Journal
MOLECULAR PLANT
Volume 5, Issue 3, Pages 678-687Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mp/sss005
Keywords
microarray; LHY; endogenous clock; GI; ELF4
Categories
Funding
- National Research Foundation of Korea (NRF)
- Korea government (MEST) [20100020417]
- National Core Research Center [2009-0091504]
- World Class University [R31-2008-000-10105-0]
- National Institute of Health [R01GM093285]
- National Research Foundation of Korea [2010-0020417] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The endogenous circadian clock regulates many physiological processes related to plant survival and adaptability. GIGANTEA (GI), a clock-associated protein, contributes to the maintenance of circadian period length and amplitude, and also regulates flowering time and hypocotyl growth in response to day length. Similarly, EARLY FLOWERING 4 (ELF4), another clock regulator, also contributes to these processes. However, little is known about either the genetic or molecular interactions between Gland ELF4 in Arabidopsis. In this study, we investigated the genetic interactions between Gland ELF4 in the regulation of circadian clock-controlled outputs. Our mutant analysis shows that GI is epistatic to ELF4 in flowering time determination, while ELF4 is epistatic to GI in hypocotyl growth regulation. Moreover, GI and ELF4 have a synergistic or additive effect on endogenous clock regulation. Gene expression profiling of gi, elf4, and gi elf4 mutants further established that Gland ELF4 have differentially dominant influences on circadian physiological outputs at dusk and dawn, respectively. This phasing of Gland ELF4 influences provides a potential means to achieve diversity in the regulation of circadian physiological outputs, including flowering time and hypocotyl growth.
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