasmodesmata is blocked by a process dependent on the phytohormone abscisic acid. The communication blockage prevents growth-promoting signals from accessing the meristem. Thus, precocious growth is disallowed during dormancy. The dormant period, which supports robust survival of the aspen tree in winter, is due to loss of access to growth-promoting signals.

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Journal Title
Science
Conference Name
Journal ISSN
0036-8075
1095-9203
Volume Title
360
Publisher
AAAS
Sponsorship
European Research Council (323052)
Gatsby Charitable Foundation (GAT3395/PR3)