Unravelling proximate cues of mass flowering in the tropical forests of South-East Asia from gene expression analyses

Yeoh, S.H. and Satake, A. and Numata, S. and Ichie, T. and Lee, S.L. and Basherudin, N. and Muhammad, N. and Kondo, T. and Otani, T. and Hashim, M. and Tani, N. (2017) Unravelling proximate cues of mass flowering in the tropical forests of South-East Asia from gene expression analyses. Molecular Ecology, 26 (19). pp. 5074-5085. ISSN 0962-1083

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Official URL: http://dx.doi.org/10.1111/mec.14257

Abstract

Elucidating the physiological mechanisms of the irregular yet concerted flowering rhythm of mass flowering tree species in the tropics requires long-term monitoring of flowering phenology, exogenous and endogenous environmental factors, as well as identifying interactions and dependencies among these factors. To investigate the proximate factors for floral initiation of mast seeding trees in the tropics, we monitored the expression dynamics of two key flowering genes, meteorological conditions and endogenous resources over two flowering events of Shorea curtisii and Shorea leprosula in the Malay Peninsula. Comparisons of expression dynamics of genes studied indicated functional conservation of FLOWERING LOCUS T (FT) and LEAFY (LFY) in Shorea. The genes were highly expressed at least 1 month before anthesis for both species. A mathematical model considering the synergistic effect of cool temperature and drought on activation of the flowering gene was successful in predicting the observed gene expression patterns. Requirement of both cool temperature and drought for floral transition suggested by the model implies that flowering phenologies of these species are sensitive to climate change. Our molecular phenology approach in the tropics sheds light on the conserved role of flowering genes in plants inhabiting different climate zones and can be widely applied to dissect the flowering processes in other plant species.

Item Type: Article
Uncontrolled Keywords: Dipterocarpaceae; Drought; Gene expression; Low temperature; Mass flowering; Mathematical model
Subjects: Q Science > Q Science (General)
Q Science > QH Natural history
Divisions: Faculty of Science > Institute of Biological Sciences
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 30 Jul 2018 07:38
Last Modified: 30 Jul 2018 07:38
URI: http://eprints.um.edu.my/id/eprint/18939

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