Potent induction of Arabidopsis thaliana flowering by elevated growth temperature

Balasubramanian, Sureshkumar, Sureshkumar, Sridevi, Lempe, Janne and Weigel, Detlef (2006) Potent induction of Arabidopsis thaliana flowering by elevated growth temperature. PLoS Genetics, 2 7: e106.0980-e106.0989. doi:10.1371/journal.pgen.0020106


Author Balasubramanian, Sureshkumar
Sureshkumar, Sridevi
Lempe, Janne
Weigel, Detlef
Title Potent induction of Arabidopsis thaliana flowering by elevated growth temperature
Formatted title
Potent induction of Arabidopsis thaliana flowering by elevated growth temperature
Journal name PLoS Genetics   Check publisher's open access policy
ISSN 1553-7390
1553-7404
Publication date 2006-07
Sub-type Article (original research)
DOI 10.1371/journal.pgen.0020106
Open Access Status DOI
Volume 2
Issue 7
Start page e106.0980
End page e106.0989
Total pages 10
Place of publication San Francisco, CA, U.S.A.
Publisher Public Library of Science
Language eng
Formatted abstract
The transition to flowering is an important event in the plant life cycle and is modulated by several environmental factors including photoperiod, light quality, vernalization, and growth temperature, as well as biotic and abiotic stresses. In contrast to light and vernalization, little is known about the pathways that mediate the responses to other environmental variables. A mild increase in growth temperature, from 23 °C to 27 °C, is equally efficient in inducing flowering of Arabidopsis plants grown in 8-h short days as is transfer to 16-h long days. There is extensive natural variation in this response, and we identify strains with contrasting thermal reaction norms. Exploiting this natural variation, we show that FLOWERING LOCUS C potently suppresses thermal induction, and that the closely related floral repressor FLOWERING LOCUS M is a major-effect quantitative trait locus modulating thermosensitivity. Thermal induction does not require the photoperiod effector CONSTANS, acts upstream of the floral integrator FLOWERING LOCUS T, and depends on the hormone gibberellin. Analysis of mutants defective in salicylic acid biosynthesis suggests that thermal induction is independent of previously identified stress-signaling pathways. Microarray analyses confirm that the genomic responses to floral induction by photoperiod and temperature differ. Furthermore, we report that gene products that participate in RNA splicing are specifically affected by thermal induction. Above a critical threshold, even small changes in temperature can act as cues for the induction of flowering. This response has a genetic basis that is distinct from the known genetic pathways of floral transition, and appears to correlate with changes in RNA processing.

Synopsis: When to flower is an important decision in the life cycle of a plant, as it determines the plant's reproductive success. Not surprisingly, plants closely monitor the state of their life cycle along with the external environment in order to determine the onset of flowering. Several factors including light, temperature, and abiotic stress are known to affect the timing of flowering. The authors show that growth temperatures above a finely tuned threshold can rapidly trigger flowering, bypassing the need for other inductive stimuli such as day length. Exploiting a combination of Mendelian genetics, natural variation, and genomics, they show thermal induction of flowering to have a unique genetic basis. Genomic responses to temperature and light during floral induction differ, and temperature-specific changes include alterations in RNA processing.
Keyword Genetics & Heredity
MADS-box gene
LOCUS-C
Circadian clock
Molecular-basis
Salicylic-acid
Reproductive development
Natural variation
Floral induction
Time-variation
Messenger-RNA
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Article no. e106 pp.0980-0989

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
ERA 2012 Admin Only
School of Biomedical Sciences Publications
 
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Created: Fri, 25 Jan 2008, 16:54:53 EST