This Article Full Text Full Text (PDF) Supplemental Data All Versions of this Article: 20/2/307    most recent tpc.107.055715v1 Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Kim, J. Articles by Nam, H. G. Search for Related Content PubMed PubMed Citation Articles by Kim, J. Articles by Nam, H. G. Agricola Articles by Kim, J. Articles by Nam, H. G.

FIONA1 Is Essential for Regulating Period Length in the Arabidopsis Circadian Clock^[W]

^a Division of Molecular and Life Sciences, Pohang University of Science and Technology, Hyoja-dong, Pohang, Gyungbuk 790-784, Republic of Korea
^b School of Interdisciplinary Biosciences and Bioengineering, Pohang University of Science and Technology, Hyoja-dong, Pohang, Gyungbuk 790-784, Republic of Korea

¹ Address correspondence to nam{at}postech.ac.kr.

In plants, the circadian clock controls daily physiological cycles as well as daylength-dependent developmental processes such as photoperiodic flowering and seedling growth. Here, we report that FIONA1 (FIO1) is a genetic regulator of period length in the Arabidopsis thaliana circadian clock. FIO1 was identified by screening for a mutation in daylength-dependent flowering. The mutation designated fio1-1 also affects daylength-dependent seedling growth. fio1-1 causes lengthening of the free-running circadian period of leaf movement and the transcription of various genes, including the central oscillators CIRCADIAN CLOCK-ASSOCIATED1, LATE ELONGATED HYPOCOTYL, TIMING OF CAB EXPRESSION1, and LUX ARRHYTHMO. However, period lengthening is not dependent upon environmental light or temperature conditions, which suggests that FIO1 is not a simple input component of the circadian system. Interestingly, fio1-1 exerts a clear effect on the period length of circadian rhythm but has little effect on its amplitude and robustness. FIO1 encodes a novel nuclear protein that is highly conserved throughout the kingdoms. We propose that FIO1 regulates period length in the Arabidopsis circadian clock in a close association with the central oscillator and that the circadian period can be controlled separately from amplitude and robustness.

This article has been cited by other articles:

				J. Mach Newly Isolated Circadian Clock Components Conserved across Eukaryotes PLANT CELL, May 1, 2008; 20(5): 1187 - 1187. [Full Text] [PDF]