biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 53:484-492, 2009 | DOI: 10.1007/s10535-009-0089-9

Regulation of the ALBINO3-mediated transition to flowering in Arabidopsis depends on the expression of CO and GA1

A. X. Wang1, D. Y. Wang2,3,*
1 College of Horticulture, Northeast Agricultural University, Harbin, China
2 Key Laboratory of Developmental Genes and Human Disease in Ministry of Education, Southeast University, Nanjing, China
3 Department of Genetics and Developmental Biology, Southeast University, Nanjing, China

ALBINO3, a homologue of PPF1 in Arabidopsis, encodes a chloroplast protein, and is essential for chloroplast differentiation. In the present study, ALBINO3(-) transgenic plants exhibited a significant decrease in both the number of rosette leaves at bolting and the days before bolting, suggesting the important roles of ALBINO3 in regulating flowering during non-inductive short-day photoperiods. ALBINO3 mRNA was apparently accumulated in shoot apical meristem and floral meristems around the shoot apical meristem in wild-type plants. ALBINO3 might be predominantly involved in inducing the floral repression pathway by activating the expression of TFL1, and by suppressing the expression of LFY, respectively, in the shoot apical meristem. Moreover, the function of ALBINO3 in regulating flowering transition depended on the expression of CO and GA1, because ALBINO3 might function in the downstream integration of the photoperiod-dependent and the photoperiod-independent pathways. These results suggest that ALBINO3 may have an important integrative function in the flowering process in Arabidopsis.

Keywords: LFY; photoperiod; shoot apical meristem; TFL1
Subjects: apical meristem; Arabidopsis thaliana; chloroplast; flowering; flowering-related genes; gene expression; photoperid; polymerase chain reaction (PCR); transgenic plants

Received: October 30, 2007; Accepted: May 2, 2008; Published: September 1, 2009  Show citation

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Wang, A.X., & Wang, D.Y. (2009). Regulation of the ALBINO3-mediated transition to flowering in Arabidopsis depends on the expression of CO and GA1. Biologia plantarum, 53(3), 484-492. doi: 10.1007/s10535-009-0089-9
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