| Abstract Detail
Growth and Vegetative Development Wang, Ying [1], Wu, Jing-Fen [2], Wu, Shu-Hsing [2]. LWD1 and LWD2, two new players in Arabidopsis leaf morphogenesis and photoperiod regulation. “Light” is one important environmental stimulus for plants. The proper light signaling enables plants to develop properly. We are interested in understanding what genes are regulated by light and how they function underlying the morphogenesis process in plants. LWD1 (Light-regulated WD repeats protein 1) is one of the light-responsive genes from our transcriptomic analyses. The expression of LWD1 is induced by light during photomorphogenesis and ubiquitously expressed throughout the life cycle. LWD1 and LWD2 (Light-regulated WD repeats protein 2) share ~90% identity in amino acid sequence and both contain five WD repeats -- a domain often serves as protein-protein interaction platform in recruiting or assembling signaling complexes. The approach of reverse genetics was also used to characterize the functions of LWD1 and LWD2 in Arabidopsis. The lwd1 or lwd2 single mutant did not present obvious phenotype alterations, indicating these two proteins have functional redundancy. However, lwd1lwd2 double mutant has more serrate and down-curling leaves. Early-flowering phenotype was also observed for lwd1lwd2 plants under both long-day (LD) and short-day (SD) conditions. Consistent with this finding, the expression of circadian-regulated genes (eg. CIRCADIAN ASSOCIATED 1, CCA1), which control flowering initiation in response to day length, were differentially regulated in lwd1lwd2 double mutant. We hypothesize that LWD1/LWD2 proteins might function in transmit the external light signals to regulate the circadian clock. Taken together, LWD1 and LWD2 are required for the flowering time control and proper leaf morphogenesis.
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1 - Institute of Plant and Microbial Biology, Rm 402, Academia Sinica, 128, Sec. 2, Academia Road, Nankang, Taipei, 11529, Taiwan, ROC
2 - Institute of Plant and Microbial Biology, Rm 402, Academia Sinica
Keywords:
light
circadian.
Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P26037
Abstract ID:1107 |
